| Modification Notes |
CCPG1 (cell cycle progression 1), also known as CPR8, is a 757 amino acid single-pass type II membrane protein that acts as an assembly platform for Rho protein signaling complexes. Involved in cell cycle regulation, CCPG1 limits guanine nucleotide exchange activity of Dbs, a Rho-specific guanine nucleotide exchange factor, toward Rho A, which results in an inhibition of both its transcriptional activation ability and its transforming activity. Considered a novel scaffold protein, CCPG1 exists as four isoforms produced by alternative splicing events. The gene encoding CCPG1 maps to human chromosome 15, which houses over 700 genes and comprises nearly 3% of the human genome. Angelman syndrome, Prader-Willi syndrome, Tay-Sachs disease and Marfan syndrome are all associated with defects in chromosome 15-localized genes. |