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UniProtKB - O35426 (XBP1_MOUSE)

Entry version 163 (22 Apr 2020)
Sequence version 2 (01 Jun 2001)
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Protein

X-box-binding protein 1

Gene

Xbp1

Organism
Mus musculus (Mouse)
Status
Reviewed-Annotation score:

Annotation score:5 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>-Experimental evidence at protein leveli <p>This indicates the type of evidence that supports the existence of the protein. Note that the 'protein existence' evidence does not give information on the accuracy or correctness of the sequence(s) displayed.<p><a href='/help/protein_existence' target='_top'>More...</a></p>

<p>This section provides any useful information about the protein, mostly biological knowledge.<p><a href='/help/function_section' target='_top'>More...</a></p>Functioni

Functions as a transcription factor during endoplasmic reticulum stress by regulating the unfolded protein response (UPR). Required for cardiac myogenesis and hepatogenesis during embryonic development and the development of secretory tissues such as exocrine pancreas and salivary gland (PubMed:10425189, PubMed:10652269, PubMed:16362047, PubMed:17612490). Involved in differentiation of B lymphocytes to plasma cells and production of immunoglobulins. Modulates the cellular response to ER stress in a PIK3R-dependent manner. Binds to the cis-acting X box present in the promoter regions of major histocompatibility complex class II genes (By similarity). Involved in VEGF-induced endothelial cell (EC) proliferation and retinal blood vessel formation during embryonic development but also for angiogenesis in adult tissues under ischemic conditions (PubMed:23529610). Functions also as a major regulator of the UPR in obesity-induced insulin resistance and type 2 diabetes for the management of obesity and diabetes prevention (PubMed:15486293).By similarity6 Publications
Plays a role in the unconventional cytoplasmic splicing processing of its own mRNA triggered by the endoplasmic reticulum (ER) transmembrane endoribonuclease ENR1: upon ER stress, the emerging XBP1 polypeptide chain, as part of a mRNA-ribosome-nascent chain (R-RNC) complex, cotranslationally recruits its own unprocessed mRNA through transient docking to the ER membrane and translational pausing, therefore facilitating efficient IRE1-mediated XBP1 mRNA isoform 2 production. In endothelial cells (EC), associated with KDR, promotes IRE1-mediated XBP1 mRNA isoform 2 production in a vascular endothelial growth factor (VEGF)-dependent manner, leading to EC proliferation and angiogenesis (By similarity). Functions as a negative feed-back regulator of the potent transcription factor XBP1 isoform 2 protein levels through proteasome-mediated degradation, thus preventing the constitutive activation of the ER stress response signaling pathway (PubMed:16332684). Inhibits the transactivation activity of XBP1 isoform 2 in myeloma cells (PubMed:12902539). Acts as a weak transcriptional factor. Together with HDAC3, contributes to the activation of NFE2L2-mediated HMOX1 transcription factor gene expression in a PI3K/mTORC2/Akt-dependent signaling pathway leading to EC survival under disturbed flow/oxidative stress. Binds to the ER stress response element (ERSE) upon ER stress. Binds to the consensus 5'-GATGACGTG[TG]N3[AT]T-3' sequence related to cAMP responsive element (CRE)-like sequences. Binds the Tax-responsive element (TRE) present in the long terminal repeat (LTR) of T-cell leukemia virus type 1 (HTLV-I) and to the TPA response elements (TRE). Associates preferentially to the HDAC3 gene promoter region in a static flow-dependent manner. Binds to the CDH5/VE-cadherin gene promoter region (By similarity).By similarity2 Publications
Functions as a stress-inducible potent transcriptional activator during endoplasmic reticulum (ER) stress by inducing unfolded protein response (UPR) target genes via binding to the UPR element (UPRE). Up-regulates target genes encoding ER chaperones and ER-associated degradation (ERAD) components to enhance the capacity of productive folding and degradation mechanism, respectively, in order to maintain the homeostasis of the ER under ER stress (PubMed:11850408, PubMed:14559994). Plays a role in the production of immunoglobulins and interleukin-6 in the presence of stimuli required for plasma cell differentiation, and promotes as well membrane phospholipid biosynthesis necessary for ER expansion (PubMed:12612580, PubMed:17213183). Contributes to the VEGF-induced endothelial cell (EC) growth and proliferation in a Akt/GSK-dependent and/or -independent signaling pathway, respectively, leading to beta-catenin nuclear translocation and E2F2 gene expression. Promotes umbilical vein EC apoptosis and atherosclerotisis development in a caspase-dependent signaling pathway, and contributes to VEGF-induced EC proliferation and angiogenesis in adult tissues under ischemic conditions. Involved in the regulation of endostatin-induced autophagy in EC through BECN1 transcriptional activation. Plays a role as an oncogene by promoting tumor progression: stimulates zinc finger protein SNAI1 transcription to induce epithelial-to-mesenchymal (EMT) transition, cell migration and invasion of breast cancer cells (By similarity). Involved in adipocyte differentiation by regulating lipogenic gene expression during lactation (PubMed:23623498, PubMed:25223794). Plays a role in the survival of both dopaminergic neurons of the substantia nigra pars compacta (SNpc), by maintaining protein homeostasis and of myeloma cells (PubMed:12902539, PubMed:24753614). Increases insulin sensitivity in the liver as a response to a high carbohydrate diet, resulting in improved glucose tolerance (PubMed:20348926). Improves also glucose homeostasis in an ER stress- and/or insulin-independent manner through both binding and proteasome-induced degradation of the transcription factor FOXO1, hence resulting in suppression of gluconeogenic genes expression and in a reduction of blood glucose levels (PubMed:21317886). Controls the induction of de novo fatty acid synthesis in hepatocytes by regulating the expression of a subset of lipogenic genes in an ER stress- and UPR-independent manner (PubMed:18556558). Binds to the 5'-CCACG-3' motif in the PPARG promoter (PubMed:25223794). Associates preferentially to the HDAC3 gene promoter region in a disturbed flow-dependent manner. Binds to the BECN1 gene promoter region. Binds to the CDH5/VE-cadherin gene promoter region. Binds to the ER stress response element (ERSE) upon ER stress (By similarity).By similarity11 Publications

