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CR2
HPA
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  • CR2
PROTEIN SUMMARY GENE INFORMATION RNA DATA ANTIBODY DATA
GENERAL INFORMATIONi

General description of the gene and the encoded protein(s) using information from HGNC and Ensembl, as well as predictions made by the Human Protein Atlas project.

Gene namei

Official gene symbol, which is typically a short form of the gene name, according to HGNC.

CR2
Synonyms C3DR, CD21
Gene descriptioni

Full gene name according to HGNC.

Complement C3d receptor 2
Protein classi

Assigned HPA protein class(es) for the encoded protein(s).

CD markers
Disease related genes
Human disease related genes
Plasma proteins
Predicted locationi

All transcripts of all genes have been analyzed regarding the location(s) of corresponding protein based on prediction methods for signal peptides and transmembrane regions.

  • Genes with at least one transcript predicted to encode a secreted protein, according to prediction methods or to UniProt location data, have been further annotated and classified with the aim to determine if the corresponding protein(s) are secreted or actually retained in intracellular locations or membrane-attached.

  • Remaining genes, with no transcript predicted to encode a secreted protein, will be assigned the prediction-based location(s).

The annotated location overrules the predicted location, so that a gene encoding a predicted secreted protein that has been annotated as intracellular will have intracellular as the final location.

Membrane, Intracellular
Protein evidence Evidence at protein level (all genes)
GENE INFORMATIONi

Gene information from Ensembl and Entrez, as well as links to available gene identifiers are displayed here. Information was retrieved from Ensembl if not indicated otherwise.

Chromosome 1
Cytoband q32.2
Chromosome location (bp) 207453024 - 207489895
Number of transcriptsi

Number of protein-coding transcripts from the gene as defined by Ensembl.

7
Ensembl ENSG00000117322 (version 109)
Entrez gene 1380
HGNC HGNC:2336
UniProt P20023 (UniProt - Evidence at protein level)
neXtProt NX_P20023
GeneCards CR2
Antibodypedia CR2 antibodies


PROTEIN FUNCTION
Protein function (UniProt)i

Useful information about the protein provided by UniProt.

Serves as a receptor for various ligands including complement component CD3d, HNRNPU OR IFNA1 1, 2, 3. When C3d is bound to antigens, attaches to C3d on B-cell surface and thereby facilitates the recognition and uptake of antigens by B-cells 4. This interaction enhances B-cell activation and subsequent immune responses. Forms a complex with several partners on the surface of B-cells including CD19, FCRL5 and CD81, to form the B-cell coreceptor complex that plays a crucial role in B-cell activation and signaling 5, 6. Induces also specific intracellular signaling separately from the BCR and CD19 by activating the tyrosine kinase SRC, which then phosphorylates nucleolin/NCL and triggers AKT and GSK3 kinase activities in a SYK/CD19-independent manner 7. Acts as a ligand for CD23 (FcepsilonRII), a low-affinity receptor for IgE, which is expressed on B-cells and other immune cells, and thus participates in the regulation of IgE production 8.... show less
Molecular function (UniProt)i

Keywords assigned by UniProt to proteins due to their particular molecular function.

Host cell receptor for virus entry, Receptor
Biological process (UniProt)i

Keywords assigned by UniProt to proteins because they are involved in a particular biological process.

Complement pathway, Host-virus interaction, Immunity, Innate immunity
Gene summary (Entrez)i

Useful information about the gene from Entrez

This gene encodes a membrane protein, which functions as a receptor for Epstein-Barr virus (EBV) binding on B and T lymphocytes. Genetic variations in this gene are associated with susceptibility to systemic lupus erythematosus type 9 (SLEB9). Alternatively spliced transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Sep 2009]... show less
PROTEIN INFORMATIONi

The protein information section displays alternative protein-coding transcripts (splice variants) encoded by this gene according to the Ensembl database.

