Cited by 193Microtubule and mitosis dynamicsProtein Tyrosine PhosphatasesProtein Kinase Regulation and GTPase Signaling

A PP2A-B55 recognition signal controls substrate dephosphorylation kinetics during mitotic exit

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Cundell, Michael J., Hutter, Lukas H., Nunes Bastos, Ricardo, Poser, Elena, Holder, James, Mohammed, Shabaz, Novak, Bela, Barr, Francis A.·2016·Journal of Cell Biology

Abstract

PP2A-B55 is one of the major phosphatases regulating cell division. Despite its importance for temporal control during mitotic exit, how B55 substrates are recognized and differentially dephosphorylated is unclear. Using phosphoproteomics combined with kinetic modeling to extract B55-dependent rate constants, we have systematically identified B55 substrates and assigned their temporal order in mitotic exit. These substrates share a bipartite polybasic recognition determinant (BPR) flanking a Cdk1 phosphorylation site. Experiments and modeling show that dephosphorylation rate is encoded into B55 substrates, including its inhibitor ENSA, by cooperative action of basic residues within the BPR. A complementary acidic surface on B55 decodes this signal, supporting a cooperative electrostatic mechanism for substrate selection. A further level of specificity is encoded into B55 substrates because B55 displays selectivity for phosphothreonine. These simple biochemical properties, combined with feedback control of B55 activity by the phosphoserine-containing substrate/inhibitor ENSA, can help explain the temporal sequence of events during exit from mitosis.

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Crossref · 10.1083/jcb.201606033

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  • Dephosphorylation of selected substrates drives chromosome decondensation, nuclear envelope reformation, mitotic exit and cytokinesis.

    “As a result, dephosphorylation of specific substrates drives orderly events including chromosome decondensation and nuclear envelope reformation, leading to proper mitotic exit and cytokinesis (Cundell et al., 2016; Mehsen et al., 2018).”
  • B subunits bind the AC core dimer mutually exclusively and determine substrate specificity, regulation, subcellular localization and physiologic functions of trimeric PP2A complexes.

    “Given that they bind the core dimer in a mutually exclusive way, these regulatory subunits are known determinants of the substrate specificity, regulation and subcellular localization of the different PP2A holoenzymes, and, as such, largely determine the physiologic functions of the trimeric PP2A complexes [11,12].”
  • B-type subunits determine the function and regulation of PP2A trimers.

    “The Btype subunits determine function and regulation of PP2A trimers”

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Authors
Cundell, M. J., Hutter, L. H., Nunes Bastos, R., Poser, E., Holder, J., Mohammed, S., Novak, B., & Barr, F. A.
Affiliations
  • University of Oxford (GB)
  • Department of Biochemistry, University of Oxford, Oxford OX1 3QU, England, UK 1
Corresponding author
Barr, Francis A.
Venue
Journal of Cell Biology
Published
2016-08-22
Volume
214
Issue
5
Pages
539-554
ISSN
  • 0021-9525 (ISSN-L)
  • 1540-8140
OpenAlex
W2510568608
Cited by
193
References
44
Citations by year
2026: 16 · 2025: 15 · 2024: 13 · 2023: 20 · 2022: 15 · 2021: 25 · 2020: 29 · 2019: 26 · 2018: 21 · 2017: 10 · 2016: 3
FWCI
13.74
Type
journal article
Language
en
Open access
Licence
cc-by-nc-sa
Locations
  • The Journal of Cell Biology (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
Funders
  • Cancer Research UK (C20079/A15940)
  • Boehringer Ingelheim Fonds
  • Engineering and Physical Sciences Research Council (EPG03706X/1)
  • Wellcome Trust
  • Biotechnology and Biological Sciences Research Council (BB/M00354X/1)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Microtubule and mitosis dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
Keywords
PP2A-B55, mitotic exit, substrate recognition, CDK1 phosphorylation, ENSA, phosphatase substrate specificity, phosphoproteomics, kinetic modeling, feedback regulation
MeSH terms
Amino Acid Sequence, Amino Acids, Anaphase, Enzyme Inhibitors, HeLa Cells, Humans, Kinetics, Mitosis, Phosphorylation, Substrate Specificity, Time Factors, Cell Cycle Proteins, Amino Acid Motifs, Protein Subunits, Nuclear Pore, Nuclear Pore Complex Proteins, Protein Phosphatase 2, Static Electricity

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