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UniProtKB - P15391 (CD19_HUMAN)

Entry version 218 (02 Jun 2021)
Sequence version 6 (13 Nov 2007)
Previous versions | rss
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Protein

B-lymphocyte antigen CD19

Gene

CD19

Organism
Homo sapiens (Human)
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 coreceptor for the B-cell antigen receptor complex (BCR) on B-lymphocytes. Decreases the threshold for activation of downstream signaling pathways and for triggering B-cell responses to antigens (PubMed:2463100, PubMed:1373518, PubMed:16672701).

Activates signaling pathways that lead to the activation of phosphatidylinositol 3-kinase and the mobilization of intracellular Ca2+ stores (PubMed:9382888, PubMed:9317126, PubMed:12387743, PubMed:16672701).

Is not required for early steps during B cell differentiation in the blood marrow (PubMed:9317126).

Required for normal differentiation of B-1 cells (By similarity).

Required for normal B cell differentiation and proliferation in response to antigen challenges (PubMed:2463100, PubMed:1373518).

Required for normal levels of serum immunoglobulins, and for production of high-affinity antibodies in response to antigen challenge (PubMed:9317126, PubMed:12387743, PubMed:16672701).

By similarity6 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 - 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

Biological processAdaptive immunity, Immunity

Enzyme and pathway databases

Pathway Commons web resource for biological pathway data

More...PathwayCommonsi		P15391

Reactome - a knowledgebase of biological pathways and processes

More...Reactomei		R-HSA-1257604, PIP3 activates AKT signaling
R-HSA-198933, Immunoregulatory interactions between a Lymphoid and a non-Lymphoid cell
R-HSA-2219530, Constitutive Signaling by Aberrant PI3K in Cancer
R-HSA-6811558, PI5P, PP2A and IER3 Regulate PI3K/AKT Signaling
R-HSA-977606, Regulation of Complement cascade
R-HSA-983695, Antigen activates B Cell Receptor (BCR) leading to generation of second messengers

SignaLink: a signaling pathway resource with multi-layered regulatory networks

More...SignaLinki		P15391

SIGNOR Signaling Network Open Resource

More...SIGNORi		P15391

<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:
B-lymphocyte antigen CD19
Alternative name(s):
B-lymphocyte surface antigen B4
Differentiation antigen CD19
T-cell surface antigen Leu-12
CD_antigen: CD19
<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:CD19
<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>OrganismiHomo sapiens (Human)
<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 identifieri9606 [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 › Primates › Haplorrhini › Catarrhini › Hominidae › Homo
<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
  • UP000005640 <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 16

Organism-specific databases

Human Gene Nomenclature Database

More...HGNCi		HGNC:1633, CD19

Online Mendelian Inheritance in Man (OMIM)

More...MIMi		107265, gene

neXtProt; the human protein knowledge platform

More...neXtProti		NX_P15391

Eukaryotic Pathogen, Vector and Host Database Resources

More...VEuPathDBi		HostDB:ENSG00000177455.11

<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

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 domaini20 – 291ExtracellularSequence analysisAdd BLAST272
<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>Transmembranei292 – 313HelicalSequence analysisAdd BLAST22
Topological domaini314 – 556CytoplasmicSequence analysisAdd BLAST243

Keywords - Cellular componenti

Cell membrane, Membrane

<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 provides information on the disease(s) associated with genetic variations in a given protein. The information is extracted from the scientific literature and diseases that are also described in the <a href="http://www.ncbi.nlm.nih.gov/sites/entrez?db=omim">OMIM</a> database are represented with a <a href="http://www.uniprot.org/diseases">controlled vocabulary</a> in the following way:<p><a href='/help/involvement_in_disease' target='_top'>More...</a></p>Involvement in diseasei