The Splice variant identifier links to the Ensembl website protein summary for the selected splice variant. The data in the Swissprot and TrEMBL columns links to corresponding pages in the UniProt database.

The protein classes assigned to this protein are shown if expanding the data in the protein class column. Parent protein classes are in bold font and subclasses are listed under the parent class.

The length of the protein (amino acid residues according to Ensembl), molecular mass (kDalton), predicted signal peptide and number of predicted transmembrane region(s) according to in-house majority decision methods based on sets of predictors are also reported.
Splice variant SwissProt TrEMBL Protein class Gene ontology Length & mass Signal peptide
(predicted)
Transmembrane regions
(predicted)
CR2-201
ENSP00000356024
ENST00000367057
P20023
[Direct mapping] Complement receptor type 2
Show all
CD markers
Predicted membrane proteins
   Prediction method-based
   Membrane proteins predicted by MDM
   MEMSAT3 predicted membrane proteins
   MEMSAT-SVM predicted membrane proteins
   Phobius predicted membrane proteins
   SCAMPI predicted membrane proteins
   SPOCTOPUS predicted membrane proteins
   THUMBUP predicted membrane proteins
   TMHMM predicted membrane proteins
   # TM segments-based
   1TM proteins predicted by MDM
Plasma proteins
Disease related genes
Human disease related genes
   Immune system diseases
   Allergies and autoimmune diseases
   Primary immunodeficiency
Mapped to neXtProt
   neXtProt - Evidence at protein level
Protein evidence (Kim et al 2014)
Protein evidence (Ezkurdia et al 2014)
   DeepTMHMM predicted membrane proteins
Show all
GO:0001618 [virus receptor activity]
GO:0001848 [complement binding]
GO:0002376 [immune system process]
GO:0002430 [complement receptor mediated signaling pathway]
GO:0003677 [DNA binding]
GO:0004875 [complement receptor activity]
GO:0004888 [transmembrane signaling receptor activity]
GO:0005515 [protein binding]
GO:0005615 [extracellular space]
GO:0005886 [plasma membrane]
GO:0006955 [immune response]
GO:0006957 [complement activation, alternative pathway]
GO:0006958 [complement activation, classical pathway]
GO:0016020 [membrane]
GO:0030183 [B cell differentiation]
GO:0042100 [B cell proliferation]
GO:0042803 [protein homodimerization activity]
GO:0043235 [receptor complex]
GO:0045087 [innate immune response]
GO:0045959 [negative regulation of complement activation, classical pathway]
GO:0046718 [viral entry into host cell]
GO:0070062 [extracellular exosome]
Show all
1092 aa
119.2 kDa
Yes 1
CR2-202
ENSP00000356025
ENST00000367058
P20023
[Direct mapping] Complement receptor type 2
Show all
CD markers
Predicted membrane proteins
   Prediction method-based
   Membrane proteins predicted by MDM
   MEMSAT3 predicted membrane proteins
   MEMSAT-SVM predicted membrane proteins
   Phobius predicted membrane proteins
   SCAMPI predicted membrane proteins
   SPOCTOPUS predicted membrane proteins
   THUMBUP predicted membrane proteins
   TMHMM predicted membrane proteins
   # TM segments-based
   1TM proteins predicted by MDM
Plasma proteins
Disease related genes
Human disease related genes
   Immune system diseases
   Allergies and autoimmune diseases
   Primary immunodeficiency
Mapped to neXtProt
   neXtProt - Evidence at protein level
Protein evidence (Kim et al 2014)
Protein evidence (Ezkurdia et al 2014)
   DeepTMHMM predicted membrane proteins
Show all
GO:0001618 [virus receptor activity]
GO:0001848 [complement binding]
GO:0002376 [immune system process]
GO:0002430 [complement receptor mediated signaling pathway]
GO:0003677 [DNA binding]
