Genetic Identification of Separase Regulators in Caenorhabditis elegans

G3: Genes, Genomes, Genetics

Michael Melesse^1¹ 

[1] Department of Biochemistry, Cellular and Molecular Biology, University of Tennessee, Knoxville, Tennessee 37996^1

关键词: separase;    PPH-5;    HSP-90;    suppressors;    C. elegans;   

DOI  :  10.1534/g3.117.300298

学科分类：生物科学（综合）

来源: Genetics Society of America

【 摘 要 】

Separase is a highly conserved protease required for chromosome segregation. Although observations that separase also regulates membrane trafficking events have been made, it is still not clear how separase achieves this function. Here, we present an extensive ENU mutagenesis suppressor screen aimed at identifying suppressors of sep-1 ( e2406 ) , a temperature-sensitive maternal effect embryonic lethal separase mutant that primarily attenuates membrane trafficking rather than chromosome segregation. We screened nearly a million haploid genomes and isolated 68 suppressed lines. We identified 14 independent intragenic sep-1 ( e2406 ) suppressed lines. These intragenic alleles map to seven SEP-1 residues within the N-terminus, compensating for the original mutation within the poorly conserved N-terminal domain. Interestingly, 47 of the suppressed lines have novel mutations throughout the entire coding region of the pph-5 phosphatase, indicating that this is an important regulator of separase. We also found that a mutation near the MEEVD motif of HSP-90 , which binds and activates PPH-5 , also rescues sep-1 ( e2406 ) mutants. Finally, we identified six potentially novel suppressor lines that fall into five complementation groups. These new alleles provide the opportunity to more exhaustively investigate the regulation and function of separase.

【 授权许可】

CC BY