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用合成的过渡态类似物对碱基切除修复糖苷酶进行剖析。

Profiling base excision repair glycosylases with synthesized transition state analogs.

机构信息

Department of Chemistry, University of California, Davis, Building 143, One Shields Avenue, Davis, CA 95616, United States.

出版信息

Bioorg Med Chem Lett. 2011 Sep 1;21(17):4969-72. doi: 10.1016/j.bmcl.2011.05.085. Epub 2011 May 30.

Abstract

Two base excision repair glycosylase (BER) transition state (TS) mimics, (3R,4R)-1-benzyl (hydroxymethyl) pyrrolidin-3-ol (1NBn) and (3R,4R)-(hydroxymethyl) pyrrolidin-3-ol (1N), were synthesized using an improved method. Several BER glycosylases that repair oxidized DNA bases, bacterial formamidopyrimdine glycosylase (Fpg), human OG glycosylase (hOGG1) and human Nei-like glycosylase 1 (hNEIL1) exhibit exceptionally high affinity (K(d)∼pM) with DNA duplexes containing the 1NBn and 1N nucleotide. Notably, comparison of the K(d) values of both TS mimics relative to an abasic analog (THF) in duplex contexts paired opposite C or A suggest that these DNA repair enzymes use distinctly different mechanisms for damaged base recognition and catalysis despite having overlapping substrate specificities.

摘要

两种碱基切除修复糖苷酶(BER)过渡态(TS)模拟物,(3R,4R)-1-苄基(羟甲基)吡咯烷-3-醇(1NBn)和(3R,4R)-(羟甲基)吡咯烷-3-醇(1N),使用改进的方法合成。几种修复氧化 DNA 碱基的 BER 糖苷酶,如细菌的 formamidopyrimdine 糖苷酶(Fpg)、人 OG 糖苷酶(hOGG1)和人 Nei 样糖苷酶 1(hNEIL1),与含有 1NBn 和 1N 核苷酸的 DNA 双链体表现出极高的亲和力(Kd∼pM)。值得注意的是,将这两种 TS 模拟物的 Kd 值与在双链体背景下配对 C 或 A 的无碱基类似物(THF)进行比较表明,尽管这些 DNA 修复酶具有重叠的底物特异性,但它们使用截然不同的机制来识别和催化受损碱基。

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