<p>The <a href="http://www.geneontology.org/">Gene Ontology (GO)</a> project provides a set of hierarchical controlled vocabulary split into 3 categories:<p><a href='/help/gene_ontology' target='_top'>More...</a></p>GO - Molecular functioni

Complete GO annotation on QuickGO ...

GO - Biological processi

Complete GO annotation on QuickGO ...

<p>UniProtKB Keywords constitute a <a href="http://www.uniprot.org/keywords">controlled vocabulary</a> with a hierarchical structure. Keywords summarise the content of a UniProtKB entry and facilitate the search for proteins of interest.<p><a href='/help/keywords' target='_top'>More...</a></p>Keywordsi

Molecular functionActivator, Developmental protein, DNA-binding
Biological processAngiogenesis, Apoptosis, Autophagy, Differentiation, Lipid biosynthesis, Lipid metabolism, Myogenesis, Protein transport, Stress response, Transcription, Transcription regulation, Transport, Unfolded protein response

<p>This section provides information about the protein and gene name(s) and synonym(s) and about the organism that is the source of the protein sequence.<p><a href='/help/names_and_taxonomy_section' target='_top'>More...</a></p>Names & Taxonomyi

<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section provides an exhaustive list of all names of the protein, from commonly used to obsolete, to allow unambiguous identification of a protein.<p><a href='/help/protein_names' target='_top'>More...</a></p>Protein namesi
Recommended name:
X-box-binding protein 1By similarityImported
Short name:
XBP-1By similarity
Alternative name(s):
Tax-responsive element-binding protein 51 Publication
Short name:
TREB-5Curated
Cleaved into the following 2 chains:
X-box-binding protein 1, cytoplasmic formBy similarity
X-box-binding protein 1, luminal formBy similarity
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section indicates the name(s) of the gene(s) that code for the protein sequence(s) described in the entry. Four distinct tokens exist: 'Name', 'Synonyms', 'Ordered locus names' and 'ORF names'.<p><a href='/help/gene_name' target='_top'>More...</a></p>Gene namesi
Name:Xbp1By similarityImported
Synonyms:Treb51 Publication
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section provides information on the name(s) of the organism that is the source of the protein sequence.<p><a href='/help/organism-name' target='_top'>More...</a></p>OrganismiMus musculus (Mouse)
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section shows the unique identifier assigned by the NCBI to the source organism of the protein. This is known as the 'taxonomic identifier' or 'taxid'.<p><a href='/help/taxonomic_identifier' target='_top'>More...</a></p>Taxonomic identifieri10090 [NCBI]
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section contains the taxonomic hierarchical classification lineage of the source organism. It lists the nodes as they appear top-down in the taxonomic tree, with the more general grouping listed first.<p><a href='/help/taxonomic_lineage' target='_top'>More...</a></p>Taxonomic lineageiEukaryota › Metazoa › Chordata › Craniata › Vertebrata › Euteleostomi › Mammalia › Eutheria › Euarchontoglires › Glires › Rodentia › Myomorpha › Muroidea › Muridae › Murinae › Mus › Mus
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section is present for entries that are part of a <a href="http://www.uniprot.org/proteomes">proteome</a>, i.e. of a set of proteins thought to be expressed by organisms whose genomes have been completely sequenced.<p><a href='/help/proteomes_manual' target='_top'>More...</a></p>Proteomesi
  • UP000000589 <p>A UniProt <a href="http://www.uniprot.org/manual/proteomes%5Fmanual">proteome</a> can consist of several components.<br></br>The component name refers to the genomic component encoding a set of proteins.<p><a href='/help/proteome_component' target='_top'>More...</a></p> Componenti: Chromosome 11

Organism-specific databases

Mouse genome database (MGD) from Mouse Genome Informatics (MGI)

More...MGIi		MGI:98970 Xbp1

<p>This section provides information on the location and the topology of the mature protein in the cell.<p><a href='/help/subcellular_location_section' target='_top'>More...</a></p>Subcellular locationi

Extracellular region or secreted Cytosol Plasma membrane Cytoskeleton Lysosome Endosome Peroxisome ER Golgi apparatus Nucleus Mitochondrion Manual annotation Automatic computational assertionGraphics by Christian Stolte & Seán O’Donoghue; Source: COMPARTMENTS

