Design, Synthesis, and Evaluation of Acyclic <i>C-</i>Nucleoside and <i>N</i>-Methylated Derivatives of the Ribitylaminopyrimidine Substrate of Lumazine Synthase as Potential Enzyme Inhibitors and Mechanistic Probes
作者:Jinhua Chen、Thota Sambaiah、Boris Illarionov、Markus Fischer、Adelbert Bacher、Mark Cushman
DOI:10.1021/jo048975f
日期:2004.10.1
abolished the affinity for lumazine synthase, thus revealing a critical, yet unexplained, role of the ribitylamino N−H moiety in conferring affinity for the enzyme. In contrast, the N−CH3 replacement resulted in an inhibitor of both lumazine synthase and riboflavin synthase. Replacement of the ribitylamino N−H moiety with epimeric C−F moieties led to inhibition of lumazine synthase and riboflavin synthase
Lumazine合酶和核黄素合酶催化核黄素的生物合成的最后两个步骤。核黄素是一种维生素,它参与许多对维持生命至关重要的重要生化反应。为了获得可用于研究结合的反应中间体的结构的抑制剂和结构探针,用CH 2和N-CH 3基团取代了azine嗪合酶底物的核糖胺基N-H部分。CH 2替换出乎意料并完全废除了对lumazine合酶的亲和力,因此揭示了核糖胺基N-H部分在赋予酶亲和力方面的关键但无法解释的作用。相反,N-CH 3置换产生了lumazine合酶和核黄素合酶的抑制剂。当将5-氨基基团用硝基取代基取代时,用差向性CF基团取代核糖基氨基NH部分导致抑制了azine嗪合酶和核黄素合酶。