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Folate binding site of flavin-dependent thymidylate synthase

机译:黄素依赖性胸苷酸合酶的叶酸结合位点

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摘要

The DNA nucleotide thymidylate is synthesized by the enzyme thymidylate synthase, which catalyzes the reductive methylation of deoxyuridylate using the cofactor methylene-tetrahydrofolate (CH_2H_4folate). Most organisms, including humans, rely on the thyA- or TYMS-encoded classic thymidylate synthase, whereas, certain microorganisms, including all Rickettsia and other pathogens, use an alternative thyX-encoded flavin-dependent thymidylate synthase (FDTS). Although several crystal structures of FDTSs have been reported, the absence of a structure with folates limits understanding of the molecular mechanism and the scope of drug design for these enzymes. Here we present X-ray crystal structures of FDTS with several folate derivatives, which together with mu-tagenesis, kinetic analysis, and computer modeling shed light on the cofactor binding and function. The unique structural data will likely facilitate further elucidation of FDTSs' mechanism and the design of structure-based inhibitors as potential leads to new antimicrobial drugs.
机译:DNA核苷酸胸苷酸是由胸苷酸合酶合成的,该酶使用辅因子亚甲基四氢叶酸(CH_2H_4叶酸)催化脱氧尿苷的还原甲基化。包括人类在内的大多数生物都依赖thyA或TYMS编码的经典胸苷酸合酶,而某些微生物,包括所有立克次氏体和其他病原体,都使用另一种thyX编码的黄素依赖性胸苷酸合酶(FDTS)。尽管已经报道了FDTS的几种晶体结构,但缺乏叶酸结构限制了对这些酶的分子机理和药物设计范围的了解。在这里,我们介绍了具有几种叶酸衍生物的FDTS的X射线晶体结构,以及诱变,动力学分析和计算机建模,为辅因子的结合和功能提供了线索。独特的结构数据可能会有助于进一步阐明FDTS的机理,以及基于结构的抑制剂的设计,因为潜在的抗微生物新药可能会产生。

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