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1: Eur J Biochem. 2001 Dec;268(23):6076-82.Click here to read Links

ik3-1/Cables is a substrate for cyclin-dependent kinase 3 (cdk 3).

Yamochi T, Semba K, Tsuji K, Mizumoto K, Sato H, Matsuura Y, Nishimoto I, Matsuoka M.

Department of Pharmacology, KEIO University School of Medicine, Tokyo, Japan.

p70ik3-1 (a 70-kDa protein) contains a cyclin box, and binds to p35cdk3 in vivo and in vitro [Matsuoka, M., Matsuura, Y., Semba, K. & Nishimoto, I. (2000) Biochem. Biophys. Res. Commun. 273, 442-447]. In spite of its structural similarity to cyclins, p70ik3-1 does not activate cyclin-dependent kinase 3 (cdk3)-mediated phosphorylation of pRb, histone H1, or the C-terminal domain of RNA polymerase II. Here, we report that Ser274 of p70ik3-1 is phosphorylated by cdk2 or cdk3 bound to cyclin A and to cyclin E in vitro. We also found that in COS7 cells in which cyclin E and cdk3 were ectopically overexpressed, the phosphorylation level of Ser274 in coexpressed p70ik3-1 is upregulated. We therefore conclude that p70ik3-1 is a substrate for cdk3-mediated phosphorylation.

PMID: 11733001 [PubMed - indexed for MEDLINE]