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Protein C1QBP PDB 1p32.png
Available structures
PDBOrtholog search: PDBe RCSB
AliasesC1QBP, GHABP1, SF2p32, gC1Q-R, gC1qR, p32, complement component 1, q subcomponent binding protein, complement C1q binding protein, COXPD33
External IDsMGI: 1194505 HomoloGene: 31023 GeneCards: C1QBP
Gene location (Human)
Chromosome 17 (human)
Chr.Chromosome 17 (human)[1]
Chromosome 17 (human)
Genomic location for C1QBP
Genomic location for C1QBP
Band17p13.2Start5,432,777 bp[1]
End5,448,830 bp[1]
RNA expression pattern
PBB GE C1QBP 214214 s at fs.png

PBB GE C1QBP 208910 s at fs.png
More reference expression data
RefSeq (mRNA)



RefSeq (protein)



Location (UCSC)Chr 17: 5.43 – 5.45 MbChr 11: 70.98 – 70.98 Mb
PubMed search[3][4]
View/Edit HumanView/Edit Mouse

Complement component 1 Q subcomponent-binding protein, mitochondrial is a protein that in humans is encoded by the C1QBP gene.[5][6][7]

The human complement subcomponent C1q associates with C1r and C1s in order to yield the first component of the serum complement system. The protein encoded by this gene is known to bind to the globular heads of C1q molecules and inhibit C1 activation. This protein has also been identified as the p32 subunit of pre-mRNA splicing factor SF2, as well as a hyaluronic acid-binding protein.[7]


C1QBP has been shown to interact with Protein kinase D1,[8] BAT2,[9] PRKCD,[8] PKC alpha[8] and Protein kinase Mζ.[8]


  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000108561 - Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000018446 - Ensembl, May 2017
  3. ^ "Human PubMed Reference:".
  4. ^ "Mouse PubMed Reference:".
  5. ^ Deb TB, Datta K (March 1996). "Molecular cloning of human fibroblast hyaluronic acid-binding protein confirms its identity with P-32, a protein co-purified with splicing factor SF2. Hyaluronic acid-binding protein as P-32 protein, co-purified with splicing factor SF2". J Biol Chem. 271 (4): 2206–12. doi:10.1074/jbc.271.4.2206. PMID 8567680.
  6. ^ Ghebrehiwet B, Lim BL, Peerschke EI, Willis AC, Reid KB (June 1994). "Isolation, cDNA cloning, and overexpression of a 33-kD cell surface glycoprotein that binds to the globular "heads" of C1q". J Exp Med. 179 (6): 1809–21. doi:10.1084/jem.179.6.1809. PMC 2191527. PMID 8195709.
  7. ^ a b "Entrez Gene: C1QBP complement component 1, q subcomponent binding protein".
  8. ^ a b c d Storz, P; Hausser A; Link G; Dedio J; Ghebrehiwet B; Pfizenmaier K; Johannes F J (August 2000). "Protein kinase C [micro] is regulated by the multifunctional chaperon protein p32". J. Biol. Chem. UNITED STATES. 275 (32): 24601–7. doi:10.1074/jbc.M002964200. ISSN 0021-9258. PMID 10831594.
  9. ^ Lehner, Ben; Semple Jennifer I; Brown Stephanie E; Counsell Damian; Campbell R Duncan; Sanderson Christopher M (January 2004). "Analysis of a high-throughput yeast two-hybrid system and its use to predict the function of intracellular proteins encoded within the human MHC class III region". Genomics. United States. 83 (1): 153–67. doi:10.1016/S0888-7543(03)00235-0. ISSN 0888-7543. PMID 14667819.

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