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Protein

Complement C1q subcomponent subunit A

Gene

C1QA

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

C1q associates with the proenzymes C1r and C1s to yield C1, the first component of the serum complement system. The collagen-like regions of C1q interact with the Ca2+-dependent C1r2C1s2 proenzyme complex, and efficient activation of C1 takes place on interaction of the globular heads of C1q with the Fc regions of IgG or IgM antibody present in immune complexes.

<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

Biological processComplement pathway, Immunity, Innate immunity

Enzyme and pathway databases

Reactome - a knowledgebase of biological pathways and processes

More...
Reactomei
R-HSA-166663 Initial triggering of complement
R-HSA-173623 Classical antibody-mediated complement activation
R-HSA-977606 Regulation of Complement cascade

<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:
Complement C1q subcomponent subunit A
<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:C1QA
<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>OrganismiHomo sapiens (Human)
<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 identifieri9606 [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 lineageiEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiMammaliaEutheriaEuarchontogliresPrimatesHaplorrhiniCatarrhiniHominidaeHomo
<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
  • UP000005640 <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 1

Organism-specific databases

Eukaryotic Pathogen Database Resources

More...
EuPathDBi
HostDB:ENSG00000173372.16

Human Gene Nomenclature Database

More...
HGNCi
HGNC:1241 C1QA

Online Mendelian Inheritance in Man (OMIM)

More...
MIMi
120550 gene

neXtProt; the human protein knowledge platform

More...
neXtProti
NX_P02745

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

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

Keywords - Cellular componenti

Secreted

<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

Complement component C1q deficiency (C1QD)
The disease is caused by mutations affecting the gene represented in this entry.
Disease descriptionA disorder caused by impaired activation of the complement classical pathway. It generally leads to severe immune complex disease with features of systemic lupus erythematosus and glomerulonephritis.
See also OMIM:613652

Organism-specific databases

DisGeNET

More...
DisGeNETi
712

MalaCards human disease database

More...
MalaCardsi
C1QA
MIMi613652 phenotype

Open Targets

More...
OpenTargetsi
ENSG00000173372

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

More...
Orphaneti
300345 Autosomal systemic lupus erythematosus
169147 Immunodeficiency due to a classical component pathway complement deficiency

The Pharmacogenetics and Pharmacogenomics Knowledge Base

More...
PharmGKBi
PA25622

Chemistry databases

Drug and drug target database

More...
DrugBanki
DB00054 Abciximab
DB00051 Adalimumab
DB00092 Alefacept
DB00087 Alemtuzumab
DB00074 Basiliximab
DB00112 Bevacizumab
DB00002 Cetuximab
DB00111 Daclizumab
DB00095 Efalizumab
DB00005 Etanercept
DB00056 Gemtuzumab ozogamicin
DB00078 Ibritumomab tiuxetan
DB00075 Muromonab
DB00108 Natalizumab
DB00110 Palivizumab
DB00073 Rituximab
DB00081 Tositumomab
DB00072 Trastuzumab

Polymorphism and mutation databases

BioMuta curated single-nucleotide variation and disease association database

More...
BioMutai
C1QA

Domain mapping of disease mutations (DMDM)

More...
DMDMi
399138

<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 – 221 PublicationAdd BLAST22
<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_000000351723 – 245Complement C1q subcomponent subunit AAdd BLAST223

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 bondi26Interchain (with C-29 in B chain)
<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 residuei335-hydroxylysine1 Publication1
<p>This subsection of the <a href="http://www.uniprot.org/help/ptm_processing_section">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>Glycosylationi33O-linked (Gal...) hydroxylysine1 Publication1
Modified residuei394-hydroxyproline1 Publication1
Modified residuei454-hydroxyproline1 Publication1
Modified residuei485-hydroxylysine1 Publication1
Glycosylationi48O-linked (Gal...) hydroxylysine1 Publication1
Modified residuei544-hydroxyproline1 Publication1
Modified residuei574-hydroxyproline1 Publication1
Modified residuei675-hydroxylysine1 Publication1
Glycosylationi67O-linked (Gal...) hydroxylysine1 Publication1
Modified residuei734-hydroxyproline1 Publication1
Modified residuei794-hydroxyproline1 Publication1
Modified residuei854-hydroxyproline1 Publication1
Modified residuei1005-hydroxylysine1 Publication1
Glycosylationi100O-linked (Gal...) hydroxylysine1 Publication1
Glycosylationi146N-linked (GlcNAc...) asparagine2 Publications1