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/subcellular%5Flocation%5Fsection">'Subcellular location'</a> section describes the subcellular compartment where each non-membrane region of a membrane-spanning protein is found.<p><a href='/help/topo_dom' target='_top'>More...</a></p>Topological domaini1 – 180CytoplasmicBy similarityAdd BLAST180
<p>This subsection of the <a href="http://www.uniprot.org/help/subcellular%5Flocation%5Fsection">'Subcellular location'</a> section describes the extent of a membrane-spanning region of the protein. It denotes the presence of both alpha-helical transmembrane regions and the membrane spanning regions of beta-barrel transmembrane proteins.<p><a href='/help/transmem' target='_top'>More...</a></p>Transmembranei181 – 198Helical; Signal-anchor for type II membrane proteinSequence analysisBy similarityAdd BLAST18
Topological domaini199 – 267LumenalBy similarityAdd BLAST69

Keywords - Cellular componenti

Cytoplasm, Endoplasmic reticulum, Membrane, Nucleus

<p>This section provides information on the disease(s) and phenotype(s) associated with a protein.<p><a href='/help/pathology_and_biotech_section' target='_top'>More...</a></p>Pathology & Biotechi

<p>This subsection of the 'Pathology and Biotech' section describes the in vivo effects caused by ablation of the gene (or one or more transcripts) coding for the protein described in the entry. This includes gene knockout and knockdown, provided experiments have been performed in the context of a whole organism or a specific tissue, and not at the single-cell level.<p><a href='/help/disruption_phenotype' target='_top'>More...</a></p>Disruption phenotypei

Mice embryos die at 12.5-13.5 dpc and display less blood vessels (PubMed:23529610). Embryos display hypoplastic livers, cellular necrosis in the myocardium, hypoplasia of the heart and die in utero from severe anemia (PubMed:10425189, PubMed:10652269). Mice display severe abnormalities in the development and function of secretory cells, such as plasma B cells and pancreatic acinar cells (PubMed:16362047). Haploinsufficient mice fed a high-fat diet gain more weight, display enhanced ER stress in adipose tissue, reduced insulin receptor signaling and develop peripheral insulin resistance and type 2 diabetes (PubMed:15486293). Endothelial-specific knockout mice show delayed retinal vascular development and impaired postischemic angiogenesis (PubMed:23529610, PubMed:23184933). Dopaminergic neuron-specific knockout mice display ER dysfonction and accumulation of abnormal protein aggregates (PubMed:24753614). Liver-specific knockout mice leads to reduced lipogenic gene expression and diminished hepatic lipid synthesis (PubMed:18556558). Adipocyte-specific knockout female mice fed with a regular or high-fat diet, show no alteration in body weight, adipose tissue mass, blood glucose, serum insulin and lipid levels; however during lactation adipose tissue mass increases and milk production decreases but mammary gland structure and milk composition remains normal (PubMed:23623498). Intestinal epithelial cell-specific knockout mice born and developed normally but displayed small intestinal mucosal inflammation in association with increased ER stress, a diminution of Paneth and goblet cells with reduced secretory granules (PubMed:18775308).10 Publications

Mutagenesis

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/manual/pathology%5Fand%5Fbiotech%5Fsection">'Pathology and Biotech'</a> section describes the effect of the experimental mutation of one or more amino acid(s) on the biological properties of the protein.<p><a href='/help/mutagen' target='_top'>More...</a></p>Mutagenesisi177 – 178PP → LH: Reduces degradation (isoform 1); when associated with 238-L-H-239. 1 Publication2
Mutagenesisi231K → R: Enhances stability and accumulates in the cytoplasm; when associated with R-252 (isoform 1). 2 Publications1
Mutagenesisi238 – 239PP → LH: Reduces degradation (isoform 1); when associated with 177-L-H-178. 1 Publication2
Mutagenesisi252K → R: Enhances stability and accumulates in the cytoplasm; when associated with R-231 (isoform 1). 2 Publications1

<p>This section describes post-translational modifications (PTMs) and/or processing events.<p><a href='/help/ptm_processing_section' target='_top'>More...</a></p>PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'PTM / Processing' section describes the extent of a polypeptide chain in the mature protein following processing or proteolytic cleavage.<p><a href='/help/chain' target='_top'>More...</a></p>ChainiPRO_00000765441 – 267X-box-binding protein 1Add BLAST267
ChainiPRO_00004318931 – 188X-box-binding protein 1, cytoplasmic formBy similarityAdd BLAST188
ChainiPRO_0000431894191 – 267X-box-binding protein 1, luminal formBy similarityAdd BLAST77

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'PTM / Processing' section specifies the position and type of each modified residue excluding <a href="http://www.uniprot.org/manual/lipid">lipids</a>, <a href="http://www.uniprot.org/manual/carbohyd">glycans</a> and <a href="http://www.uniprot.org/manual/crosslnk">protein cross-links</a>.<p><a href='/help/mod_res' target='_top'>More...</a></p>Modified residuei61PhosphoserineBy similarity1

<p>This subsection of the <a href="http://www.uniprot.org/help/ptm%5Fprocessing%5Fsection">PTM/processing</a> section describes post-translational modifications (PTMs). This subsection <strong>complements</strong> the information provided at the sequence level or describes modifications for which <strong>position-specific data is not yet available</strong>.<p><a href='/help/post-translational_modification' target='_top'>More...</a></p>Post-translational modificationi