Immunodeficiency, common variable, 3 (CVID3)1 Publication
The disease is caused by variants affecting the gene represented in this entry.
Disease descriptionA primary immunodeficiency characterized by antibody deficiency, hypogammaglobulinemia, recurrent bacterial infections and an inability to mount an antibody response to antigen. The defect results from a failure of B-cell differentiation and impaired secretion of immunoglobulins; the numbers of circulating B-cells is usually in the normal range, but can be low.
Related information in OMIM

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>Mutagenesisi309 – 556Missing : Abolishes the ability to activate signaling pathways that mediate mobilization of cytoplasmic Ca(2+). Abolishes the ability to restore normal B cell functions and responses to antigenic stimuli. 1 PublicationAdd BLAST248
Mutagenesisi348Y → F: No effect on the ability to complement impaired B cell development and functions; when associated with F-378. 1 Publication1
Mutagenesisi378Y → F: No effect on the ability to complement impaired B cell development and functions; when associated with F-348. 1 Publication1
Mutagenesisi409Y → F: No effect on the ability to complement impaired B cell development and functions; when associated with F-439. 1 Publication1
Mutagenesisi421Y → F: No effect on the ability to complement impaired B cell development and functions; when associated with F-461. 1 Publication1
Mutagenesisi439Y → F: No effect on the ability to complement impaired B cell development and functions; when associated with F-409. 1 Publication1
Mutagenesisi461Y → F: No effect on the ability to complement impaired B cell development and functions; when associated with F-421. 1 Publication1
Mutagenesisi500Y → F: Strongly reduced tyrosine phosphorylation; when associated with F-531. Abolishes activation of signaling pathways that mediate mobilization of cytoplasmic Ca(2+); when associated with F-531. Abolishes the ability to complement impaired B cell development and functions; when associated with F-531. 3 Publications1
Mutagenesisi531Y → F: Strongly reduced tyrosine phosphorylation; when associated with F-500. Abolishes activation of signaling pathways that mediate mobilization of cytoplasmic Ca(2+); when associated with F-500. Abolishes the ability to complement impaired B cell development and functions; when associated with F-500. 3 Publications1

Organism-specific databases

DisGeNET

More...DisGeNETi		930

MalaCards human disease database

More...MalaCardsi		CD19
MIMi613493, phenotype

Open Targets

More...OpenTargetsi		ENSG00000177455

Orphanet; a database dedicated to information on rare diseases and orphan drugs

More...Orphaneti		1572, Common variable immunodeficiency

The Pharmacogenetics and Pharmacogenomics Knowledge Base

More...PharmGKBi		PA26192

Miscellaneous databases

Pharos NIH Druggable Genome Knowledgebase

More...Pharosi		P15391, Tclin

Chemistry databases

ChEMBL database of bioactive drug-like small molecules

More...ChEMBLi		CHEMBL3390821

Drug and drug target database

More...DrugBanki		DB13915, Axicabtagene ciloleucel
DB09052, Blinatumomab
DB15699, Brexucabtagene autoleucel
DB06342, Coltuximab ravtansine
DB12530, Inebilizumab
DB15044, Tafasitamab
DB13881, Tisagenlecleucel

DrugCentral

More...DrugCentrali		P15391

IUPHAR/BPS Guide to PHARMACOLOGY

More...GuidetoPHARMACOLOGYi		2764

Genetic variation databases

BioMuta curated single-nucleotide variation and disease association database

More...BioMutai		CD19

Domain mapping of disease mutations (DMDM)

More...DMDMi		160332376

<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 denotes the presence of an N-terminal signal peptide.<p><a href='/help/signal' target='_top'>More...</a></p>Signal peptidei1 – 19Sequence analysisAdd BLAST19
<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_000001464820 – 556B-lymphocyte antigen CD19Add BLAST537

