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Plos Biology : the Ndr, Volume 6

By Mazanka, Emily

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Book Id: WPLBN0003929012
Format Type: PDF eBook :
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Reproduction Date: 2015

Title: Plos Biology : the Ndr, Volume 6  
Author: Mazanka, Emily
Volume: Volume 6
Language: English
Subject: Journals, Science, Biology
Collections: Periodicals: Journal and Magazine Collection, PLoS Biology
Historic
Publication Date:
Publisher: Plos

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Mazanka, E. (n.d.). Plos Biology : the Ndr, Volume 6. Retrieved from http://netlibrary.net/


Description
Description : Cell fate can be determined by asymmetric segregation of gene expression regulators. In the budding yeast Saccharomyces cerevisiae, the transcription factor Ace2 accumulates specifically in the daughter cell nucleus, where it drives transcription of genes that are not expressed in the mother cell. The NDR/LATS family protein kinase Cbk1 is required for Ace2 segregation and function. Using peptide scanning arrays, we determined Cbk19s phosphorylation consensus motif, the first such unbiased approach for an enzyme of this family, showing that it is a basophilic kinase with an unusual preference for histidine5 to the phosphorylation site. We found that Cbk1 phosphorylates such sites in Ace2, and that these modifications are critical for Ace29s partitioning and function. Using proteins marked with GFP variants, we found that Ace2 moves from isotropic distribution to the daughter cell nuclear localization, well before cytokinesis, and that the nucleus must enter the daughter cell for Ace2 accumulation to occur. We found that Cbk1, unlike Ace2, is restricted to the daughter cell. Using both in vivo and in vitro assays, we found that two critical Cbk1 phosphorylations block Ace29s interaction with nuclear export machinery, while a third distal modification most likely acts to increase the transcription factor’s activity. Our findings show that Cbk1 directly controls Ace2, regulating the transcription factor’s activity and interaction with nuclear export machinery through three phosphorylation sites. Furthermore, Cbk1 exhibits a novel specificity that is likely conserved among related kinases from yeast to metazoans. Cbk1 is functionally restricted to the daughter cell, and cannot diffuse from the daughter to the mother. In addition to providing a mechanism for Ace2 segregation, these findings show that an isotropically distributed cell fate determinant can be asymmetrically partitioned in cytoplasmically contiguous cells through spatial segregation of a regulating protein kinase.

 

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