GO:0004875 [complement receptor activity]
GO:0004888 [transmembrane signaling receptor activity]
GO:0005515 [protein binding]
GO:0005615 [extracellular space]
GO:0005886 [plasma membrane]
GO:0006955 [immune response]
GO:0006957 [complement activation, alternative pathway]
GO:0006958 [complement activation, classical pathway]
GO:0016020 [membrane]
GO:0030183 [B cell differentiation]
GO:0042100 [B cell proliferation]
GO:0042803 [protein homodimerization activity]
GO:0043235 [receptor complex]
GO:0045087 [innate immune response]
GO:0045959 [negative regulation of complement activation, classical pathway]
GO:0046718 [viral entry into host cell]
GO:0070062 [extracellular exosome]
Show all
1033 aa
112.9 kDa
Yes 1
CR2-203
ENSP00000356026
ENST00000367059
Q5SR47
[Direct mapping] Complement receptor type 2
Show all
Predicted membrane proteins
   Prediction method-based
   Membrane proteins predicted by MDM
   MEMSAT3 predicted membrane proteins
   MEMSAT-SVM predicted membrane proteins
   Phobius predicted membrane proteins
   SCAMPI predicted membrane proteins
   SPOCTOPUS predicted membrane proteins
   THUMBUP predicted membrane proteins
   TMHMM predicted membrane proteins
   # TM segments-based
   1TM proteins predicted by MDM
Human disease related genes
   Immune system diseases
   Allergies and autoimmune diseases
   Primary immunodeficiency
Protein evidence (Ezkurdia et al 2014)
   DeepTMHMM predicted membrane proteins
Show all
GO:0016020 [membrane]
Show all
971 aa
106.4 kDa
Yes 1
CR2-207
ENSP00000491608
ENST00000640301
A0A1W2PPV2
[Direct mapping] Complement receptor type 2
Show all
Predicted intracellular proteins
   Intracellular proteins predicted by MDM and MDSEC
Human disease related genes
   Immune system diseases
   Allergies and autoimmune diseases
   Primary immunodeficiency
Protein evidence (Ezkurdia et al 2014)
Show all
39 aa
4.6 kDa
No 0
CR2-208
ENSP00000514480
ENST00000699620
Predicted membrane proteins
   Prediction method-based
   Membrane proteins predicted by MDM
   MEMSAT3 predicted membrane proteins
   MEMSAT-SVM predicted membrane proteins
   Phobius predicted membrane proteins
   SCAMPI predicted membrane proteins
   SPOCTOPUS predicted membrane proteins
   THUMBUP predicted membrane proteins
   TMHMM predicted membrane proteins
   # TM segments-based
   1TM proteins predicted by MDM
Human disease related genes
   Immune system diseases
   Allergies and autoimmune diseases
   Primary immunodeficiency
Protein evidence (Ezkurdia et al 2014)
   DeepTMHMM predicted membrane proteins
Show all
910 aa
99.9 kDa
No 1
CR2-209
ENSP00000514481
ENST00000699621
Predicted membrane proteins
   Prediction method-based
   Membrane proteins predicted by MDM
   MEMSAT3 predicted membrane proteins
   MEMSAT-SVM predicted membrane proteins
   Phobius predicted membrane proteins
   SCAMPI predicted membrane proteins
   SPOCTOPUS predicted membrane proteins
   THUMBUP predicted membrane proteins
   TMHMM predicted membrane proteins
   # TM segments-based
   1TM proteins predicted by MDM
Human disease related genes
   Immune system diseases
   Allergies and autoimmune diseases
   Primary immunodeficiency
Protein evidence (Ezkurdia et al 2014)
   DeepTMHMM predicted membrane proteins
Show all
899 aa
98.8 kDa
No 1
CR2-210
ENSP00000514493
ENST00000699640
Predicted intracellular proteins
   Intracellular proteins predicted by MDM and MDSEC
Human disease related genes
   Immune system diseases
   Allergies and autoimmune diseases
   Primary immunodeficiency
Protein evidence (Ezkurdia et al 2014)
Show all
28 aa
3.1 kDa
No 0

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