<p>This subsection of the <a href="http://www.uniprot.org/help/ptm_processing_section">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

O-linked glycans are assumed to be the Glc-Gal disaccharides typically found as secondary modifications of hydroxylated lysines in collagen-like domains.1 Publication

Keywords - PTMi

Disulfide bond, Glycoprotein, Hydroxylation

Proteomic databases

jPOST - Japan Proteome Standard Repository/Database

More...
jPOSTi
P02745

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

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PaxDbi
P02745

PeptideAtlas

More...
PeptideAtlasi
P02745

PRoteomics IDEntifications database

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PRIDEi
P02745

ProteomicsDB human proteome resource

More...
ProteomicsDBi
51561

PTM databases

GlyConnect protein glycosylation platform

More...
GlyConnecti
1142

iPTMnet integrated resource for PTMs in systems biology context

More...
iPTMneti
P02745

<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

Bgee dataBase for Gene Expression Evolution

More...
Bgeei
ENSG00000173372 Expressed in 209 organ(s), highest expression level in spleen

CleanEx database of gene expression profiles

More...
CleanExi
HS_C1QA

ExpressionAtlas, Differential and Baseline Expression

More...
ExpressionAtlasi
P02745 baseline and differential

Genevisible search portal to normalized and curated expression data from Genevestigator

More...
Genevisiblei
P02745 HS

Organism-specific databases

Human Protein Atlas

More...
HPAi
CAB009823
HPA002350

<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_section">'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_section">'Function'</a> section).<p><a href='/help/subunit_structure' target='_top'>More...</a></p>Subunit structurei

C1 is a calcium-dependent trimolecular complex of C1q, R and S in the molar ration of 1:2:2. C1q subcomponent is composed of nine subunits, six of which are disulfide-linked dimers of the A and B chains, and three of which are disulfide-linked dimers of the C chain. Interacts (via C-terminus) with CD33; this interaction activates CD33 inhibitory motifs (PubMed:28325905). Interacts with CR1 (via Sushi 24 and Sushi 25 domains) (PubMed:29563915, PubMed:9324355).3 Publications

<p>This subsection of the '<a href="http://www.uniprot.org/help/interaction_section%27">Interaction</a> section provides information about binary protein-protein interactions. The data presented in this section are a quality-filtered subset of binary interactions automatically derived from the <a href="http://www.ebi.ac.uk/intact/">IntAct database</a>. It is updated on a monthly basis. Each binary interaction is displayed on a separate line.<p><a href='/help/binary_interactions' target='_top'>More...</a></p>Binary interactionsi

Protein-protein interaction databases

The Biological General Repository for Interaction Datasets (BioGrid)

More...
BioGridi
107173, 19 interactors

ComplexPortal: manually curated resource of macromolecular complexes

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ComplexPortali
CPX-1919 Complement component C1q complex

CORUM comprehensive resource of mammalian protein complexes

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CORUMi
P02745

Protein interaction database and analysis system

More...
IntActi
P02745, 20 interactors

Molecular INTeraction database

More...
MINTi
P02745

STRING: functional protein association networks

More...
STRINGi
9606.ENSP00000363773

<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

1245
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details

3D structure databases

Select the link destinations:

Protein Data Bank Europe

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PDBei

Protein Data Bank RCSB

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RCSB PDBi

Protein Data Bank Japan

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PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1PK6X-ray1.85A112-244[»]
2JG8X-ray2.05A/D112-245[»]
2JG9X-ray1.90A/D112-245[»]
2WNUX-ray2.30A/D112-245[»]
2WNVX-ray1.25A/D112-245[»]
5HKJX-ray1.35A110-245[»]
5HZFX-ray1.55A110-245[»]
6FCZelectron microscopy10.00A112-244[»]

Protein Model Portal of the PSI-Nature Structural Biology Knowledgebase

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ProteinModelPortali
P02745

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

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SMRi
P02745

Database of comparative protein structure models

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ModBasei
Search...

MobiDB: a database of protein disorder and mobility annotations

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MobiDBi
Search...