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the PTM / Processing":/help/ptm_processing_section section describes the positions of cysteine residues participating in disulfide bonds.<p><a href='/help/disulfid' target='_top'>More...</a></p>Disulfide bondi38 ↔ 261Combined sources1 Publication
<p>This subsection of the <a href="http://www.uniprot.org/help/ptm%5Fprocessing%5Fsection">PTM / Processing</a> section specifies the position and type of each covalently attached glycan group (mono-, di-, or polysaccharide).<p><a href='/help/carbohyd' target='_top'>More...</a></p>Glycosylationi86N-linked (GlcNAc...) asparagineCombined sources1 Publication1
Disulfide bondi97 ↔ 200Combined sources1 Publication
Glycosylationi125N-linked (GlcNAc...) asparagineCombined sources1 Publication1
Disulfide bondi134 ↔ 173Combined sources1 Publication
Glycosylationi138N-linked (GlcNAc...) asparagineSequence analysis1
Glycosylationi181N-linked (GlcNAc...) asparagineSequence analysis1
<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 residuei227PhosphoserineBy similarity1
Glycosylationi265N-linked (GlcNAc...) asparagineSequence analysis1
Modified residuei348Phosphotyrosine1 Publication1
Modified residuei378Phosphotyrosine1 Publication1
Modified residuei409Phosphotyrosine1 Publication1
Modified residuei439Phosphotyrosine1 Publication1
Modified residuei500Phosphotyrosine1 Publication1
Modified residuei531Phosphotyrosine1 Publication1

<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

Phosphorylated on tyrosine following B-cell activation (PubMed:7684160, PubMed:7687539, PubMed:10706702, PubMed:12387743). Phosphorylated on tyrosine residues by LYN (PubMed:7687428). Tyrosine residues are phosphorylated sequentially after activation of the B cell receptor. Phosphorylation of Tyr-531 is extremely rapid, followed by phosphorylation at Tyr-409. In contrast, phosphorylation of Tyr-500 appears more slowly and is more transient, returning rapidly to basal levels (By similarity).By similarity5 Publications

Keywords - PTMi

Disulfide bond, Glycoprotein, Phosphoprotein

Proteomic databases

MassIVE - Mass Spectrometry Interactive Virtual Environment

More...MassIVEi		P15391

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

More...PaxDbi		P15391

PeptideAtlas

More...PeptideAtlasi		P15391

PRoteomics IDEntifications database

More...PRIDEi		P15391

ProteomicsDB: a multi-organism proteome resource

More...ProteomicsDBi		27066
53135 [P15391-1]

PTM databases

GlyGen: Computational and Informatics Resources for Glycoscience

More...GlyGeni		P15391, 5 sites

iPTMnet integrated resource for PTMs in systems biology context

More...iPTMneti		P15391

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

More...PhosphoSitePlusi		P15391

<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

Detected on marginal zone and germinal center B cells in lymph nodes (PubMed:2463100). Detected on blood B cells (at protein level) (PubMed:2463100, PubMed:16672701).2 Publications

Gene expression databases

Bgee dataBase for Gene Expression Evolution

More...Bgeei		ENSG00000177455, Expressed in tonsil and 124 other tissues

Genevisible search portal to normalized and curated expression data from Genevestigator

More...Genevisiblei		P15391, HS

Organism-specific databases

Human Protein Atlas

More...HPAi		ENSG00000177455, Group enriched (blood, intestine, lymphoid tissue)

<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

Interacts with CR2/CD21 (PubMed:1702139).

Part of a complex composed of CD19, CR2/CD21, CD81 and IFITM1/CD225 in the membrane of mature B-cells (PubMed:1383329).

Interacts directly with CD81 (via the second extracellular domain); this interaction is initiated early during biosynthesis in the ER/pre-Golgi compartments and is essential for trafficking and compartmentalization of CD19 receptor on the cell surface of activated B cells (PubMed:16449649).

Interacts with VAV (PubMed:10706702).

Interacts with GRB2 and SOS when phosphorylated on Tyr-348 and/or Tyr-378.

Interacts with PLCG2 when phosphorylated on Tyr-409 (PubMed:10706702).

Interacts with LYN (PubMed:7687428).

