Molecular mechanism of poly(ADP-ribosyl)ation by PARP1 and identification of lysine residues as ADP-ribose acceptor sites.

Molecular mechanism of poly(ADP-ribosyl)ation by PARP1 and identification of lysine residues as ADP-ribose acceptor sites.
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DOI:
10.1093/nar/gkp229
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发表时间:
2009-06
影响因子:
14.9
通讯作者:
Hottiger MO
Hottiger MO
中科院分区:
生物学2区
文献类型:
--
作者:
Altmeyer M;Messner S;Hassa PO;Fey M;Hottiger MO

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聚(ADP-核糖)聚合酶1(PARP 1)以烟酰胺腺嘌呤二核苷酸(NAD)为底物合成聚(ADP-核糖)(PAR)。尽管对PARP 1的细胞功能进行了深入研究,但PAR形成的分子机制尚未得到全面了解。在这项研究中,我们阐明了聚(ADP-核糖基)化的分子机制,并确定PAR受体位点。不同嵌合体蛋白的产生揭示了PARP 1、PARP 2和PARP 3的氨基端结构域与其相应的催化结构域紧密合作。PARP 1的氨基端DNA结合结构域和催化结构域之间的DNA依赖性相互作用增加了NAD的Vmax,降低了Km。此外,我们表明,谷氨酸残基的PARP 1的自动修饰结构域是不需要PAR的形成。相反,我们确定个别赖氨酸残基作为ADP-核糖基化的受体位点。总之,我们的研究结果提供了新的PAR合成机制的见解与PARP家族成员的不同生物学功能的显着相关性。
Poly(ADP-ribose) polymerase 1 (PARP1) synthesizes poly(ADP-ribose) (PAR) using nicotinamide adenine dinucleotide (NAD) as a substrate. Despite intensive research on the cellular functions of PARP1, the molecular mechanism of PAR formation has not been comprehensively understood. In this study, we elucidate the molecular mechanisms of poly(ADP-ribosyl)ation and identify PAR acceptor sites. Generation of different chimera proteins revealed that the amino-terminal domains of PARP1, PARP2 and PARP3 cooperate tightly with their corresponding catalytic domains. The DNA-dependent interaction between the amino-terminal DNA-binding domain and the catalytic domain of PARP1 increased Vmax and decreased the Km for NAD. Furthermore, we show that glutamic acid residues in the auto-modification domain of PARP1 are not required for PAR formation. Instead, we identify individual lysine residues as acceptor sites for ADP-ribosylation. Together, our findings provide novel mechanistic insights into PAR synthesis with significant relevance for the different biological functions of PARP family members.
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