Cited by 35Genomics and Chromatin DynamicsDNA Repair MechanismsProtein Tyrosine Phosphatases

MCM3-binding GANP DNA-primase is associated with a novel phosphatase component G5PR

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Kono, Yoshihiko, Maeda, Kazuhiko, Kuwahara, Kazuhiko, Yamamoto, Hideyuki, Miyamoto, Eishichi, Yonezawa, Kazuyoshi, Takagi, Katsumasa, Sakaguchi, Nobuo·2002·Genes to Cells

Abstract

BACKGROUND: GANP, carrying DNA-primase and MCM3-binding domains, is up-regulated in germinal centre B cells. To understand the regulatory function of GANP upon MCM complex, we searched for GANP-associated molecules by yeast two-hybrid screening. RESULTS: Using the 1 kb fragment (G5) of the ganp cDNA, we identified a clone named G5PR that is structurally homologous to known regulatory subunits of protein phosphatases (PPases) and determined the association of G5PR with GANP in vivo in the DNA transfectant. G5PR is associated with protein phosphatase 5 (PP5) through its tetratricopeptide-repeat (TPR) domain. Pull-down assays demonstrated that G5PR is also associated with protein phosphatase 2A (PP2A), the complex of A subunit (PR65) and the catalytic (C) subunit (PP2Ac), similar to the B" subunit. The G5PR-associated complex had phosphatase activity on casein, histone H1 and MCM3 in vitro, but the addition of G5PR did not stimulate or inhibit the phosphatase activities of PP5 and PP2A. The cellular localization of G5PR in transfected cells varies during cell cycling, appearing in the nucleus during prophase, in the peri-chromatin during mitotic phase, and in the cytoplasm after cell division. CONCLUSION: G5PR is capable of recruiting two kinds of PPases, PP5 and PP2A, into the GANP/MCM3 complex, which might regulate its phosphorylation state during cell cycle progression.

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Crossref · 10.1046/j.1365-2443.2002.00562.x

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Authors
Kono, Y., Maeda, K., Kuwahara, K., Yamamoto, H., Miyamoto, E., Yonezawa, K., Takagi, K., & Sakaguchi, N.
Affiliations
  • Kumamoto University (JP)
  • Japan Science and Technology Agency (JP)
  • Biosignal Research Center, Kobe University (JP)
Corresponding author
Sakaguchi, Nobuo
Venue
Genes to Cells
Publisher
Wiley
Published
2002-08
Volume
7
Issue
8
Pages
821-834
ISSN
  • 1356-9597 (ISSN-L)
  • 1365-2443
OpenAlex
W1582583383
Cited by
35
References
47
Citations by year
2024: 1 · 2022: 1 · 2021: 4 · 2019: 1 · 2018: 2 · 2017: 1 · 2016: 1 · 2015: 1 · 2013: 2 · 2012: 3
FWCI
1.04
Type
journal article
Language
en
Open access
Locations
  • Genes to Cells (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
Keywords
GANP, DNA primase, MCM3, protein phosphatase 5, protein phosphatase 2A, tetratricopeptide repeat domain, protein phosphorylation, cell cycle regulation, germinal center B cells, subcellular localization
MeSH terms
Acetyltransferases, Amino Acid Sequence, Animals, Base Sequence, DNA-Binding Proteins, Humans, Molecular Sequence Data, Nuclear Proteins, Phosphoprotein Phosphatases, Phosphoproteins, Transcription Factors, Blotting, Northern, Sequence Homology, Amino Acid, DNA, Complementary, Cell Cycle Proteins, Reverse Transcriptase Polymerase Chain Reaction, Intracellular Signaling Peptides and Proteins, Mice, Protein Phosphatase 2, Minichromosome Maintenance Complex Component 3

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