Interacts (when tyrosine phosphorylated) with the regulatory p85 subunit of phosphatidylinositol 3-kinase (PIK3R1 or PIK3R2) (PubMed:7684160).

6 Publications

Protein-protein interaction databases

The Biological General Repository for Interaction Datasets (BioGRID)

More...BioGRIDi		107368, 20 interactors

CORUM comprehensive resource of mammalian protein complexes

More...CORUMi		P15391

The Eukaryotic Linear Motif resource for Functional Sites in Proteins

More...ELMi		P15391

Protein interaction database and analysis system

More...IntActi		P15391, 12 interactors

Molecular INTeraction database

More...MINTi		P15391

STRING: functional protein association networks

More...STRINGi		9606.ENSP00000437940

Miscellaneous databases

RNAct, Protein-RNA interaction predictions for model organisms.

More...RNActi		P15391, 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

Secondary structure

1556
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details

3D structure databases

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

More...SMRi		P15391

Database of comparative protein structure models

More...ModBasei		Search...

Protein Data Bank in Europe - Knowledge Base

More...PDBe-KBi		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>Domaini20 – 113Ig-like C2-type 1Add BLAST94
Domaini176 – 277Ig-like C2-type 2Add BLAST102

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>Regioni329 – 355DisorderedSequence analysisAdd BLAST27
Regioni372 – 497DisorderedSequence analysisAdd BLAST126
Regioni513 – 556DisorderedSequence analysisAdd BLAST44

Compositional bias

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'Family and Domains' section describes the position of regions of compositional bias within the protein and the particular type of amino acids that are over-represented within those regions.<p><a href='/help/compbias' target='_top'>More...</a></p>Compositional biasi340 – 355Polar residuesSequence analysisAdd BLAST16
Compositional biasi403 – 423Acidic residuesSequence analysisAdd BLAST21
Compositional biasi424 – 438Polar residuesSequence analysisAdd BLAST15
Compositional biasi444 – 466Acidic residuesSequence analysisAdd BLAST23

Keywords - Domaini

Immunoglobulin domain, Repeat, Signal, Transmembrane, Transmembrane helix

Phylogenomic databases

evolutionary genealogy of genes: Non-supervised Orthologous Groups

More...eggNOGi		ENOG502STG8, Eukaryota

Ensembl GeneTree

More...GeneTreei		ENSGT00390000014991

The HOGENOM Database of Homologous Genes from Fully Sequenced Organisms

More...HOGENOMi		CLU_038774_0_0_1

InParanoid: Eukaryotic Ortholog Groups

More...InParanoidi		P15391

Identification of Orthologs from Complete Genome Data

More...OMAi		LWLPCGV

Database of Orthologous Groups

More...OrthoDBi		521520at2759

Database for complete collections of gene phylogenies

More...PhylomeDBi		P15391

TreeFam database of animal gene trees

More...TreeFami		TF338293

Family and domain databases

Gene3D Structural and Functional Annotation of Protein Families

More...Gene3Di		2.60.40.10, 1 hit

Integrated resource of protein families, domains and functional sites

More...InterProi		View protein in InterPro
IPR042341, CD19
IPR007110, Ig-like_dom
IPR036179, Ig-like_dom_sf
IPR013783, Ig-like_fold
IPR003599, Ig_sub

