DNA uracil repair initiated by the archaeal ExoIII homologue Mth212 via direct strand incision.

DNA uracil repair initiated by the archaeal ExoIII homologue Mth212 via direct strand incision.
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DOI:
10.1093/nar/gkp102
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发表时间:
2009-04
影响因子:
14.9
通讯作者:
Fritz HJ
Fritz HJ
中科院分区:
生物学2区
文献类型:
--
作者:
Schomacher L;Chong JP;McDermott P;Kramer W;Fritz HJ

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在嗜热甲烷杆菌ΔH的基因组中不存在任何已知的UDG超家族尿嘧啶DNA糖基化酶的基因,这使得很难想象DNA-U修复如何在这种生物体中启动。最近,Mth 212,M.热自养菌ΔH是一种DNA尿嘧啶核酸内切酶,这表明DNA尿嘧啶修复可能是一种新的核酸内切进入机制。由于没有可用的遗传实验系统,这个问题是用生物化学方法解决的。体外DNA尿嘧啶修复试验,由粗细胞提取物促进,提供了明确的证实,这一机制确实在M。热自养菌ΔH.
No genes for any of the known uracil DNA glycosylases of the UDG superfamily are present in the genome of Methanothermobacter thermautotrophicus ΔH, making it difficult to imagine how DNA-U repair might be initiated in this organism. Recently, Mth212, the ExoIII homologue of M. thermautotrophicus ΔH has been characterized as a DNA uridine endonuclease, which suggested the possibility of a novel endonucleolytic entry mechanism for DNA uracil repair. With no system of genetic experimentation available, the problem was approached biochemically. Assays of DNA uracil repair in vitro, promoted by crude cellular extracts, provide unequivocal confirmation that this mechanism does indeed operate in M. thermautotrophicus ΔH.
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