Dev Cell. 2007 Jan;12(1):157-66.

The Drosophila PNG kinase complex regulates the translation of cyclin B.

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Whitehead Institute, Massachusetts Institute of Technology, Cambridge, MA 02142, USA.

Abstract

The Drosophila PAN GU (PNG) kinase complex regulates the developmental translation of cyclin B. cyclin B mRNA becomes unmasked during oogenesis independent of PNG activity, but PNG is required for translation from egg activation. We find that although polyadenylation of cyclin B augments translation, it is not essential, and a fully elongated poly(A) is not required for translation to proceed. In fact, changes in poly(A) tail length are not sufficient to account for PNG-mediated control of cyclin B translation and of the early embryonic cell cycles. We present evidence that PNG functions instead as an antagonist of PUMILIO-dependent translational repression. Our data argue that changes in poly(A) tail length are not a universal mechanism governing embryonic cell cycles, and that PNG-mediated derepression of translation is an important alternative mechanism in Drosophila.

PMID:: 17199048; [PubMed - indexed for MEDLINE]

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The Drosophila PNG kinase complex regulates the translation of cyclin B.

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