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Mms21 SUMO Ligase Activity Promotes Nucleolar Function in Saccharomyces cerevisiae.

ABSTRACT: The budding yeast E3 SUMO ligase Mms21, also known as Nse2, is a component of the Smc5/6 complex, which regulates sister chromatid cohesion, DNA replication, and repair. Our study shows that the mms21RING? mutant exhibits (1) reduced ribosomal RNA production; (2) nuclear accumulation of ribosomal proteins; (3) elevated Gcn4 translation, indicating translational stress; and (4) upregulation of Gcn4 targets. Genes involved in ribosome biogenesis and translation are downregulated in the mms21RING? mutant. We identified RPL19A as a novel genetic suppressor of the mms21RING? mutant. Deletion of RPL19A partially suppresses growth defects in both smc5-6 and mms21RING? mutants as well as nuclear accumulation of ribosome subunits in the mms21RING? mutant. Deletion of a previously identified strong suppressor, MPH1, rescues both the accumulation of ribosome subunits and translational stress. This study suggests that the Smc5/6 complex supports nucleolar function.

SUBMITTER: Kim DH

PROVIDER: S-EPMC5068852 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature

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Mms21 SUMO Ligase Activity Promotes Nucleolar Function in Saccharomyces cerevisiae.

Kim Dong-Hwan DH Harris Bethany B Wang Fei F Seidel Chris C McCroskey Scott S Gerton Jennifer L JL

Genetics 20160810 2

The budding yeast E3 SUMO ligase Mms21, also known as Nse2, is a component of the Smc5/6 complex, which regulates sister chromatid cohesion, DNA replication, and repair. Our study shows that the mms21RINGΔ mutant exhibits (1) reduced ribosomal RNA production; (2) nuclear accumulation of ribosomal proteins; (3) elevated Gcn4 translation, indicating translational stress; and (4) upregulation of Gcn4 targets. Genes involved in ribosome biogenesis and translation are downregulated in the mms21RINGΔ ...[more]

PMID: 27510371

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