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A Consensus Binding Motif for the PP4 Protein Phosphatase.

Yumi Ueki1, Thomas Kruse1, Melanie Bianca Weisser1

  • 1Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.

Molecular Cell
|October 6, 2019
PubMed
Summary

Researchers discovered a general FxxP motif that controls substrate selection for Phosphoprotein phosphatase 4 (PP4). This finding clarifies PP4

Keywords:
EVH1 domainPP4SLiMWAPLcohesinprotein phosphatase

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Dynamic protein phosphorylation is a key regulatory mechanism in cells.
  • Phosphoprotein phosphatase 4 (PP4) is an essential nuclear phosphatase, but its substrate specificity remains poorly understood.
  • Understanding PP4 substrate selection is crucial for deciphering phosphorylation-mediated signaling pathways.

Purpose of the Study:

  • To identify and characterize the general principles governing PP4 substrate recognition.
  • To elucidate the molecular basis of PP4-substrate interactions.
  • To uncover novel PP4 substrates and their functions.

Main Methods:

  • In silico analysis of protein sequences to identify potential binding motifs.
  • X-ray crystallography to determine the structural basis of motif-protein interaction.
  • Proteomic analysis to identify PP4-interacting proteins in vivo.
  • Functional studies of identified substrates, such as WAPL.

Main Results:

  • Identification and characterization of a conserved FxxP motif as a general PP4 consensus-binding motif.
  • X-ray crystallography revealed that FxxP motifs bind to a specific pocket in the PP4 regulatory subunit PPP4R3.
  • System-wide searches and proteomic data identified numerous FxxP motifs in proteins involved in diverse cellular processes.
  • An FxxP motif in WAPL was shown to regulate its phosphorylation and cohesin release, a critical step in cell division.

Conclusions:

  • The FxxP motif represents a fundamental principle of PP4 substrate specificity.
  • This discovery provides a framework for understanding PP4 function in various cellular contexts.
  • The findings have broad implications for research into phosphorylation signaling and related diseases.