学术报告:AMulti-FunctionEnzymefortheRepairofDNADeamination

发布时间 :2011-06-12  阅读次数 :405

报告题目:A Multi-Function Enzyme for the Repair of DNA Deamination
报  告  人:Weiguo Cao, Associate Professor
Department of Genetics and Chemistry,
Clemson University, Clemson,SC 29634, USA
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报告时间:6月15日 下午2:00
报告地点:闵行校区分析测试中心321会议室
组织单位:微生物功能基因组学实验室
上海交通大学生命学院
Abstract
Endonuclease V is an enzyme that initiates a conserved DNA repair pathway by making an endonucleolytic incision at the 3'-side 1 nt from a deaminated base lesion. DNA cleavage analysis using mutants defective in DNA binding and Mn(2+) as a metal cofactor reveals a novel 3'-exonuclease activity in endonuclease V. This study defines the enzymatic nature of the endonuclease and exonuclease activity in endonuclease V from Thermotoga maritima. In addition to its well-known inosine-dependent endonuclease, Tma endonuclease V also exhibits inosine-dependent 3'-exonuclease activity. The dependence on an inosine site and the exonuclease nature of the 3'-exonuclease activity was demonstrated using 5'-labeled and internally-labeled inosine-containing DNA and a H214D mutant that is defective in non-specific nuclease activity. Detailed kinetic analysis using 3'-labeled DNA indicates that Tma endonuclease V also possesses non-specific 5'-exonuclease activity. The multiplicity of the endonuclease and exonuclease activity is discussed with respect to deaminated base repai

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