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CR1
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  • CR1
PROTEIN STRUCTURE
ANTIBODIES
AND
VALIDATION
Protein structures
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.

CR1
Synonyms CD35, KN
Gene descriptioni

Full gene name according to HGNC.

Complement C3b/C4b receptor 1 (Knops blood group)
Protein classi

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

Read more
Blood group antigen proteins
CD markers
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.

Read more
Membrane
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) 207496147 - 207641765
Number of transcriptsi

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

6
Ensembl ENSG00000203710 (version 103.38)
Entrez gene 1378
HGNC HGNC:2334
UniProt P17927 (UniProt - Evidence at protein level)
neXtProt NX_P17927
Antibodypedia CR1 antibodies


PROTEIN STRUCTUREi

The Structure section provides predicted structures from the Alphafold protein structure database and available experimental structures from Protein Data Bank (PDB).

In the Structure drop-down menu all experimental structures from PDB are available for selection and display. The structures are displayed using the NGL Viewer and can be zoomed-in and rotated either manually or by checking the Autorotate box. The Color scheme can be selected to show the residue index, chain name or confidence score (as B-factors and pLDDT score for experimental and predicted structures, respectively). The positions for available antigen sequences in the structure are shown if Antigens is turned to ON, and the Variants slider can be used to show the positions of clinical and population variants.https://github.com/nglviewer/ngl

Read more

Predicted


Description: Structure prediction from Alphafold project. Structure version 2

# Chains: 1      # Clinical variants: 0      # Population variants: 0

Antigens:

Off
On

Variants:

Off
Clinical
Population

Color scheme:

Confidence
Residue index
Chain name

Autorotate:

Off
On



PROTEIN BROWSERi

The protein browser displays the antigen location on the target protein(s) and the features of the target protein. The tabs at the top of the protein view section can be used to switch between the different splice variants to which an antigen has been mapped.

At the top of the view, the position of the antigen (identified by the corresponding HPA identifier) is shown as a green bar. A yellow triangle on the bar indicates a <100% sequence identity to the protein target.

Below the antigens, the maximum percent sequence identity of the protein to all other proteins from other human genes is displayed, using a sliding window of 10 aa residues (HsID 10) or 50 aa residues (HsID 50). The region with the lowest possible identity is always selected for antigen design, with a maximum identity of 60% allowed for designing a single-target antigen (read more).

The curve in blue displays the predicted antigenicity i.e. the tendency for different regions of the protein to generate an immune response, with peak regions being predicted to be more antigenic.The curve shows average values based on a sliding window approach using an in-house propensity scale. (read more).

If a signal peptide is predicted by a majority of the signal peptide predictors SPOCTOPUS, SignalP 4.0, and Phobius (turquoise) and/or transmembrane regions (orange) are predicted by MDM, these are displayed.

Low complexity regions are shown in yellow and InterPro regions in green. Common (purple) and unique (grey) regions between different splice variants of the gene are also displayed (read more), and at the bottom of the protein view is the protein scale.
CR1-201
CR1-203
CR1-204
CR1-205
CR1-206
CR1-210


PROTEIN INFORMATIONi

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

The ENSP identifier links to the Ensembl website protein summary, while the ENST identifier links to the Ensembl website transcript summary for the selected splice variant. The data in the UniProt column can be expanded to show links to all matching UniProt identifiers for this protein.