Acetylated by EP300; acetylation positively regulates the transcriptional activity of XBP1 isoform 2 (PubMed:20955178). Isoform 2 is deacetylated by SIRT1; deacetylation negatively regulates the transcriptional activity of XBP1 isoform 2 (PubMed:20955178).1 Publication1 Publication
Ubiquitinated, leading to proteasomal degradation in response to ER stress (PubMed:11780124, PubMed:12902539, PubMed:16332684).By similarity3 Publications
X-box-binding protein 1, cytoplasmic form and luminal form are produced by intramembrane proteolytic cleavage of ER membrane-anchored isoform 1 triggered by HM13/SPP in a DERL1-RNF139-dependent and VCP/p97-independent manner. X-box-binding protein 1, luminal form is ubiquitinated leading to proteasomal degradation (By similarity).By similarity

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection describes interesting single amino acid sites on the sequence that are not defined in any other subsection. This subsection can be displayed in different sections ('Function', 'PTM / Processing', 'Pathology and Biotech') according to its content.<p><a href='/help/site' target='_top'>More...</a></p>Sitei185 – 186Cleavage; by HM13/SPPBy similarity2

Keywords - PTMi

Acetylation, Cleavage on pair of basic residues, Phosphoprotein, Ubl conjugation

Proteomic databases

PaxDb, a database of protein abundance averages across all three domains of life

More...PaxDbi		O35426

PRoteomics IDEntifications database

More...PRIDEi		O35426

PTM databases

iPTMnet integrated resource for PTMs in systems biology context

More...iPTMneti		O35426

Comprehensive resource for the study of protein post-translational modifications (PTMs) in human, mouse and rat.

More...PhosphoSitePlusi		O35426

<p>This section provides information on the expression of a gene at the mRNA or protein level in cells or in tissues of multicellular organisms.<p><a href='/help/expression_section' target='_top'>More...</a></p>Expressioni

<p>This subsection of the 'Expression' section provides information on the expression of a gene at the mRNA or protein level in cells or in tissues of multicellular organisms. By default, the information is derived from experiments at the mRNA level, unless specified 'at protein level'.<br></br>Examples: <a href="http://www.uniprot.org/uniprot/P92958#expression">P92958</a>, <a href="http://www.uniprot.org/uniprot/Q8TDN4#expression">Q8TDN4</a>, <a href="http://www.uniprot.org/uniprot/O14734#expression">O14734</a><p><a href='/help/tissue_specificity' target='_top'>More...</a></p>Tissue specificityi

Isoform 1 and isoform 2 are expressed at higher level in branch curves of vessel walls and in atherosclerotic plaques relative to healthy segments of the same aortas (at protein level) (PubMed:19416856). Expressed in skeletal muscles, plasma cells and pancreatic beta cells (PubMed:17612490). Isoform 1 and isoform 2 are expressed in gonadal adipose tissue. Isoform 1 is expressed in inguinal adipose tissue (PubMed:23623498).3 Publications

<p>This subsection of the 'Expression' section provides information on the expression of the gene product at various stages of a cell, tissue or organism development. By default, the information is derived from experiments at the mRNA level, unless specified 'at the protein level'.<p><a href='/help/developmental_stage' target='_top'>More...</a></p>Developmental stagei

Expressed mainly in exocrine glands and bone precursors in the embryonic mouse (PubMed:7693055).1 Publication

<p>This subsection of the 'Expression' section reports the experimentally proven effects of inducers and repressors (usually chemical compounds or environmental factors) on the level of protein (or mRNA) expression (up-regulation, down-regulation, constitutive expression).<p><a href='/help/induction' target='_top'>More...</a></p>Inductioni

Isoform 2 is up-regulated during adipocyte differentiation (PubMed:25223794). Isoform 2 is up-regulated upon refeeding after a fasting period in liver and in ob/ob mice (obese) (at protein level) (PubMed:20348926). Induced by chemical activators of the unfolded protein response (UPR) such as tunicamycin, DTT and thapsigargin (PubMed:17612490). Up-regulated after partial hepatectomy during the acute phase response (PubMed:10652269). Isoform 1 and isoform 2 are up-regulated by interleukin-4 in B cells in a STAT6-dependent manner (PubMed:12612580). Isoform 1 and isoform 2 are up-regulated during lactation and by the lactogenic hormone prolactin (PubMed:23623498). Isoform 2 is up-regulated by prolonged feeding of high-carbohydrate diets in hepatocytes in absence of ER-stress (PubMed:18556558). Isoform 2 is up-regulated by insulin-like growth factor and glucose starvation (PubMed:17612490). Isoform 2 is up-regulated during plasma-cell differentiation in response to endoplasmic reticulum (ER) stress, such as lipopolysaccharide (LPS) (PubMed:11780124, PubMed:11850408, PubMed:12612580).9 Publications

Gene expression databases

Bgee dataBase for Gene Expression Evolution

More...Bgeei		ENSMUSG00000020484 Expressed in lacrimal gland and 307 other tissues

ExpressionAtlas, Differential and Baseline Expression

More...ExpressionAtlasi		O35426 baseline and differential

Genevisible search portal to normalized and curated expression data from Genevestigator

More...Genevisiblei		O35426 MM

<p>This section provides information on the quaternary structure of a protein and on interaction(s) with other proteins or protein complexes.<p><a href='/help/interaction_section' target='_top'>More...</a></p>Interactioni

<p>This subsection of the <a href="http://www.uniprot.org/help/interaction%5Fsection">'Interaction'</a> section provides information about the protein quaternary structure and interaction(s) with other proteins or protein complexes (with the exception of physiological receptor-ligand interactions which are annotated in the <a href="http://www.uniprot.org/help/function%5Fsection">'Function'</a> section).<p><a href='/help/subunit_structure' target='_top'>More...</a></p>Subunit structurei

Isoform 1 interacts with HM13.