The PANTHER Classification System

More...PANTHERi		PTHR16674, PTHR16674, 1 hit

Simple Modular Architecture Research Tool; a protein domain database

More...SMARTi		View protein in SMART
SM00409, IG, 2 hits

Superfamily database of structural and functional annotation

More...SUPFAMi		SSF48726, SSF48726, 2 hits

PROSITE; a protein domain and family database

More...PROSITEi		View protein in PROSITE
PS50835, IG_LIKE, 2 hits

<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.<p><a href='/help/alternative_products' target='_top'>More...</a></p> isoformsi produced by alternative splicing. AlignAdd to basket
Isoform 1 (identifier: P15391-1) [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
MPPPRLLFFL LFLTPMEVRP EEPLVVKVEE GDNAVLQCLK GTSDGPTQQL 
        60         70         80         90        100
TWSRESPLKP FLKLSLGLPG LGIHMRPLAI WLFIFNVSQQ MGGFYLCQPG 
       110        120        130        140        150
PPSEKAWQPG WTVNVEGSGE LFRWNVSDLG GLGCGLKNRS SEGPSSPSGK 
       160        170        180        190        200
LMSPKLYVWA KDRPEIWEGE PPCLPPRDSL NQSLSQDLTM APGSTLWLSC 
       210        220        230        240        250
GVPPDSVSRG PLSWTHVHPK GPKSLLSLEL KDDRPARDMW VMETGLLLPR 
       260        270        280        290        300
ATAQDAGKYY CHRGNLTMSF HLEITARPVL WHWLLRTGGW KVSAVTLAYL 
       310        320        330        340        350
IFCLCSLVGI LHLQRALVLR RKRKRMTDPT RRFFKVTPPP GSGPQNQYGN 
       360        370        380        390        400
VLSLPTPTSG LGRAQRWAAG LGGTAPSYGN PSSDVQADGA LGSRSPPGVG 
       410        420        430        440        450
PEEEEGEGYE EPDSEEDSEF YENDSNLGQD QLSQDGSGYE NPEDEPLGPE 
       460        470        480        490        500
DEDSFSNAES YENEDEELTQ PVARTMDFLS PHGSAWDPSR EATSLGSQSY 
       510        520        530        540        550
EDMRGILYAA PQLRSIRGQP GPNHEEDADS YENMDNPDGP DPAWGGGGRM 

GTWSTR
Length:556
Mass (Da):61,128
Last modified:November 13, 2007 - v6
<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:iA0E08DD628B69E51
GO
Isoform 2 (identifier: P15391-2) [UniParc]FASTAAdd to basket

The sequence of this isoform differs from the canonical sequence as follows:
     495-495: L → LA

Show »
Length:557
Mass (Da):61,200
Checksum:i49A39D679F6C6C9A
GO

<p>This subsection of the 'Sequence' section reports difference(s) between the protein sequence shown in the UniProtKB entry and other available protein sequences derived from the same gene.<p><a href='/help/sequence_caution' target='_top'>More...</a></p>Sequence cautioni

The sequence AAA35533 differs from that shown. Reason: Frameshift.Curated

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 conflicti29E → EG in AAB60697 (PubMed:1370948).Curated1
Sequence conflicti80I → S in AAA68490 (PubMed:2472450).Curated1
Sequence conflicti80I → S in AAA69966 (PubMed:1375324).Curated1
Sequence conflicti80I → S in AAB60697 (PubMed:1370948).Curated1
Sequence conflicti80I → S in BAB60954 (PubMed:12215898).Curated1
Sequence conflicti186Q → QAFLVLSLPVP in AAA69966 (PubMed:1375324).Curated1

Natural variant

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'Sequence' section describes natural variant(s) of the protein sequence.<p><a href='/help/variant' target='_top'>More...</a></p>Natural variantiVAR_026963174L → V8 PublicationsCorresponds to variant dbSNP:rs2904880EnsemblClinVar.1
Natural variantiVAR_036987514R → H2 PublicationsCorresponds to variant dbSNP:rs34763945EnsemblClinVar.1

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_047194495L → LA in isoform 2. 1 Publication1

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
M21097 mRNA Translation: AAA35533.1 Frameshift.
M28170 mRNA Translation: AAA68490.1
M84371 Genomic DNA Translation: AAA69966.1
M62550 M62549 Genomic DNA Translation: AAB60697.1
AB052799 Genomic DNA Translation: BAB60954.1
AK313577 mRNA No translation available.
EF064757 Genomic DNA Translation: ABK41940.1
AC109460 Genomic DNA No translation available.
CH471267 Genomic DNA Translation: EAW52012.1
BC006338 mRNA Translation: AAH06338.1

