Cybip, a starfish cyclin B-binding protein, is involved in meiotic M-phase exit.

Abstract:

:We designed a screen to identify starfish oocyte proteins able to bind monomeric cyclin B by affinity chromatography on a cyclin B splice variant displaying low affinity for cdc2. We identified a 15kDa protein previously described as a cdk-binding protein [Biochim. Biophys. Acta Mol. Cell Res. 1589 (2002) 219-231]. Cybip is encoded by a single polymorphic gene and the native protein is matured by cleaving a signal peptide. We firmly establish the fact that it is a true cyclin B-binding protein, since the recombinant protein binds recombinant cyclin B in absence of any cdk. Finally, we show that the microinjection of GST-cybip, and of anti-cybip antibody, in maturing starfish oocytes, inhibits H1 kinase and MPF inactivation, and first polar body emission.

authors

Offner N,Derancourt J,Lozano JC,Schatt P,Picard A,Peaucellier G

doi

10.1016/s0006-291x(02)02797-3

subject

Has Abstract

pub_date

2003-01-03 00:00:00

pages

121-7

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006291X02027973

journal_volume

300

pub_type

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