Isoform 1 interacts with RNF139; the interaction induces ubiquitination and degradation of isoform 1. Isoform 1 interacts (via luminal domain) with DERL1; the interaction obviates the need for ectodomain shedding prior HM13/SPP-mediated XBP1 isoform 1 cleavage.

Isoform 1 interacts with isoform 2; the interaction sequesters isoform 2 from the nucleus and enhances isoform 2 degradation in the cytoplasm.

Isoform 1 interacts with HDAC3 and AKT1; the interactions occur in endothelial cell (EC) under disturbed flow.

Isoform 1 interacts with the oncoprotein FOS.

Isoform 2 interacts with ATF6; the interaction occurs in a ER stress-dependent manner and is required for DNA binding to the unfolded protein response element (UPRE).

Isoform 2 interacts with PIK3R1; the interaction is direct and induces translocation of XBP1 isoform 2 into the nucleus and the unfolded protein response (UPR) XBP1-dependent target genes activation in a ER stress- and/or insulin-dependent but PI3K-independent manner (By similarity).

Isoform 2 interacts with SIRT1 (PubMed:20955178).

Isoform 2 interacts with PIK3R1 and PIK3R2; the interactions are direct and induce translocation of XBP1 isoform 2 into the nucleus and the unfolded protein response (UPR) XBP1-dependent target genes activation in a ER stress- and/or insulin-dependent but PI3K-independent manner (PubMed:20348926).

Isoform 2 interacts with FOXO1; the interaction is direct and leads to FOXO1 ubiquitination and degradation via the proteasome pathway in hepatocytes (PubMed:21317886).

By similarity3 Publications

GO - Molecular functioni

Complete GO annotation on QuickGO ...

Protein-protein interaction databases

The Biological General Repository for Interaction Datasets (BioGrid)

More...BioGridi		204589, 3 interactors

STRING: functional protein association networks

More...STRINGi		10090.ENSMUSP00000054852

Miscellaneous databases

RNAct, Protein-RNA interaction predictions for model organisms.

More...RNActi		O35426 protein

<p>This section provides information on the tertiary and secondary structure of a protein.<p><a href='/help/structure_section' target='_top'>More...</a></p>Structurei

3D structure databases

SWISS-MODEL Repository - a database of annotated 3D protein structure models

More...SMRi		O35426

Database of comparative protein structure models

More...ModBasei		Search...

<p>This section provides information on sequence similarities with other proteins and the domain(s) present in a protein.<p><a href='/help/family_and_domains_section' target='_top'>More...</a></p>Family & Domainsi

Domains and Repeats

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/family%5Fand%5Fdomains%5Fsection">Family and Domains</a> section describes the position and type of a domain, which is defined as a specific combination of secondary structures organized into a characteristic three-dimensional structure or fold.<p><a href='/help/domain' target='_top'>More...</a></p>Domaini63 – 126bZIPPROSITE-ProRule annotationAdd BLAST64

Region

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'Family and Domains' section describes a region of interest that cannot be described in other subsections.<p><a href='/help/region' target='_top'>More...</a></p>Regioni65 – 87Basic motifPROSITE-ProRule annotationAdd BLAST23
Regioni69 – 85Nuclear localization signal (NLS); in isoforms 1 and isoform 2By similarityAdd BLAST17
Regioni91 – 126Leucine-zipperPROSITE-ProRule annotationAdd BLAST36
Regioni230 – 256Necessary for the translational pausing of its own mRNABy similarityAdd BLAST27

<p>This subsection of the 'Family and domains' section provides general information on the biological role of a domain. The term 'domain' is intended here in its wide acceptation, it may be a structural domain, a transmembrane region or a functional domain. Several domains are described in this subsection.<p><a href='/help/domain_cc' target='_top'>More...</a></p>Domaini

Isoform 1 transmembrane signal-anchor domain is necessary for its own mRNA to be recruited to the endoplasmic reticulum (ER) which will undergo unconventional ERN1-dependent splicing in response to ER stress. Isoform 1 N-terminus and C-terminus regions are necessary for DNA-binding and weak transcriptional activity, respectively. Isoform 2 N-terminus and C-terminus regions are necessary for DNA-binding and strong transcriptional activity upon ER stress, respectively. Isoform 2 C-terminus region contains a nuclear exclusion signal (NES) at positions 182 through 204. Isoform 2 C-terminus region contains a degradation domain at positions 204 through 256 (By similarity). Isoform 1 and isoform 2 N-terminus domains are necessary for nuclear localization targeting. Isoform 1 C-terminus domain confers localization to the cytoplasm and is sufficient to impose rapid degradation (PubMed:16332684).By similarity1 Publication