The Consensus CDS (CCDS) project

More...CCDSi		CCDS10644.1 [P15391-1]
CCDS53998.1 [P15391-2]

Protein sequence database of the Protein Information Resource

More...PIRi		A44441

NCBI Reference Sequences

More...RefSeqi		NP_001171569.1, NM_001178098.1 [P15391-2]
NP_001761.3, NM_001770.5 [P15391-1]

Genome annotation databases

Ensembl eukaryotic genome annotation project

More...Ensembli		ENST00000324662; ENSP00000313419; ENSG00000177455 [P15391-2]
ENST00000538922; ENSP00000437940; ENSG00000177455 [P15391-1]

Database of genes from NCBI RefSeq genomes

More...GeneIDi		930

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...KEGGi		hsa:930

UCSC genome browser

More...UCSCi		uc002drs.4, human [P15391-1]

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

<p>This subsection of the <a href="http://www.uniprot.org/manual/cross%5Freferences%5Fsection">Cross-references</a> section provides links to various web resources that are relevant for a specific protein.<p><a href='/help/web_resource' target='_top'>More...</a></p>Web resourcesi

CD19base

CD19 mutation db

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
M21097 mRNA Translation: AAA35533.1 Frameshift.
M28170 mRNA Translation: AAA68490.1
M84371 Genomic DNA Translation: AAA69966.1
M62550 M62549 Genomic DNA Translation: AAB60697.1
AB052799 Genomic DNA Translation: BAB60954.1
AK313577 mRNA No translation available.
EF064757 Genomic DNA Translation: ABK41940.1
AC109460 Genomic DNA No translation available.
CH471267 Genomic DNA Translation: EAW52012.1
BC006338 mRNA Translation: AAH06338.1
CCDSiCCDS10644.1 [P15391-1]
CCDS53998.1 [P15391-2]
PIRiA44441
RefSeqiNP_001171569.1, NM_001178098.1 [P15391-2]
NP_001761.3, NM_001770.5 [P15391-1]

3D structure databases

Select the link destinations:

Protein Data Bank Europe

More...PDBei

Protein Data Bank RCSB

More...RCSB PDBi

Protein Data Bank Japan

More...PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
6AL5X-ray3.00A21-277[»]
7JICelectron microscopy3.80A20-327[»]
SMRiP15391
ModBaseiSearch...
PDBe-KBiSearch...

Protein-protein interaction databases

BioGRIDi107368, 20 interactors
CORUMiP15391
ELMiP15391
IntActiP15391, 12 interactors
MINTiP15391
STRINGi9606.ENSP00000437940

Chemistry databases

ChEMBLiCHEMBL3390821
DrugBankiDB13915, Axicabtagene ciloleucel
DB09052, Blinatumomab
DB15699, Brexucabtagene autoleucel
DB06342, Coltuximab ravtansine
DB12530, Inebilizumab
DB15044, Tafasitamab
DB13881, Tisagenlecleucel
DrugCentraliP15391
GuidetoPHARMACOLOGYi2764

PTM databases

GlyGeniP15391, 5 sites
iPTMnetiP15391
PhosphoSitePlusiP15391

Genetic variation databases

BioMutaiCD19
DMDMi160332376

Proteomic databases

MassIVEiP15391
PaxDbiP15391
PeptideAtlasiP15391
PRIDEiP15391
ProteomicsDBi27066
53135 [P15391-1]

Protocols and materials databases

ABCD curated depository of sequenced antibodies

More...ABCDi		P15391, 71 sequenced antibodies

Antibodypedia a portal for validated antibodies

More...Antibodypediai		4237, 4421 antibodies

The DNASU plasmid repository

More...DNASUi		930

Genome annotation databases

EnsembliENST00000324662; ENSP00000313419; ENSG00000177455 [P15391-2]
ENST00000538922; ENSP00000437940; ENSG00000177455 [P15391-1]
GeneIDi930
KEGGihsa:930
UCSCiuc002drs.4, human [P15391-1]

