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Localization to, and Effects of Pbp1, Pbp4, Lsm12, Dhh1, and Pab1 on Stress Granules in Saccharomyces cerevisiae
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Localization to, and Effects of Pbp1, Pbp4, Lsm12, Dhh1, and Pab1 on Stress Granules in Saccharomyces cerevisiae
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Journal Article
Localization to, and Effects of Pbp1, Pbp4, Lsm12, Dhh1, and Pab1 on Stress Granules in Saccharomyces cerevisiae
2010
Overview
The regulation of translation and mRNA degradation in eukaryotic cells involves the formation of cytoplasmic mRNP granules referred to as P-bodies and stress granules. The yeast Pbp1 protein and its mammalian ortholog, Ataxin-2, localize to stress granules and promote their formation. In Saccharomyces cerevisiae, Pbp1 also interacts with the Pab1, Lsm12, Pbp4, and Dhh1 proteins. In this work, we determined whether these Pbp1 interacting proteins also accumulated in stress granules and/or could affect their formation. These experiments revealed the following observations. First, the Lsm12, Pbp4, and Dhh1 proteins all accumulate in stress granules, whereas only the Dhh1 protein is a constitutive P-body component. Second, deletion or over-expression of the Pbp4 and Lsm12 proteins did not dramatically affect the formation of stress granules or P-bodies. In contrast, Pbp1 and Dhh1 over-expression inhibits cell growth, and for Dhh1, leads to the accumulation of stress granules. Finally, a strain lacking the Pab1 protein was reduced at forming stress granules, although they could still be detected. This indicates that Pab1 affects, but is not absolutely required for, stress granule formation. These observations offer new insight into the function of stress granule components with roles in stress granule assembly and mRNP regulation.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Ataxin
/ Carrier Proteins - metabolism
/ Carrier Proteins - physiology
/ Cytoplasmic Granules - metabolism
/ DEAD-box RNA Helicases - metabolism
/ DEAD-box RNA Helicases - physiology
/ Genes
/ Glucose
/ granules
/ mammals
/ Molecular Biology/mRNA Stability
/ Molecular Biology/mRNA Transport and Localization
/ Molecular Biology/Translational Regulation
/ mRNA
/ Poly(A)-Binding Proteins - metabolism
/ Poly(A)-Binding Proteins - physiology
/ Proteins
/ RNA
/ Saccharomyces cerevisiae - growth & development
/ Saccharomyces cerevisiae - metabolism
/ Saccharomyces cerevisiae - ultrastructure
/ Saccharomyces cerevisiae Proteins - metabolism
/ Saccharomyces cerevisiae Proteins - physiology
/ Stresses
/ Trends
/ Xenopus
/ Yeast
/ yeasts
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