C1 domain

Phorbol esters/diacylglycerol binding domain (C1 domain)
C1 domain of PKC-delta (1ptr) Middle plane of the lipid bilayer - black dots. Boundary of the hydrocarbon core region - blue dots (cytoplasmic side). Layer of lipid phosphates - yellow dots.
Identifiers
SymbolC1
PfamPF00130
InterProIPR002219
SMARTC1
PROSITEPDOC00379
SCOP22cpk / SCOPe / SUPFAM
OPM superfamily60
OPM protein1ptr
CDDcd00029
Available protein structures:
Pfam  structures / ECOD  
PDBRCSB PDB; PDBe; PDBj
PDBsumstructure summary

C1 domain (also known as phorbol esters/diacylglycerol binding domain) binds an important secondary messenger diacylglycerol (DAG), as well as the analogous phorbol esters.[1] Phorbol esters can directly stimulate protein kinase C, PKC.

Phorbol esters (such as PMA) are analogues of DAG and potent tumor promoters that cause a variety of physiological changes when administered to both cells and tissues. DAG activates a family of serine/threonine protein kinases, collectively known as protein kinase C (PKC). Phorbol esters can directly stimulate PKC.

The N-terminal region of PKC, known as C1, binds PMA and DAG in a phospholipid and zinc-dependent fashion.[2] The C1 region contains one or two copies of a cysteine-rich domain, which is about 50 amino-acid residues long, and which is essential for DAG/PMA-binding.

The DAG/PMA-binding domain binds two zinc ions; the ligands of these metal ions are probably the six cysteines and two histidines that are conserved in this domain.

Human proteins containing this domain

AKAP13; ARAF; ARHGAP29; ARHGEF2; BRAF; CDC42BPA; CDC42BPB; CDC42BPG; CHN1; CHN2; CIT; CIC; DGKA; DGKB; DGKD; DGKE; DGKG; DGKH; DGKI; DGKK; DGKQ; DGKZ; GMIP; HMHA1; KSR1; KSR2; MYO9A; MYO9B; PDZD8; PRKCA; PRKCB1; PRKCD; PRKCE; PRKCG; PRKCH; PRKCI; PRKCN; PRKCQ; PRKCZ; PRKD1; PRKD2; PRKD3; RACGAP1; RAF1; RASGRP; RASGRP1; RASGRP2; RASGRP3; RASGRP4; RASSF1; RASSF5; ROCK1; ROCK2; STAC; STAC2; STAC3; TENC1; UNC13A; UNC13B; UNC13C; VAV1; VAV2; VAV3;

References

  1. ^ Azzi A, Boscoboinik D, Hensey C (1992). "The protein kinase C family". Eur. J. Biochem. 208 (3): 547–557. doi:10.1111/j.1432-1033.1992.tb17219.x. PMID 1396661.
  2. ^ Kikkawa U, Nishizuka Y, Igarashi K, Fujii T, Ono Y, Kuno T, Tanaka C (1989). "Phorbol ester binding to protein kinase C requires a cysteine-rich zinc-finger-like sequence". Proc. Natl. Acad. Sci. U.S.A. 86 (13): 4868–4871. doi:10.1073/pnas.86.13.4868. PMC 297516. PMID 2500657.

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