Cyclin D-Type Binding Protein 1 (CCNDBP1)

CCNDBP1 was identified by the interaction of its gene product with Grap2, a leukocyte-specific adaptor protein important for immune cell signaling. The protein encoded by this gene was shown to interact with cyclin D. Transfection of this gene in cells was reported to reduce the phosphorylation of Rb gene product by cyclin D-dependent protein kinase, and inhibit E2F1-mediated transcription activity.

This protein was also found to interact with helix-loop-helix protein E12 and is thought to be a negative regulator of liver-specific gene expression. Two alternatively spliced variants, which encode distinct isoforms, have been reported. CCNDBP1 encodes a deduced 360-amino acid protein with a calculated molecular mass of 40 kD.