Miscellaneous databases

Relative evolutionary importance of amino acids within a protein sequence

More...
EvolutionaryTracei
P02745

<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_and_domains_section">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>Domaini31 – 109Collagen-likeAdd BLAST79
Domaini110 – 245C1qPROSITE-ProRule annotationAdd BLAST136

Keywords - Domaini

Collagen, Repeat, Signal

Phylogenomic databases

evolutionary genealogy of genes: Non-supervised Orthologous Groups

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eggNOGi
ENOG410IK45 Eukaryota
ENOG410YJJD LUCA

Ensembl GeneTree

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GeneTreei
ENSGT00940000162143

The HOGENOM Database of Homologous Genes from Fully Sequenced Organisms

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HOGENOMi
HOG000085653

The HOVERGEN Database of Homologous Vertebrate Genes

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HOVERGENi
HBG108220

InParanoid: Eukaryotic Ortholog Groups

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InParanoidi
P02745

KEGG Orthology (KO)

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KOi
K03986

Identification of Orthologs from Complete Genome Data

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OMAi
YYYFTFQ

Database of Orthologous Groups

More...
OrthoDBi
1258047at2759

Database for complete collections of gene phylogenies

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PhylomeDBi
P02745

TreeFam database of animal gene trees

More...
TreeFami
TF329591

Family and domain databases

Gene3D Structural and Functional Annotation of Protein Families

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Gene3Di
2.60.120.40, 1 hit

Integrated resource of protein families, domains and functional sites

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InterProi
View protein in InterPro
IPR001073 C1q_dom
IPR008160 Collagen
IPR037572 Complement_C1q_A
IPR008983 Tumour_necrosis_fac-like_dom

The PANTHER Classification System

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PANTHERi
PTHR45066 PTHR45066, 1 hit

Pfam protein domain database

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Pfami
View protein in Pfam
PF00386 C1q, 1 hit
PF01391 Collagen, 1 hit

Protein Motif fingerprint database; a protein domain database

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PRINTSi
PR00007 COMPLEMNTC1Q

Simple Modular Architecture Research Tool; a protein domain database

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SMARTi
View protein in SMART
SM00110 C1Q, 1 hit

Superfamily database of structural and functional annotation

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SUPFAMi
SSF49842 SSF49842, 1 hit

PROSITE; a protein domain and family database

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PROSITEi
View protein in PROSITE
PS50871 C1Q, 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>.<p><a href='/help/sequences_section' target='_top'>More...</a></p>Sequence (1+)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.

<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 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 has 1 described isoform and 1 potential isoform that is computationally mapped.Show allAlign All

P02745-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MEGPRGWLVL CVLAISLASM VTEDLCRAPD GKKGEAGRPG RRGRPGLKGE
60 70 80 90 100
QGEPGAPGIR TGIQGLKGDQ GEPGPSGNPG KVGYPGPSGP LGARGIPGIK
110 120 130 140 150
GTKGSPGNIK DQPRPAFSAI RRNPPMGGNV VIFDTVITNQ EEPYQNHSGR
160 170 180 190 200
FVCTVPGYYY FTFQVLSQWE ICLSIVSSSR GQVRRSLGFC DTTNKGLFQV
210 220 230 240
VSGGMVLQLQ QGDQVWVEKD PKKGHIYQGS EADSVFSGFL IFPSA
Length:245
Mass (Da):26,017
Last modified:July 1, 1993 - v2
<p>The checksum is a form of redundancy check that is calculated from the sequence. It is useful for tracking sequence updates.</p> <p>It should be noted that while, in theory, two different sequences could have the same checksum value, the likelihood that this would happen is extremely low.</p> <p>However UniProtKB may contain entries with identical sequences in case of multiple genes (paralogs).</p> <p>The checksum is computed as the sequence 64-bit Cyclic Redundancy Check value (CRC64) using the generator polynomial: x<sup>64</sup> + x<sup>4</sup> + x<sup>3</sup> + x + 1. The algorithm is described in the ISO 3309 standard. </p> <p class="publication">Press W.H., Flannery B.P., Teukolsky S.A. and Vetterling W.T.<br /> <strong>Cyclic redundancy and other checksums</strong><br /> <a href="http://www.nrbook.com/b/bookcpdf.php">Numerical recipes in C 2nd ed., pp896-902, Cambridge University Press (1993)</a>)</p> Checksum:i8FF6B6AE02D49C4C
GO

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

There is 1 potential isoform mapped to this entry.BLASTAlignShow allAdd to basket
EntryEntry nameProtein names
Gene namesLengthAnnotation
X6RLJ0X6RLJ0_HUMAN
Complement C1q subcomponent subunit...
C1QA
220Annotation score:

