Human AlkB homologue 1 (ABH1) exhibits DNA lyase activity at abasic sites.
Human AlkB homologue 1 (ABH1) exhibits DNA lyase activity at abasic sites.
复制标题
DOI:
10.1016/j.dnarep.2009.10.011
复制
发表时间:
2010-01-02
期刊:
影响因子:
3.8
通讯作者:
Hausinger RP
中科院分区:
文献类型:
--
作者:
Müller TA;Meek K;Hausinger RP
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.
登录
查看更多内容
影响因子:
2.5
作者:
Pan, Zishu;Sikandar, Shaheen;Lipkin, Steven M.
通讯作者:
Lipkin, Steven M.
影响因子:
16
作者:
Ougland, R;Zhang, CM;Falnes, PO
通讯作者:
Falnes, PO
影响因子:
4.8
作者:
Fitzgerald, Megan E.;Drohat, Alexander C.
通讯作者:
Drohat, Alexander C.
DOI:
10.1016/j.bbapap.2008.08.001
发表时间:
2008-11-01
影响因子:
3.2
作者:
Ilina, Ekaterina S.;Lavrik, Olga I.;Khodyreva, Svetlana N.
通讯作者:
Khodyreva, Svetlana N.
影响因子:
3.5
作者:
Jia, Guifang;Yang, Cai-Guang;Yang, Shangdong;Jian, Xing;Yi, Chengqi;Zhou, Zhiqiang;He, Chuan
通讯作者:
He, Chuan