<p>This subsection of the 'Family and domains' section provides information about the sequence similarity with other proteins.<p><a href='/help/sequence_similarities' target='_top'>More...</a></p>Sequence similaritiesi

Belongs to the bZIP family.Curated

Keywords - Domaini

Signal-anchor, Transmembrane, Transmembrane helix

Phylogenomic databases

evolutionary genealogy of genes: Non-supervised Orthologous Groups

More...eggNOGi		KOG4005 Eukaryota
ENOG410XSJI LUCA

Ensembl GeneTree

More...GeneTreei		ENSGT00390000017751

The HOGENOM Database of Homologous Genes from Fully Sequenced Organisms

More...HOGENOMi		CLU_093516_0_0_1

InParanoid: Eukaryotic Ortholog Groups

More...InParanoidi		O35426

KEGG Orthology (KO)

More...KOi		K09027

Identification of Orthologs from Complete Genome Data

More...OMAi		NQELRCR

Database of Orthologous Groups

More...OrthoDBi		1269901at2759

TreeFam database of animal gene trees

More...TreeFami		TF319837

Family and domain databases

Integrated resource of protein families, domains and functional sites

More...InterProi		View protein in InterPro
IPR004827 bZIP

Pfam protein domain database

More...Pfami		View protein in Pfam
PF07716 bZIP_2, 1 hit

Simple Modular Architecture Research Tool; a protein domain database

More...SMARTi		View protein in SMART
SM00338 BRLZ, 1 hit

PROSITE; a protein domain and family database

More...PROSITEi		View protein in PROSITE
PS50217 BZIP, 1 hit
PS00036 BZIP_BASIC, 1 hit

<p>This section displays by default the canonical protein sequence and upon request all isoforms described in the entry. It also includes information pertinent to the sequence(s), including <a href="http://www.uniprot.org/help/sequence%5Flength">length</a> and <a href="http://www.uniprot.org/help/sequences">molecular weight</a>. The information is filed in different subsections. The current subsections and their content are listed below:<p><a href='/help/sequences_section' target='_top'>More...</a></p>Sequences (2+)i

<p>This subsection of the <a href="http://www.uniprot.org/help/sequences%5Fsection">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical%5Fand%5Fisoforms">canonical sequence</a> displayed by default in the entry is complete or not.<p><a href='/help/sequence_status' target='_top'>More...</a></p>Sequence statusi: Complete.

<p>This subsection of the <a href="http://www.uniprot.org/help/sequences%5Fsection">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical%5Fand%5Fisoforms">canonical sequence</a> displayed by default in the entry is in its mature form or if it represents the precursor.<p><a href='/help/sequence_processing' target='_top'>More...</a></p>Sequence processingi: The displayed sequence is further processed into a mature form.

This entry describes 2 <p>This subsection of the 'Sequence' section lists the alternative protein sequences (isoforms) that can be generated from the same gene by a single or by the combination of up to four biological events (alternative promoter usage, alternative splicing, alternative initiation and ribosomal frameshifting). Additionally, this section gives relevant information on each alternative protein isoform. This section is only present in reviewed entries, i.e. in UniProtKB/Swiss-Prot.<p><a href='/help/alternative_products' target='_top'>More...</a></p> isoformsi produced by alternative splicing. AlignAdd to basket

This entry has 2 described isoforms and 3 potential isoforms that are computationally mapped.Show allAlign All

Isoform 1 (identifier: O35426-1) [UniParc]FASTAAdd to basket
Also known as: Unprocessed XBP-1, XBP-1U1 Publication

This isoform has been chosen as the <div> <p><b>What is the canonical sequence?</b><p><a href='/help/canonical_and_isoforms' target='_top'>More...</a></p>canonicali sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry.

« Hide
        10         20         30         40         50
MVVVAAAPSA ATAAPKVLLL SGQPASGGRA LPLMVPGPRA AGSEASGTPQ 
        60         70         80         90        100
ARKRQRLTHL SPEEKALRRK LKNRVAAQTA RDRKKARMSE LEQQVVDLEE 
       110        120        130        140        150
ENHKLQLENQ LLREKTHGLV VENQELRTRL GMDTLDPDEV PEVEAKGSGV 
       160        170        180        190        200
RLVAGSAESA ALRLCAPLQQ VQAQLSPPQN IFPWTLTLLP LQILSLISFW 
       210        220        230        240        250
AFWTSWTLSC FSNVLPQSLL VWRNSQRSTQ KDLVPYQPPF LCQWGPHQPS 
       260 
WKPLMNSFVL TMYTPSL
Length:267
Mass (Da):29,619
Last modified:June 1, 2001 - v2
<p>The checksum is a form of redundancy check that is calculated from the sequence. It is useful for tracking sequence updates.</p> <p>It should be noted that while, in theory, two different sequences could have the same checksum value, the likelihood that this would happen is extremely low.</p> <p>However UniProtKB may contain entries with identical sequences in case of multiple genes (paralogs).</p> <p>The checksum is computed as the sequence 64-bit Cyclic Redundancy Check value (CRC64) using the generator polynomial: x<sup>64</sup> + x<sup>4</sup> + x<sup>3</sup> + x + 1. The algorithm is described in the ISO 3309 standard. </p> <p class="publication">Press W.H., Flannery B.P., Teukolsky S.A. and Vetterling W.T.<br /> <strong>Cyclic redundancy and other checksums</strong><br /> <a href="http://www.nrbook.com/b/bookcpdf.php">Numerical recipes in C 2nd ed., pp896-902, Cambridge University Press (1993)</a>)</p> Checksum:i15009E684F6D426F
GO
Isoform 2 (identifier: O35426-2) [UniParc]FASTAAdd to basket
Also known as: Processed XBP-1, XBP-1S1 Publication