Annotation score:1 out of 5

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

Experimental Info

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the ‘Sequence’ section reports difference(s) between the canonical sequence (displayed by default in the entry) and the different sequence submissions merged in the entry. These various submissions may originate from different sequencing projects, different types of experiments, or different biological samples. Sequence conflicts are usually of unknown origin.<p><a href='/help/conflict' target='_top'>More...</a></p>Sequence conflicti97P → K AA sequence (PubMed:486087).Curated1
Sequence conflicti103K → P AA sequence (PubMed:486087).Curated1
Sequence conflicti172C → N AA sequence (PubMed:6981411).Curated1
Sequence conflicti178S → W AA sequence (PubMed:6981411).Curated1
Sequence conflicti240 – 243LIFP → ILPGF AA sequence (PubMed:6981411).Curated4

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_02109023E → K1 PublicationCorresponds to variant dbSNP:rs17887074EnsemblClinVar.1

Sequence databases

Select the link destinations:

EMBL nucleotide sequence database

More...
EMBLi

GenBank nucleotide sequence database

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GenBanki

DNA Data Bank of Japan; a nucleotide sequence database

More...
DDBJi
Links Updated
AF135157 mRNA Translation: AAD32626.1
AY789471 Genomic DNA Translation: AAV40828.1
AL158086 Genomic DNA Translation: CAI22892.1
AK311980 mRNA Translation: BAG34919.1
AL158086 Genomic DNA Translation: CAI22893.1
CH471134 Genomic DNA Translation: EAW95014.1
BC030153 mRNA Translation: AAH30153.1
BC071986 mRNA Translation: AAH71986.1

The Consensus CDS (CCDS) project

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CCDSi
CCDS226.1

Protein sequence database of the Protein Information Resource

More...
PIRi
S14350 C1HUQA

NCBI Reference Sequences

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RefSeqi
NP_001334394.1, NM_001347465.1
NP_001334395.1, NM_001347466.1
NP_057075.1, NM_015991.3

UniGene gene-oriented nucleotide sequence clusters

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UniGenei
Hs.632379

Genome annotation databases

Ensembl eukaryotic genome annotation project

More...
Ensembli
ENST00000374642; ENSP00000363773; ENSG00000173372
ENST00000402322; ENSP00000385564; ENSG00000173372

Database of genes from NCBI RefSeq genomes

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GeneIDi
712

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...
KEGGi
hsa:712

UCSC genome browser

More...
UCSCi
uc001bfy.4 human

Keywords - Coding sequence diversityi

Polymorphism

<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_references_section">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

C1QAbase

C1QA mutation db

SeattleSNPs

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AF135157 mRNA Translation: AAD32626.1
AY789471 Genomic DNA Translation: AAV40828.1
AL158086 Genomic DNA Translation: CAI22892.1
AK311980 mRNA Translation: BAG34919.1
AL158086 Genomic DNA Translation: CAI22893.1
CH471134 Genomic DNA Translation: EAW95014.1
BC030153 mRNA Translation: AAH30153.1
BC071986 mRNA Translation: AAH71986.1
CCDSiCCDS226.1
PIRiS14350 C1HUQA
RefSeqiNP_001334394.1, NM_001347465.1
NP_001334395.1, NM_001347466.1
NP_057075.1, NM_015991.3
UniGeneiHs.632379

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1PK6X-ray1.85A112-244[»]
2JG8X-ray2.05A/D112-245[»]
2JG9X-ray1.90A/D112-245[»]
2WNUX-ray2.30A/D112-245[»]
2WNVX-ray1.25A/D112-245[»]
5HKJX-ray1.35A110-245[»]
5HZFX-ray1.55A110-245[»]
6FCZelectron microscopy10.00A112-244[»]
ProteinModelPortaliP02745
SMRiP02745
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

BioGridi107173, 19 interactors
ComplexPortaliCPX-1919 Complement component C1q complex
CORUMiP02745
IntActiP02745, 20 interactors
MINTiP02745
STRINGi9606.ENSP00000363773

Chemistry databases

DrugBankiDB00054 Abciximab
DB00051 Adalimumab
DB00092 Alefacept
DB00087 Alemtuzumab
DB00074 Basiliximab
DB00112 Bevacizumab
DB00002 Cetuximab
DB00111 Daclizumab
DB00095 Efalizumab
DB00005 Etanercept
DB00056 Gemtuzumab ozogamicin
DB00078 Ibritumomab tiuxetan
DB00075 Muromonab
DB00108 Natalizumab
DB00110 Palivizumab
DB00073 Rituximab
DB00081 Tositumomab
DB00072 Trastuzumab

