Stress and Developmental Regulation of the Yeast C-type Cyclin Ume3p (Srb11p/Ssn8p)

Overview

Journal EMBO J

Specialties Biotechnology
Molecular Biology

Date 1997 Aug 1

PMID 9303311

Citations 59

Authors

K F Cooper

M J Mallory

J B Smith

R Strich

Affiliations

Soon will be listed here.

Abstract

The ume3-1 allele was identified as a mutation that allowed the aberrant expression of several meiotic genes (e.g. SPO11, SPO13) during mitotic cell division in Saccharomyces cerevisiae. Here we report that UME3 is also required for the full repression of the HSP70 family member SSA1. UME3 encodes a non-essential C-type cyclin (Ume3p) whose levels do not vary through the mitotic cell cycle. However, Ume3p is destroyed during meiosis or when cultures are subjected to heat shock. Ume3p mutants resistant to degradation resulted in a 2-fold reduction in SPO13 mRNA levels during meiosis, indicating that the down-regulation of this cyclin is important for normal meiotic gene expression. Mutational analysis identified two regions (PEST-rich and RXXL) that mediate Ume3p degradation. A third destruction signal lies within the highly conserved cyclin box, a region that mediates cyclin-cyclin-dependent kinase (Cdk) interactions. However, the Cdk activated by Ume3p (Ume5p) is not required for the rapid destruction of this cyclin. Finally, Ume3p destruction was not affected in mutants defective for ubiquitin-dependent proteolysis. These results support a model in which Ume3p, when exposed to heat shock or sporulation conditions, is targeted for destruction to allow the expression of genes necessary for the cell to respond correctly to these environmental cues.

Citing Articles

The CDK8 kinase module: A novel player in the transcription of translation initiation and ribosomal genes.

Friedson B, Willis S, Shcherbik N, Campbell A, Cooper K Mol Biol Cell. 2024; 36(1):ar2.

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Med13 is required for efficient P-body recruitment and autophagic degradation of Edc3 following nitrogen starvation.

Hanley S, Willis S, Friedson B, Cooper K Mol Biol Cell. 2024; 35(11):ar142.

PMID: 39320938 PMC: 11617093. DOI: 10.1091/mbc.E23-12-0470.

Cdk8/CDK19 promotes mitochondrial fission through Drp1 phosphorylation and can phenotypically suppress pink1 deficiency in Drosophila.

Liao J, Chung H, Shih C, Wong K, Dutta D, Nil Z Nat Commun. 2024; 15(1):3326.

PMID: 38637532 PMC: 11026413. DOI: 10.1038/s41467-024-47623-8.

Ksp1 is an autophagic receptor protein for the Snx4-assisted autophagy of Ssn2/Med13.

Hanley S, Willis S, Doyle S, Strich R, Cooper K Autophagy. 2023; 20(2):397-415.

PMID: 37733395 PMC: 10813586. DOI: 10.1080/15548627.2023.2259708.

Substrates of the MAPK Slt2: Shaping Yeast Cell Integrity.

Gonzalez-Rubio G, Sastre-Vergara L, Molina M, Martin H, Fernandez-Acero T J Fungi (Basel). 2022; 8(4).

PMID: 35448599 PMC: 9031059. DOI: 10.3390/jof8040368.

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