The sequence of this isoform differs from the canonical sequence as follows:
     162-267: LRLCAPLQQV...FVLTMYTPSL → GAGPVVTSPE...NELFPQLISV

Note: Potent transcriptional activator. Induced by unconventional ERN1-dependent splicing in response to endoplasmic reticulum stress. ENR1 cleaves a 26-bp fragment causing a frameshift of the mRNA transcript (PubMed:11780124, PubMed:11850408).2 Publications
Show »
Length:371
Mass (Da):39,888
Checksum:i6F67EC346DBF3AC8
GO

<p>In eukaryotic reference proteomes, unreviewed entries that are likely to belong to the same gene are computationally mapped, based on gene identifiers from Ensembl, EnsemblGenomes and model organism databases.<p><a href='/help/gene_centric_isoform_mapping' target='_top'>More...</a></p>Computationally mapped potential isoform sequencesi

There are 3 potential isoforms mapped to this entry.BLASTAlignShow allAdd to basket
EntryEntry nameProtein names
Gene namesLengthAnnotation
G3UYH6G3UYH6_MOUSE
X-box-binding protein 1
Xbp1
127Annotation score:

Annotation score:1 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
A0A5F8MPD3A0A5F8MPD3_MOUSE
X-box-binding protein 1
Xbp1
371Annotation score:

Annotation score:1 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
H3BLF6H3BLF6_MOUSE
X-box-binding protein 1
Xbp1
214Annotation score:

Annotation score:1 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>

Experimental Info

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'Sequence' section reports difference(s) between the canonical sequence (displayed by default in the entry) and the different sequence submissions merged in the entry. These various submissions may originate from different sequencing projects, different types of experiments, or different biological samples. Sequence conflicts are usually of unknown origin.<p><a href='/help/conflict' target='_top'>More...</a></p>Sequence conflicti27Missing in BAB13793 (PubMed:10907849).Curated1

Alternative sequence

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'Sequence' section describes the sequence of naturally occurring alternative protein isoform(s). The changes in the amino acid sequence may be due to alternative splicing, alternative promoter usage, alternative initiation, or ribosomal frameshifting.<p><a href='/help/var_seq' target='_top'>More...</a></p>Alternative sequenceiVSP_012937162 – 267LRLCA…YTPSL → GAGPVVTSPEHLPMDSDTVA SSDSESDILLGILDKLDPVM FFKCPSPESASLEELPEVYP EGPSSLPASLSLSVGTSSAK LEAINELIRFDHVYTKPLVL EIPSETESQTNVVVKIEEAP LSSSEEDHPEFIVSVKKEPL EDDFIPELGISNLLSSSHCL RPPSCLLDAHSDCGYEGSPS PFSDMSSPLGTDHSWEDTFA NELFPQLISV in isoform 2. 1 PublicationAdd BLAST106

Sequence databases

Select the link destinations:

EMBL nucleotide sequence database

More...EMBLi

GenBank nucleotide sequence database

More...GenBanki

DNA Data Bank of Japan; a nucleotide sequence database

More...DDBJi
Links Updated
AB036745 Genomic DNA Translation: BAB13793.1
AF443192 mRNA Translation: AAL60202.1
AF027963 mRNA Translation: AAB81862.2
AL662876 Genomic DNA No translation available.
BC008153 mRNA Translation: AAH08153.1
BC029197 mRNA Translation: AAH29197.1

The Consensus CDS (CCDS) project

More...CCDSi		CCDS24400.1 [O35426-1]

Protein sequence database of the Protein Information Resource

More...PIRi		JC7300

NCBI Reference Sequences

More...RefSeqi		NP_001258659.1, NM_001271730.1 [O35426-2]
NP_038870.2, NM_013842.3 [O35426-1]

Genome annotation databases

Ensembl eukaryotic genome annotation project

More...Ensembli		ENSMUST00000063084; ENSMUSP00000054852; ENSMUSG00000020484 [O35426-1]

Database of genes from NCBI RefSeq genomes

More...GeneIDi		22433

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...KEGGi		mmu:22433

UCSC genome browser

More...UCSCi		uc007hwm.2 mouse [O35426-2]
uc007hwn.2 mouse [O35426-1]

Keywords - Coding sequence diversityi

Alternative splicing

<p>This section provides links to proteins that are similar to the protein sequence(s) described in this entry at different levels of sequence identity thresholds (100%, 90% and 50%) based on their membership in UniProt Reference Clusters (<a href="http://www.uniprot.org/help/uniref">UniRef</a>).<p><a href='/help/similar_proteins_section' target='_top'>More...</a></p>Similar proteinsi

<p>This section is used to point to information related to entries and found in data collections other than UniProtKB.<p><a href='/help/cross_references_section' target='_top'>More...</a></p>Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AB036745 Genomic DNA Translation: BAB13793.1
AF443192 mRNA Translation: AAL60202.1
AF027963 mRNA Translation: AAB81862.2
AL662876 Genomic DNA No translation available.
BC008153 mRNA Translation: AAH08153.1
BC029197 mRNA Translation: AAH29197.1
CCDSiCCDS24400.1 [O35426-1]
PIRiJC7300
RefSeqiNP_001258659.1, NM_001271730.1 [O35426-2]
NP_038870.2, NM_013842.3 [O35426-1]

3D structure databases

SMRiO35426
ModBaseiSearch...

