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Entry version 143 (18 Sep 2019)
Sequence version 1 (01 May 2000)
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Protein

Small nuclear ribonucleoprotein SmD1b

Gene

SMD1B

Organism
Arabidopsis thaliana (Mouse-ear cress)
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>
-Protein inferred from homologyi <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

Involved in splicing regulation. Facilitates post-transcriptional gene silencing (PTGS) by limiting the degradation of transgene aberrant RNAs by the RNA quality control (RQC) machinery, thus favoring their entry into cytoplasmic siRNA bodies where they can trigger PTGS. Does not participate in the production of small RNAs.1 Publication

Miscellaneous

SMD1A and SMD1B have redundant activity, but consistent with their expression level, SMD1B is more important than SMD1A and either one copy of SMD1B or two copies of SMD1A is necessary for the plant to survive.1 Publication

<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

GO - Biological processi

<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 functionRibonucleoprotein

<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_and_taxonomy_section">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:
Small nuclear ribonucleoprotein SmD1b1 Publication
Short name:
AtSmD1-b1 Publication
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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:SMD1B1 Publication
Ordered Locus Names:At4g02840Imported
ORF Names:T5J8.16Imported
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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>OrganismiArabidopsis thaliana (Mouse-ear cress)
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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 identifieri3702 [NCBI]
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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 lineageiEukaryotaViridiplantaeStreptophytaEmbryophytaTracheophytaSpermatophytaMagnoliopsidaeudicotyledonsGunneridaePentapetalaerosidsmalvidsBrassicalesBrassicaceaeCamelineaeArabidopsis
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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
  • UP000006548 <p>A UniProt <a href="http://www.uniprot.org/manual/proteomes_manual">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 4

Organism-specific databases

Arabidopsis Information Portal

More...
Araporti
AT4G02840

The Arabidopsis Information Resource

More...
TAIRi
locus:2140240 AT4G02840

<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 Cell wall Cytoskeleton Vacuole Chloroplast Endosome Peroxisome ER Golgi apparatus Nucleus Mitochondrion Manual annotation Automatic computational assertion Graphics by Christian Stolte & Seán O’Donoghue; Source: COMPARTMENTS

Keywords - Cellular componenti

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

Post-transcriptional gene silencing deficiency and developmental defects, including reduced stature, leaf serration and early flowering (PubMed:26842463). Smd1a and smd2b double mutants are embryo lethal (PubMed:26842463).1 Publication

<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.<p><a href='/help/chain' target='_top'>More...</a></p>ChainiPRO_00004401361 – 116Small nuclear ribonucleoprotein SmD1bAdd BLAST116

Proteomic databases

PRoteomics IDEntifications database

More...
PRIDEi
Q9SY09

<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

Gene expression databases

ExpressionAtlas, Differential and Baseline Expression

More...
ExpressionAtlasi
Q9SY09 baseline and differential

<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

Protein-protein interaction databases

Protein interaction database and analysis system

More...
IntActi
Q9SY09, 2 interactors

STRING: functional protein association networks

More...
STRINGi
3702.AT4G02840.2

<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
Q9SY09

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 ‘Family and Domains’ section indicates the positions and types of repeated sequence motifs or repeated domains within the protein.<p><a href='/help/repeat' target='_top'>More...</a></p>Repeati100 – 1011Curated2
Repeati102 – 1032Curated2
Repeati104 – 1053Curated2
Repeati106 – 1074Curated2
Repeati108 – 1095Curated2
Repeati110 – 1116Curated2
Repeati112 – 1137Curated2
Repeati114 – 1168; approximateCurated3

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>Regioni100 – 1168 X 2 AA approximate tandem repeats of G-RCuratedAdd BLAST17

<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 snRNP core protein family.Curated

Keywords - Domaini

Repeat

Phylogenomic databases

evolutionary genealogy of genes: Non-supervised Orthologous Groups

More...
eggNOGi
KOG3428 Eukaryota
COG1958 LUCA

The HOGENOM Database of Homologous Genes from Fully Sequenced Organisms

More...
HOGENOMi
HOG000182713

KEGG Orthology (KO)

More...
KOi
K11087

Identification of Orthologs from Complete Genome Data

More...
OMAi
CTNETVT

Database of Orthologous Groups

More...
OrthoDBi
1579192at2759

Database for complete collections of gene phylogenies

More...
PhylomeDBi
Q9SY09

Family and domain databases

Conserved Domains Database

More...
CDDi
cd01724 Sm_D1, 1 hit

Integrated resource of protein families, domains and functional sites

More...
InterProi
View protein in InterPro
IPR027141 LSm4/Sm_D1/D3
IPR001163 LSM_dom_euk/arc
IPR010920 LSM_dom_sf
IPR034102 Sm_D1

The PANTHER Classification System

More...
PANTHERi
PTHR23338 PTHR23338, 1 hit

Pfam protein domain database

More...
Pfami
View protein in Pfam
PF01423 LSM, 1 hit

Simple Modular Architecture Research Tool; a protein domain database

More...
SMARTi
View protein in SMART
SM00651 Sm, 1 hit

Superfamily database of structural and functional annotation

More...
SUPFAMi
SSF50182 SSF50182, 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_length">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_section">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical_and_isoforms">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.

