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FEBS Lett. 2006 Jan 9;580(1):336-40. Epub 2005 Dec 19.

Arabidopsis KRPs have distinct inhibitory activity toward cyclin D2-associated kinases, including plant-specific B-type cyclin-dependent kinase.

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1
Graduate School of Biological Sciences, Nara Institute of Science and Technology (NAIST), Takayama 8916-5, Ikoma, Nara 630-0101, Japan.

Abstract

Arabidopsis contains seven Kip-related protein (KRP) genes encoding CDK (cyclin-dependent kinase) inhibitors (CKIs), which shares a restricted similarity with mammalian p27Kip1. Here, we analyze the characteristics of the KRPs. Although KRP1-KRP7 interact with active cyclin D2 (CYCD2)/CDKA and CYCD2/CDKB complexes to a similar extent, they inhibit kinase activity to a different extent. Our results suggest that inhibitory activity is related to the binding ability between KRP proteins and cyclin/CDK complexes, but secondary and tertiary structure may be also involved. These data provide the first evidence that KRPs inhibit kinase activity associated with plant-specific CDKB.

PMID:
16376885
DOI:
10.1016/j.febslet.2005.12.018
[Indexed for MEDLINE]
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