Protein-protein interaction databases

BioGridi204589, 3 interactors
STRINGi10090.ENSMUSP00000054852

PTM databases

iPTMnetiO35426
PhosphoSitePlusiO35426

Proteomic databases

PaxDbiO35426
PRIDEiO35426

Protocols and materials databases

Antibodypedia a portal for validated antibodies

More...Antibodypediai		10221 685 antibodies

Genome annotation databases

EnsembliENSMUST00000063084; ENSMUSP00000054852; ENSMUSG00000020484 [O35426-1]
GeneIDi22433
KEGGimmu:22433
UCSCiuc007hwm.2 mouse [O35426-2]
uc007hwn.2 mouse [O35426-1]

Organism-specific databases

Comparative Toxicogenomics Database

More...CTDi		7494
MGIiMGI:98970 Xbp1

Phylogenomic databases

eggNOGiKOG4005 Eukaryota
ENOG410XSJI LUCA
GeneTreeiENSGT00390000017751
HOGENOMiCLU_093516_0_0_1
InParanoidiO35426
KOiK09027
OMAiNQELRCR
OrthoDBi1269901at2759
TreeFamiTF319837

Miscellaneous databases

ChiTaRS: a database of human, mouse and fruit fly chimeric transcripts and RNA-sequencing data

More...ChiTaRSi		Xbp1 mouse

Protein Ontology

More...PROi		PR:O35426
RNActiO35426 protein

The Stanford Online Universal Resource for Clones and ESTs

More...SOURCEi		Search...

Gene expression databases

BgeeiENSMUSG00000020484 Expressed in lacrimal gland and 307 other tissues
ExpressionAtlasiO35426 baseline and differential
GenevisibleiO35426 MM

Family and domain databases

InterProiView protein in InterPro
IPR004827 bZIP
PfamiView protein in Pfam
PF07716 bZIP_2, 1 hit
SMARTiView protein in SMART
SM00338 BRLZ, 1 hit
PROSITEiView protein in PROSITE
PS50217 BZIP, 1 hit
PS00036 BZIP_BASIC, 1 hit

ProtoNet; Automatic hierarchical classification of proteins

More...ProtoNeti		Search...

MobiDB: a database of protein disorder and mobility annotations

More...MobiDBi		Search...

<p>This section provides general information on the entry.<p><a href='/help/entry_information_section' target='_top'>More...</a></p>Entry informationi

<p>This subsection of the 'Entry information' section provides a mnemonic identifier for a UniProtKB entry, but it is not a stable identifier. Each reviewed entry is assigned a unique entry name upon integration into UniProtKB/Swiss-Prot.<p><a href='/help/entry_name' target='_top'>More...</a></p>Entry nameiXBP1_MOUSE
<p>This subsection of the 'Entry information' section provides one or more accession number(s). These are stable identifiers and should be used to cite UniProtKB entries. Upon integration into UniProtKB, each entry is assigned a unique accession number, which is called 'Primary (citable) accession number'.<p><a href='/help/accession_numbers' target='_top'>More...</a></p>AccessioniPrimary (citable) accession number: O35426
Secondary accession number(s): Q8VHM0, Q922G5, Q9ESS3
<p>This subsection of the 'Entry information' section shows the date of integration of the entry into UniProtKB, the date of the last sequence update and the date of the last annotation modification ('Last modified'). The version number for both the entry and the <a href="http://www.uniprot.org/help/canonical%5Fand%5Fisoforms">canonical sequence</a> are also displayed.<p><a href='/help/entry_history' target='_top'>More...</a></p>Entry historyiIntegrated into UniProtKB/Swiss-Prot: March 1, 2005
Last sequence update: June 1, 2001
Last modified: April 22, 2020
This is version 163 of the entry and version 2 of the sequence. See complete history.
<p>This subsection of the 'Entry information' section indicates whether the entry has been manually annotated and reviewed by UniProtKB curators or not, in other words, if the entry belongs to the Swiss-Prot section of UniProtKB (<strong>reviewed</strong>) or to the computer-annotated TrEMBL section (<strong>unreviewed</strong>).<p><a href='/help/entry_status' target='_top'>More...</a></p>Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programChordata Protein Annotation Program

<p>This section contains any relevant information that doesn't fit in any other defined sections<p><a href='/help/miscellaneous_section' target='_top'>More...</a></p>Miscellaneousi

Keywords - Technical termi

Reference proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families
  2. MGD cross-references
    Mouse Genome Database (MGD) cross-references in UniProtKB/Swiss-Prot
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