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.<p><a href='/help/alternative_products' target='_top'>More...</a></p> isoformsi produced by alternative splicing. AlignAdd to basket
Isoform 1 (identifier: Q9SY09-1) [UniParc]FASTAAdd to basket

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
MKLVRFLMKL NNETVSIELK NGTIVHGTIT GVDVSMNTHL KAVKLTLKGK
60 70 80 90 100
NPVTLDHLSV RGNNIRYYIL PDSLNLETLL VEDTPRIKPK KPTAGKIPAG
110
RGRGRGRGRG RGRGGR
Length:116
Mass (Da):12,750
Last modified:May 1, 2000 - v1
<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:i4ABA07CBD18F2152
GO
Isoform 2 (identifier: Q9SY09-2) [UniParc]FASTAAdd to basket

The sequence of this isoform differs from the canonical sequence as follows:
     30-30: T → TDEYTRFYLNR

Show »
Length:126
Mass (Da):14,108
Checksum:iD10FF264E462A56B
GO

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_05895530T → TDEYTRFYLNR in isoform 2. 1

Sequence databases

Select the link destinations:

EMBL nucleotide sequence database

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EMBLi

GenBank nucleotide sequence database

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GenBanki

DNA Data Bank of Japan; a nucleotide sequence database

More...
DDBJi
Links Updated
AC004044 Genomic DNA Translation: AAD15345.1
AL161495 Genomic DNA Translation: CAB77769.1
CP002687 Genomic DNA Translation: AEE82236.1
CP002687 Genomic DNA Translation: AEE82237.1
AK117672 mRNA Translation: BAC42325.1
BT028879 mRNA Translation: ABI49426.1
AY084707 mRNA Translation: AAM61281.1

Protein sequence database of the Protein Information Resource

More...
PIRi
B85036

NCBI Reference Sequences

More...
RefSeqi
NP_001190664.1, NM_001203735.1 [Q9SY09-2]
NP_192193.1, NM_116518.4 [Q9SY09-1]

Genome annotation databases

Ensembl plant genome annotation project

More...
EnsemblPlantsi
AT4G02840.1; AT4G02840.1; AT4G02840 [Q9SY09-1]
AT4G02840.2; AT4G02840.2; AT4G02840 [Q9SY09-2]

Database of genes from NCBI RefSeq genomes

More...
GeneIDi
828163

Gramene; a comparative resource for plants

More...
Gramenei
AT4G02840.1; AT4G02840.1; AT4G02840 [Q9SY09-1]
AT4G02840.2; AT4G02840.2; AT4G02840 [Q9SY09-2]

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...
KEGGi
ath:AT4G02840

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
AC004044 Genomic DNA Translation: AAD15345.1
AL161495 Genomic DNA Translation: CAB77769.1
CP002687 Genomic DNA Translation: AEE82236.1
CP002687 Genomic DNA Translation: AEE82237.1
AK117672 mRNA Translation: BAC42325.1
BT028879 mRNA Translation: ABI49426.1
AY084707 mRNA Translation: AAM61281.1
PIRiB85036
RefSeqiNP_001190664.1, NM_001203735.1 [Q9SY09-2]
NP_192193.1, NM_116518.4 [Q9SY09-1]

3D structure databases

SMRiQ9SY09
ModBaseiSearch...

Protein-protein interaction databases

IntActiQ9SY09, 2 interactors
STRINGi3702.AT4G02840.2

Proteomic databases

PRIDEiQ9SY09

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsemblPlantsiAT4G02840.1; AT4G02840.1; AT4G02840 [Q9SY09-1]
AT4G02840.2; AT4G02840.2; AT4G02840 [Q9SY09-2]
GeneIDi828163
GrameneiAT4G02840.1; AT4G02840.1; AT4G02840 [Q9SY09-1]
AT4G02840.2; AT4G02840.2; AT4G02840 [Q9SY09-2]
KEGGiath:AT4G02840

Organism-specific databases

AraportiAT4G02840
TAIRilocus:2140240 AT4G02840

Phylogenomic databases

eggNOGiKOG3428 Eukaryota
COG1958 LUCA
HOGENOMiHOG000182713
KOiK11087
OMAiCTNETVT
OrthoDBi1579192at2759
PhylomeDBiQ9SY09

Miscellaneous databases

Protein Ontology

More...
PROi
PR:Q9SY09

Gene expression databases

ExpressionAtlasiQ9SY09 baseline and differential

Family and domain databases

CDDicd01724 Sm_D1, 1 hit
InterProiView protein in InterPro
IPR027141 LSm4/Sm_D1/D3
IPR001163 LSM_dom_euk/arc
IPR010920 LSM_dom_sf
IPR034102 Sm_D1
PANTHERiPTHR23338 PTHR23338, 1 hit
PfamiView protein in Pfam
PF01423 LSM, 1 hit
SMARTiView protein in SMART
SM00651 Sm, 1 hit
SUPFAMiSSF50182 SSF50182, 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 nameiSMD1B_ARATH
<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: Q9SY09
Secondary accession number(s): F4JHV8
<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_and_isoforms">canonical sequence</a> are also displayed.<p><a href='/help/entry_history' target='_top'>More...</a></p>Entry historyiIntegrated into UniProtKB/Swiss-Prot: June 7, 2017
Last sequence update: May 1, 2000
Last modified: September 18, 2019
This is version 143 of the entry and version 1 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 programPlant 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

Complete proteome, Reference proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families
  2. Arabidopsis thaliana
    Arabidopsis thaliana: entries and gene names
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