Securin and not CDK1/cyclin B1 regulates sister chromatid disjunction during meiosis II in mouse eggs

Title data

Nabti, Ibtissem ; Reis, Alexandra ; Levasseur, Mark ; Stemmann, Olaf ; Jones, Keith T.:
Securin and not CDK1/cyclin B1 regulates sister chromatid disjunction during meiosis II in mouse eggs.
In: Developmental Biology. Vol. 321 (2008) Issue 2 . - pp. 379-386.
ISSN 1095-564X
DOI: https://doi.org/10.1016/j.ydbio.2008.06.036

Official URL:

Abstract in another language

Mammalian eggs remain arrested at metaphase of the second meiotic division (metII) for an indeterminate time before fertilization. During this period, which can last several hours, the continued attachment of sister chromatids is thought to be achieved by inhibition of the protease separase. Separase is known to be inhibited by binding either securin or Maturation (M-Phase)-Promoting Factor, a heterodimer of CDK1/cyclin B1. However, the relative contribution of securin and CDK/cyclin B1 to sister chromatid attachment during metII arrest has not been assessed. Although there are conditions in which either CDK1/cyclinB1 activity or securin can prevent sister chromatid disjunction, principally by overexpression of non-degradable cyclin B1 or securin, we find here that separase activity is primarily regulated by securin and not CDK1/cyclin B1. Thus the CDK1 inhibitor roscovitine and an antibody we designed to block the interaction of CDK1/cyclin B1 with separase, both failed to induce sister disjunction. In contrast, securin morpholino knockdown specifically induced loss of sister attachment, that could be restored by securin cRNA rescue. During metII arrest separase appears primarily regulated by securin binding, not CDK1/cyclin B1.

Further data

Item Type:	Article in a journal
Refereed:	Yes
Institutions of the University:	Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Genetics > Chair Genetics - Univ.-Prof. Dr. Olaf Stemmann Profile Fields > Advanced Fields > Molecular Biosciences Research Institutions > Central research institutes > Bayreuth Center for Molecular Biosciences - BZMB Faculties Faculties > Faculty of Biology, Chemistry and Earth Sciences Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Genetics Profile Fields Profile Fields > Advanced Fields Research Institutions Research Institutions > Central research institutes
Result of work at the UBT:	No
DDC Subjects:	500 Science > 570 Life sciences, biology
Date Deposited:	26 Mar 2015 10:26
Last Modified:	04 Dec 2023 12:46
URI:	https://eref.uni-bayreuth.de/id/eprint/8538