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 Gene Ontology terms assigned to this protein are listed if expanding the Gene ontology column. The length of the protein (amino acid residues according to Ensembl), molecular mass (kDalton), predicted signal peptide (according to a majority of the signal peptide predictors SPOCTOPUS, SignalP 4.0, and Phobius) and the number of predicted transmembrane region(s) (according to MDM) are also reported.
Splice variant UniProt Protein class Gene ontology Length & mass Signal peptide
(predicted)
Transmembrane regions
(predicted)
CR1-201
ENSP00000356016
ENST00000367049
E9PDY4 [Direct mapping]
Complement receptor type 1
Show all
Predicted membrane proteins
   Prediction method-based
   Membrane proteins predicted by MDM
   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
Protein evidence (Kim et al 2014)
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0016020 [membrane]
GO:0016021 [integral component of membrane]
Show all
2489 aa
272.9 kDa
Yes 1
CR1-203
ENSP00000356018
ENST00000367051
P17927 [Direct mapping]
Complement receptor type 1
Show all
CD markers
Blood group antigen proteins
Predicted membrane proteins
   Prediction method-based
   Membrane proteins predicted by MDM
   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
Mapped to neXtProt
   neXtProt - Evidence at protein level
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0001618 [virus receptor activity]
GO:0001851 [complement component C3b binding]
GO:0001855 [complement component C4b binding]
GO:0001861 [complement component C4b receptor activity]
GO:0001970 [positive regulation of activation of membrane attack complex]
GO:0001971 [negative regulation of activation of membrane attack complex]
GO:0002376 [immune system process]
GO:0002430 [complement receptor mediated signaling pathway]
GO:0002435 [immune complex clearance by erythrocytes]
GO:0002638 [negative regulation of immunoglobulin production]
GO:0004877 [complement component C3b receptor activity]
GO:0005515 [protein binding]
GO:0005856 [cytoskeleton]
GO:0005886 [plasma membrane]
GO:0005887 [integral component of plasma membrane]
GO:0006957 [complement activation, alternative pathway]
GO:0006958 [complement activation, classical pathway]
GO:0007009 [plasma membrane organization]
GO:0008284 [positive regulation of cell population proliferation]
GO:0009986 [cell surface]
GO:0016020 [membrane]
GO:0016021 [integral component of membrane]
GO:0016032 [viral process]
GO:0030449 [regulation of complement activation]
GO:0030667 [secretory granule membrane]
GO:0032689 [negative regulation of interferon-gamma production]
GO:0032703 [negative regulation of interleukin-2 production]
GO:0042130 [negative regulation of T cell proliferation]
GO:0043312 [neutrophil degranulation]
GO:0044853 [plasma membrane raft]
GO:0045087 [innate immune response]
GO:0045589 [regulation of regulatory T cell differentiation]
GO:0045591 [positive regulation of regulatory T cell differentiation]
GO:0045916 [negative regulation of complement activation]
GO:0045918 [negative regulation of cytolysis]
GO:0045957 [negative regulation of complement activation, alternative pathway]
GO:0045959 [negative regulation of complement activation, classical pathway]
GO:0046718 [viral entry into host cell]
GO:0070062 [extracellular exosome]
GO:0101003 [ficolin-1-rich granule membrane]
GO:1900004 [negative regulation of serine-type endopeptidase activity]
GO:1900005 [positive regulation of serine-type endopeptidase activity]
GO:1900099 [negative regulation of plasma cell differentiation]
GO:1904669 [ATP export]
Show all
2039 aa
223.6 kDa
Yes 1
CR1-204
ENSP00000356019
ENST00000367052
Q5SR44 [Direct mapping]
Complement receptor type 1
Show all
Predicted membrane proteins
   Prediction method-based
   Membrane proteins predicted by MDM
   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
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0016020 [membrane]
GO:0016021 [integral component of membrane]
Show all
2039 aa
223.7 kDa
Yes 1
CR1-205
ENSP00000356020
ENST00000367053
P17927 [Direct mapping]
Complement receptor type 1
Show all
CD markers
Blood group antigen proteins
Predicted membrane proteins
   Prediction method-based
   Membrane proteins predicted by MDM
   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
Mapped to neXtProt
   neXtProt - Evidence at protein level
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0001618 [virus receptor activity]
GO:0001851 [complement component C3b binding]
GO:0001855 [complement component C4b binding]
GO:0001861 [complement component C4b receptor activity]
GO:0001970 [positive regulation of activation of membrane attack complex]
GO:0001971 [negative regulation of activation of membrane attack complex]
GO:0002376 [immune system process]
GO:0002430 [complement receptor mediated signaling pathway]
GO:0002435 [immune complex clearance by erythrocytes]