PTM databases

GlyConnecti1142
iPTMnetiP02745

Polymorphism and mutation databases

BioMutaiC1QA
DMDMi399138

Proteomic databases

jPOSTiP02745
PaxDbiP02745
PeptideAtlasiP02745
PRIDEiP02745
ProteomicsDBi51561

Protocols and materials databases

The DNASU plasmid repository

More...
DNASUi
712
Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsembliENST00000374642; ENSP00000363773; ENSG00000173372
ENST00000402322; ENSP00000385564; ENSG00000173372
GeneIDi712
KEGGihsa:712
UCSCiuc001bfy.4 human

Organism-specific databases

Comparative Toxicogenomics Database

More...
CTDi
712
DisGeNETi712
EuPathDBiHostDB:ENSG00000173372.16

GeneCards: human genes, protein and diseases

More...
GeneCardsi
C1QA
HGNCiHGNC:1241 C1QA
HPAiCAB009823
HPA002350
MalaCardsiC1QA
MIMi120550 gene
613652 phenotype
neXtProtiNX_P02745
OpenTargetsiENSG00000173372
Orphaneti300345 Autosomal systemic lupus erythematosus
169147 Immunodeficiency due to a classical component pathway complement deficiency
PharmGKBiPA25622

GenAtlas: human gene database

More...
GenAtlasi
Search...

Phylogenomic databases

eggNOGiENOG410IK45 Eukaryota
ENOG410YJJD LUCA
GeneTreeiENSGT00940000162143
HOGENOMiHOG000085653
HOVERGENiHBG108220
InParanoidiP02745
KOiK03986
OMAiYYYFTFQ
OrthoDBi1258047at2759
PhylomeDBiP02745
TreeFamiTF329591

Enzyme and pathway databases

ReactomeiR-HSA-166663 Initial triggering of complement
R-HSA-173623 Classical antibody-mediated complement activation
R-HSA-977606 Regulation of Complement cascade

Miscellaneous databases

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

More...
ChiTaRSi
C1QA human
EvolutionaryTraceiP02745

The Gene Wiki collection of pages on human genes and proteins

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GeneWikii
C1QA

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

More...
GenomeRNAii
712

Protein Ontology

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PROi
PR:P02745

The Stanford Online Universal Resource for Clones and ESTs

More...
SOURCEi
Search...

Gene expression databases

BgeeiENSG00000173372 Expressed in 209 organ(s), highest expression level in spleen
CleanExiHS_C1QA
ExpressionAtlasiP02745 baseline and differential
GenevisibleiP02745 HS

Family and domain databases

Gene3Di2.60.120.40, 1 hit
InterProiView protein in InterPro
IPR001073 C1q_dom
IPR008160 Collagen
IPR037572 Complement_C1q_A
IPR008983 Tumour_necrosis_fac-like_dom
PANTHERiPTHR45066 PTHR45066, 1 hit
PfamiView protein in Pfam
PF00386 C1q, 1 hit
PF01391 Collagen, 1 hit
PRINTSiPR00007 COMPLEMNTC1Q
SMARTiView protein in SMART
SM00110 C1Q, 1 hit
SUPFAMiSSF49842 SSF49842, 1 hit
PROSITEiView protein in PROSITE
PS50871 C1Q, 1 hit

ProtoNet; Automatic hierarchical classification of proteins

More...
ProtoNeti
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 nameiC1QA_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: P02745
Secondary accession number(s): B2R4X2, Q5T963
<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: July 21, 1986
Last sequence update: July 1, 1993
Last modified: January 16, 2019
This is version 202 of the entry and version 2 of the sequence. See complete history.
<p>This subsection of the ‘Entry information’ section indicates whether the entry has been manually annotated and reviewed by UniProtKB curators or not, in other words, if the entry belongs to the Swiss-Prot section of UniProtKB (<strong>reviewed</strong>) or to the computer-annotated TrEMBL section (<strong>unreviewed</strong>).<p><a href='/help/entry_status' target='_top'>More...</a></p>Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programChordata Protein Annotation Program
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, Complete proteome, Direct protein sequencing, Reference proteome

Documents

  1. Human entries with polymorphisms or disease mutations
    List of human entries with polymorphisms or disease mutations
  2. Human polymorphisms and disease mutations
    Index of human polymorphisms and disease mutations
  3. MIM cross-references
    Online Mendelian Inheritance in Man (MIM) cross-references in UniProtKB/Swiss-Prot
  4. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
  5. Human chromosome 1
    Human chromosome 1: entries, gene names and cross-references to MIM
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