報告題目：A Multi-Function Enzyme for the Repair of DNA Deamination
報  告  人：Weiguo Cao, Associate Professor
Department of Genetics and Chemistry,
Clemson University, Clemson,SC 29634, USA
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報告時間🦄：6月15日 下午2：00
報告地點🧜🏻‍♀️：閔行校區分析測試中心321會議室
組織單位🙎🏿‍♂️：微生物功能基因組學實驗室
EON体育4平台
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