Organism-specific databases

Comparative Toxicogenomics Database

More...CTDi		930
DisGeNETi930

GeneCards: human genes, protein and diseases

More...GeneCardsi		CD19
HGNCiHGNC:1633, CD19
HPAiENSG00000177455, Group enriched (blood, intestine, lymphoid tissue)
MalaCardsiCD19
MIMi107265, gene
613493, phenotype
neXtProtiNX_P15391
OpenTargetsiENSG00000177455
Orphaneti1572, Common variable immunodeficiency
PharmGKBiPA26192
VEuPathDBiHostDB:ENSG00000177455.11

GenAtlas: human gene database

More...GenAtlasi		Search...

Phylogenomic databases

eggNOGiENOG502STG8, Eukaryota
GeneTreeiENSGT00390000014991
HOGENOMiCLU_038774_0_0_1
InParanoidiP15391
OMAiLWLPCGV
OrthoDBi521520at2759
PhylomeDBiP15391
TreeFamiTF338293

Enzyme and pathway databases

PathwayCommonsiP15391
ReactomeiR-HSA-1257604, PIP3 activates AKT signaling
R-HSA-198933, Immunoregulatory interactions between a Lymphoid and a non-Lymphoid cell
R-HSA-2219530, Constitutive Signaling by Aberrant PI3K in Cancer
R-HSA-6811558, PI5P, PP2A and IER3 Regulate PI3K/AKT Signaling
R-HSA-977606, Regulation of Complement cascade
R-HSA-983695, Antigen activates B Cell Receptor (BCR) leading to generation of second messengers
SignaLinkiP15391
SIGNORiP15391

Miscellaneous databases

BioGRID ORCS database of CRISPR phenotype screens

More...BioGRID-ORCSi		930, 15 hits in 987 CRISPR screens

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

More...ChiTaRSi		CD19, human

The Gene Wiki collection of pages on human genes and proteins

More...GeneWikii		CD19

Database of phenotypes from RNA interference screens in Drosophila and Homo sapiens

More...GenomeRNAii		930
PharosiP15391, Tclin

Protein Ontology

More...PROi		PR:P15391
RNActiP15391, protein

The Stanford Online Universal Resource for Clones and ESTs

More...SOURCEi		Search...

Gene expression databases

BgeeiENSG00000177455, Expressed in tonsil and 124 other tissues
GenevisibleiP15391, HS

Family and domain databases

Gene3Di2.60.40.10, 1 hit
InterProiView protein in InterPro
IPR042341, CD19
IPR007110, Ig-like_dom
IPR036179, Ig-like_dom_sf
IPR013783, Ig-like_fold
IPR003599, Ig_sub
PANTHERiPTHR16674, PTHR16674, 1 hit
SMARTiView protein in SMART
SM00409, IG, 2 hits
SUPFAMiSSF48726, SSF48726, 2 hits
PROSITEiView protein in PROSITE
PS50835, IG_LIKE, 2 hits

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 nameiCD19_HUMAN
<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: P15391
Secondary accession number(s): A0N0P9
, F5H635, Q96S68, Q9BRD6
<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: April 1, 1990
Last sequence update: November 13, 2007
Last modified: June 2, 2021
This is version 218 of the entry and version 6 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
DisclaimerAny medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care.

<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

3D-structure, Reference proteome

Documents

  1. Human cell differentiation molecules
    CD nomenclature of surface proteins of human leucocytes and list of entries
  2. Human chromosome 16
    Human chromosome 16: entries, gene names and cross-references to MIM
  3. Human entries with genetic variants
    List of human entries with genetic variants
  4. Human variants curated from literature reports
    Index of human variants curated from literature reports
  5. MIM cross-references
    Online Mendelian Inheritance in Man (MIM) cross-references in UniProtKB/Swiss-Prot
  6. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
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