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Deposition of Centromeric Histone H3 Variant CENP-A/Cse4 into Chromatin Is Facilitated by Its C-Terminal Sumoylation
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Deposition of Centromeric Histone H3 Variant CENP-A/Cse4 into Chromatin Is Facilitated by Its C-Terminal Sumoylation
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Deposition of Centromeric Histone H3 Variant CENP-A/Cse4 into Chromatin Is Facilitated by Its C-Terminal Sumoylation
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Journal Article
Deposition of Centromeric Histone H3 Variant CENP-A/Cse4 into Chromatin Is Facilitated by Its C-Terminal Sumoylation
2020
Overview
Abstract
Centromeric localization of CENP-A (Cse4 in Saccharomyces cerevisiae, CID in flies, CENP-A in humans) is essential for faithful chromosome segregation. Mislocalization of overexpressed CENP-A contributes to aneuploidy in yeast, flies, and humans, and is proposed to promote tumorigenesis in human cancers. Hence, defining molecular mechanisms that promote or prevent mislocalization of CENP-A is an area of active investigation. In budding yeast, evolutionarily conserved histone chaperones Scm3 and chromatin assembly factor-1 (CAF-1) promote localization of Cse4 to centromeric and noncentromeric regions, respectively. Ubiquitin ligases, such as Psh1 and Slx5, and histone chaperones (HIR complex) regulate proteolysis of overexpressed Cse4 and prevent its mislocalization to noncentromeric regions. In this study, we have identified sumoylation sites lysine (K) 215/216 in the C terminus of Cse4, and shown that sumoylation of Cse4 K215/216 facilitates its genome-wide deposition into chromatin when overexpressed. Our results showed reduced levels of sumoylation of mutant Cse4 K215/216R/A [K changed to arginine (R) or alanine (A)] and reduced interaction of mutant Cse4 K215/216R/A with Scm3 and CAF-1 when compared to wild-type Cse4. Consistent with these results, levels of Cse4 K215/216R/A in the chromatin fraction and localization to centromeric and noncentromeric regions were reduced. Furthermore, in contrast to GAL-CSE4, which exhibits Synthetic Dosage Lethality (SDL) in psh1∆, slx5∆, and hir2∆ strains, GAL-cse4 K215/216R does not exhibit SDL in these strains. Taken together, our results show that deposition of Cse4 into chromatin is facilitated by its C-terminal sumoylation.
Publisher
Oxford University Press,Genetics Society of America
Subject
/ Arginine
/ Chromatin Assembly Factor-1 - genetics
/ Chromatin Assembly Factor-1 - metabolism
/ Chromosomal Proteins, Non-Histone - chemistry
/ Chromosomal Proteins, Non-Histone - genetics
/ Chromosomal Proteins, Non-Histone - metabolism
/ DNA-Binding Proteins - chemistry
/ DNA-Binding Proteins - genetics
/ DNA-Binding Proteins - metabolism
/ Genetics
/ Genomes
/ Histones
/ Lysine
/ Mutants
/ Peptide Elongation Factors - genetics
/ Peptide Elongation Factors - metabolism
/ Plasmids
/ Proteins
/ Saccharomyces cerevisiae Proteins - chemistry
/ Saccharomyces cerevisiae Proteins - genetics
/ Saccharomyces cerevisiae Proteins - metabolism
/ Ubiquitin-Protein Ligases - genetics
/ Ubiquitin-Protein Ligases - metabolism
/ Yeast
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