期刊
CURRENT BIOLOGY
卷 21, 期 9, 页码 766-773出版社
CELL PRESS
DOI: 10.1016/j.cub.2011.03.047
关键词
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资金
- Fund for Scientific Research-Flanders [G.0478.08]
- Flemish Concerted Research Action [GOA 10/16]
- Prime Minister's office [IAP-P6/28P]
- cell imaging core of the K.U. Leuven
The transient mitotic histone H3 phosphorylation by various protein kinases regulates chromosome condensation and segregation, but the counteracting phosphatases have been poorly characterized [1-8]. We show here that PP1 gamma is the major histone H3 phosphatase acting on the mitotically phosphorylated (ph) residues H3T3ph, H3S10ph, H3T11ph, and H3S28ph. In addition, we identify Repo-Man, a chromosome-bound interactor of PP1 gamma [9], as a selective regulator of H3T3ph and H3T11ph dephosphorylation. Repo-Man promotes H3T11 ph dephosphorylation by an indirect mechanism but directly and specifically targets H3T3ph for dephosphorylation by associated PP1 gamma. The PP1 gamma/Repo-Man complex opposes the protein kinase Haspin-mediated spreading of H3T3ph to the chromosome arms until metaphase and catalyzes the net dephosphorylation of H3T3ph at the end of mitosis. Consistent with these findings, Repo-Man modulates in a PP1-dependent manner the H3T3ph-regulated chromosomal targeting of Aurora kinase B and its substrate MCAK. Our study defines a novel mechanism by which PP1 counteracts Aurora B.
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