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Poly(ADP-ribose) polymerase 2 localizes to mammalian active centromeres and interacts with PARP-1, Cenpa, Cenpb and Bub3, but not Cenpc.

Abstract：

:Poly(ADP-ribose) polymerase 2 (PARP-2) is a newly discovered member of the PARP family. We report the association of PARP-2 with mammalian centromeres in a cell-cycle-dependent manner, accumulating at centromeres during prometaphase and metaphase, disassociating during anaphase, and disappearing from the centromeres by telophase. Analysis of a pseudodicentric chromosome and a human neocentromere indicates that PARP-2 binding occurs only at active centromeres in a sequence-independent manner. Centromere binding peaks at the outer centromere region, and is significantly enhanced upon treatment with microtubule-inhibiting drugs. Co-immunoprecipitation assay demonstrates interaction between PARP-2 and its functional homolog PARP-1, constitutive centromere proteins Cenpa and Cenpb, and spindle checkpoint protein Bub3, but not with a third constitutive centromere protein Cenpc. These results, together with our previous demonstration that PARP-1 displays an identical binding pattern with Cenpa, Cenpb and Bub3, but not Cenpc, and that all three proteins undergo significant poly(ADP-ribosyl)ation upon gamma-irradiation of cells, point to possible diverse roles of PARP-2 and PARP-1 in modulating the structure and checkpoint functions of the mammalian centromere, in particular during radiation-induced DNA damage.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Saxena A,Wong LH,Kalitsis P,Earle E,Shaffer LG,Choo KH

doi

10.1093/hmg/11.19.2319

subject

Has Abstract

pub_date

2002-09-15 00:00:00

pages

2319-29

issue

19

eissn

0964-6906

issn

1460-2083

journal_volume

11

pub_type

杂志文章

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