{"title":"<i>Escherichia coli</i> Orf135 (NudG) mutant protein specific for oxidized dATP.","authors":"Hiroyuki Kamiya","doi":"10.1080/15257770.2024.2413878","DOIUrl":null,"url":null,"abstract":"<p><p>Damaged 2'-deoxyribonucleotides cause mutations, cancer, cell death, and aging. The <i>Escherichia coli</i> Orf135 (NudG) protein catalyzes the hydrolysis of various 2'-deoxyribonucleotides including an oxidized form of dATP, 2-oxo-1,2-dihydro-2'-deoxyadenosine 5'-triphosphate (dA<sup>O</sup>TP, 2-hydroxy-2'-deoxyadenosine 5'-triphosphate). The best substrate is 5-methyl-2'-deoxycytidine 5'-triphosphate (dC<sup>m</sup>TP), and the protein prefers dC<sup>m</sup>TP over dA<sup>O</sup>TP by ∼200-fold in vitro. To make the enzyme specific for the mutagenic nucleotide dA<sup>O</sup>TP, a double mutant protein (E33A plus D118E) was designed and produced in <i>E. coli</i>. The purified mutant protein showed one order of magnitude higher dA<sup>O</sup>TP preference over dC<sup>m</sup>TP. The split protein based on this mutant may potentially be used to detect dA<sup>O</sup>TP in living cells.</p>","PeriodicalId":19343,"journal":{"name":"Nucleosides, Nucleotides & Nucleic Acids","volume":null,"pages":null},"PeriodicalIF":1.1000,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nucleosides, Nucleotides & Nucleic Acids","FirstCategoryId":"99","ListUrlMain":"https://doi.org/10.1080/15257770.2024.2413878","RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"BIOCHEMISTRY & MOLECULAR BIOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Damaged 2'-deoxyribonucleotides cause mutations, cancer, cell death, and aging. The Escherichia coli Orf135 (NudG) protein catalyzes the hydrolysis of various 2'-deoxyribonucleotides including an oxidized form of dATP, 2-oxo-1,2-dihydro-2'-deoxyadenosine 5'-triphosphate (dAOTP, 2-hydroxy-2'-deoxyadenosine 5'-triphosphate). The best substrate is 5-methyl-2'-deoxycytidine 5'-triphosphate (dCmTP), and the protein prefers dCmTP over dAOTP by ∼200-fold in vitro. To make the enzyme specific for the mutagenic nucleotide dAOTP, a double mutant protein (E33A plus D118E) was designed and produced in E. coli. The purified mutant protein showed one order of magnitude higher dAOTP preference over dCmTP. The split protein based on this mutant may potentially be used to detect dAOTP in living cells.
期刊介绍：
Nucleosides, Nucleotides & Nucleic Acids publishes research articles, short notices, and concise, critical reviews of related topics that focus on the chemistry and biology of nucleosides, nucleotides, and nucleic acids.
Complete with experimental details, this all-inclusive journal emphasizes the synthesis, biological activities, new and improved synthetic methods, and significant observations related to new compounds.
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