GO:0002638 [negative regulation of immunoglobulin production]
GO:0004877 [complement component C3b receptor activity]
GO:0005515 [protein binding]
GO:0005856 [cytoskeleton]
GO:0005886 [plasma membrane]
GO:0005887 [integral component of plasma membrane]
GO:0006957 [complement activation, alternative pathway]
GO:0006958 [complement activation, classical pathway]
GO:0007009 [plasma membrane organization]
GO:0008284 [positive regulation of cell population proliferation]
GO:0009986 [cell surface]
GO:0016020 [membrane]
GO:0016021 [integral component of membrane]
GO:0016032 [viral process]
GO:0030449 [regulation of complement activation]
GO:0030667 [secretory granule membrane]
GO:0032689 [negative regulation of interferon-gamma production]
GO:0032703 [negative regulation of interleukin-2 production]
GO:0042130 [negative regulation of T cell proliferation]
GO:0043312 [neutrophil degranulation]
GO:0044853 [plasma membrane raft]
GO:0045087 [innate immune response]
GO:0045589 [regulation of regulatory T cell differentiation]
GO:0045591 [positive regulation of regulatory T cell differentiation]
GO:0045916 [negative regulation of complement activation]
GO:0045918 [negative regulation of cytolysis]
GO:0045957 [negative regulation of complement activation, alternative pathway]
GO:0045959 [negative regulation of complement activation, classical pathway]
GO:0046718 [viral entry into host cell]
GO:0070062 [extracellular exosome]
GO:0101003 [ficolin-1-rich granule membrane]
GO:1900004 [negative regulation of serine-type endopeptidase activity]
GO:1900005 [positive regulation of serine-type endopeptidase activity]
GO:1900099 [negative regulation of plasma cell differentiation]
GO:1904669 [ATP export]
Show all
2039 aa
223.7 kDa
Yes 1
CR1-206
ENSP00000383744
ENST00000400960
P17927 [Direct mapping]
Complement receptor type 1
Show all
CD markers
Blood group antigen proteins
Predicted membrane proteins
   Prediction method-based
   Membrane proteins predicted by MDM
   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
Mapped to neXtProt
   neXtProt - Evidence at protein level
Protein evidence (Kim et al 2014)
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0001618 [virus receptor activity]
GO:0001851 [complement component C3b binding]
GO:0001855 [complement component C4b binding]
GO:0001861 [complement component C4b receptor activity]
GO:0001970 [positive regulation of activation of membrane attack complex]
GO:0001971 [negative regulation of activation of membrane attack complex]
GO:0002376 [immune system process]
GO:0002430 [complement receptor mediated signaling pathway]
GO:0002435 [immune complex clearance by erythrocytes]
GO:0002638 [negative regulation of immunoglobulin production]
GO:0004877 [complement component C3b receptor activity]
GO:0005515 [protein binding]
GO:0005856 [cytoskeleton]
GO:0005886 [plasma membrane]
GO:0005887 [integral component of plasma membrane]
GO:0006957 [complement activation, alternative pathway]
GO:0006958 [complement activation, classical pathway]
GO:0007009 [plasma membrane organization]
GO:0008284 [positive regulation of cell population proliferation]
GO:0009986 [cell surface]
GO:0016020 [membrane]
GO:0016021 [integral component of membrane]
GO:0016032 [viral process]
GO:0030449 [regulation of complement activation]
GO:0030667 [secretory granule membrane]
GO:0032689 [negative regulation of interferon-gamma production]
GO:0032703 [negative regulation of interleukin-2 production]
GO:0042130 [negative regulation of T cell proliferation]
GO:0043312 [neutrophil degranulation]
GO:0044853 [plasma membrane raft]
GO:0045087 [innate immune response]
GO:0045589 [regulation of regulatory T cell differentiation]
GO:0045591 [positive regulation of regulatory T cell differentiation]
GO:0045916 [negative regulation of complement activation]
GO:0045918 [negative regulation of cytolysis]
GO:0045957 [negative regulation of complement activation, alternative pathway]
GO:0045959 [negative regulation of complement activation, classical pathway]
GO:0046718 [viral entry into host cell]
GO:0070062 [extracellular exosome]
GO:0101003 [ficolin-1-rich granule membrane]
GO:1900004 [negative regulation of serine-type endopeptidase activity]
GO:1900005 [positive regulation of serine-type endopeptidase activity]
GO:1900099 [negative regulation of plasma cell differentiation]
GO:1904669 [ATP export]
Show all
2039 aa
223.7 kDa
Yes 1
CR1-210
ENSP00000434718
ENST00000529814
H0YE06 [Direct mapping]
Complement receptor type 1
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
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0016020 [membrane]
GO:0016021 [integral component of membrane]
Show all
660 aa
72.8 kDa
Yes 1

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The Human Protein Atlas

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  • HELP & FAQ
The Human Protein Atlas project is funded
by the Knut & Alice Wallenberg Foundation.