Human chromosome segregation involves multi-layered regulation of separase by the peptidyl-prolyl-isomerase Pin1

Ring shaped cohesin keeps sister chromatids paired until cleavage of its Scc1/Rad21 subunit by separase triggers chromosome segregation in anaphase. Vertebrate separase is held inactive by mutually exclusive binding to securin or Cdk1-cyclin B1 and becomes unleashed only upon ubiquitin dependent deg...

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Published inMolecular cell Vol. 58; no. 3; pp. 495 - 506
Main Authors Hellmuth, Susanne, Rata, Scott, Brown, Andreas, Heidmann, Stefan, Novak, Bela, Stemmann, Olaf
Format Journal Article
LanguageEnglish
Published United States Elsevier Inc 07.05.2015
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Abstract Ring shaped cohesin keeps sister chromatids paired until cleavage of its Scc1/Rad21 subunit by separase triggers chromosome segregation in anaphase. Vertebrate separase is held inactive by mutually exclusive binding to securin or Cdk1-cyclin B1 and becomes unleashed only upon ubiquitin dependent degradation of these regulators. Although most separase is usually found in association with securin, this anaphase inhibitor is dispensable for murine life while Cdk1-cyclin B1 dependent control of separase is essential. Here, we show that securin independent inhibition of separase by Cdk1-cyclin B1 in early mitosis requires the phosphorylation specific peptidyl-prolyl cis/trans isomerase Pin1. Furthermore, isomerization of previously securin bound separase at the metaphase-to-anaphase transition renders it resistant to re-inhibition by residual securin. At the same time, isomerization also limits the half-life of separase's proteolytic activity, explaining how cohesin can be reloaded onto telophase chromatin in the absence of securin and cyclin B1 without being cleaved. [Display omitted] •Separase is subject to native-state cis/trans isomerization by Pin1•Once liberated, separase is rendered resistant to remaining securin by Pin1•When securin is limiting, Pin1 is required for control of separase by Cdk1-cyclin B1•Isomerization limits the half-life of separase's proteolytic activity in late mitosis
AbstractList Ring shaped cohesin keeps sister chromatids paired until cleavage of its Scc1/Rad21 subunit by separase triggers chromosome segregation in anaphase. Vertebrate separase is held inactive by mutually exclusive binding to securin or Cdk1-cyclin B1 and becomes unleashed only upon ubiquitin dependent degradation of these regulators. Although most separase is usually found in association with securin, this anaphase inhibitor is dispensable for murine life while Cdk1-cyclin B1 dependent control of separase is essential. Here, we show that securin independent inhibition of separase by Cdk1-cyclin B1 in early mitosis requires the phosphorylation specific peptidyl-prolyl cis/trans isomerase Pin1. Furthermore, isomerization of previously securin bound separase at the metaphase-to-anaphase transition renders it resistant to re-inhibition by residual securin. At the same time, isomerization also limits the half-life of separase's proteolytic activity, explaining how cohesin can be reloaded onto telophase chromatin in the absence of securin and cyclin B1 without being cleaved. [Display omitted] •Separase is subject to native-state cis/trans isomerization by Pin1•Once liberated, separase is rendered resistant to remaining securin by Pin1•When securin is limiting, Pin1 is required for control of separase by Cdk1-cyclin B1•Isomerization limits the half-life of separase's proteolytic activity in late mitosis
Ring-shaped cohesin keeps sister chromatids paired until cleavage of its Scc1/Rad21 subunit by separase triggers chromosome segregation in anaphase. Vertebrate separase is held inactive by mutually exclusive binding to securin or Cdk1-cyclin B1 and becomes unleashed only upon ubiquitin-dependent degradation of these regulators. Although most separase is usually found in association with securin, this anaphase inhibitor is dispensable for murine life while Cdk1-cyclin B1-dependent control of separase is essential. Here, we show that securin-independent inhibition of separase by Cdk1-cyclin B1 in early mitosis requires the phosphorylation-specific peptidyl-prolyl cis/trans isomerase Pin1. Furthermore, isomerization of previously securin-bound separase at the metaphase-to-anaphase transition renders it resistant to re-inhibition by residual securin. At the same time, isomerization also limits the half-life of separase's proteolytic activity, explaining how cohesin can be reloaded onto telophase chromatin in the absence of securin and cyclin B1 without being cleaved.
Author Heidmann, Stefan
Rata, Scott
Hellmuth, Susanne
Novak, Bela
Brown, Andreas
Stemmann, Olaf
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Snippet Ring shaped cohesin keeps sister chromatids paired until cleavage of its Scc1/Rad21 subunit by separase triggers chromosome segregation in anaphase. Vertebrate...
Ring-shaped cohesin keeps sister chromatids paired until cleavage of its Scc1/Rad21 subunit by separase triggers chromosome segregation in anaphase. Vertebrate...
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SubjectTerms anaphase
Anaphase - genetics
CDC2 Protein Kinase
chromatids
Chromatids - genetics
chromatin
chromosome segregation
Chromosome Segregation - genetics
Cyclin B1 - chemistry
Cyclin B1 - genetics
Cyclin B1 - metabolism
Cyclin-Dependent Kinases - chemistry
Cyclin-Dependent Kinases - genetics
Cyclin-Dependent Kinases - metabolism
cyclins
enzyme inhibition
Gene Expression Regulation, Enzymologic
half life
HEK293 Cells
Humans
Immunoblotting
isomerases
isomerization
Metaphase - genetics
mice
Microscopy, Fluorescence
mitosis
Mitosis - genetics
Models, Genetic
Models, Molecular
Mutation
NIMA-Interacting Peptidylprolyl Isomerase
Peptidylprolyl Isomerase - genetics
Peptidylprolyl Isomerase - metabolism
phosphorylation
Protein Binding
Protein Conformation
proteolysis
RNA Interference
Securin - genetics
Securin - metabolism
separase
Separase - chemistry
Separase - genetics
Separase - metabolism
telophase
ubiquitin
Title Human chromosome segregation involves multi-layered regulation of separase by the peptidyl-prolyl-isomerase Pin1
URI https://dx.doi.org/10.1016/j.molcel.2015.03.025
https://www.ncbi.nlm.nih.gov/pubmed/25921067
https://www.proquest.com/docview/1680208642
https://www.proquest.com/docview/2221055126
Volume 58
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