Human AlkB homologue 1 (ABH1) exhibits DNA lyase activity at abasic sites.

Human AlkB homologue 1 (ABH1) exhibits DNA lyase activity at abasic sites.
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DOI:
10.1016/j.dnarep.2009.10.011
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发表时间:
2010-01-02
期刊:
影响因子:
3.8
通讯作者:
Hausinger RP
Hausinger RP
中科院分区:
医学3区
文献类型:
--
作者:
Müller TA;Meek K;Hausinger RP

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细菌AlkB和三种人类AlkB同系物(ABH 1、ABH 2和ABH 3)是Fe 2 +/2-酮戊二酸依赖性加氧酶,可直接修复烷基化损伤的DNA。在这里,我们发现ABH 1出乎意料地具有第二活性,在脱碱基(AP)位点切割DNA,例如那些自发产生的烷基化依赖的脱嘌呤反应。ABH 1的DNA切割活性不需要添加Fe 2+或2-酮戊二酸,不受EDTA抑制,并且不受推定的金属结合残基突变的影响,这表明该活性产生于与用于去甲基化的活性位点不同的活性位点。AP-特异性DNA切割显示通过裂解酶机制发生,而不是通过水解,酶保持与DNA产物相关。ABH 1可以在相对DNA链上的紧密间隔的AP位点处切割,从而在体外产生双链断裂,并且该反应可能与该意想不到的AP裂解酶活性的生理作用有关。
Bacterial AlkB and three human AlkB homologues (ABH1, ABH2, and ABH3) are Fe2+/2-oxoglutarate-dependent oxygenases that directly repair alkylation-damaged DNA. Here, we show that ABH1 unexpectedly has a second activity, cleaving DNA at abasic (AP) sites such as those arising spontaneously from alkylation-dependent depurination reactions. The DNA cleavage activity of ABH1 does not require added Fe2+ or 2-oxoglutarate, is not inhibited by EDTA, and is unaffected by mutation of the putative metal-binding residues, indicating that this activity arises from an active site distinct from that used for demethylation. AP-specific DNA cleavage was shown to occur by a lyase mechanism, rather than by hydrolysis, with the enzyme remaining associated with the DNA product. ABH1 can cleave at closely spaced AP sites on opposite DNA strands yielding double-strand breaks in vitro and this reaction may relate to the physiological role of this unexpected AP lyase activity.
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