Menaquinone Biosynthesis: Formation of Aminofutalosine Requires a Unique Radical SAM Enzyme
摘要:
Menaquinone (MK, vitamin K-2) is a lipid-soluble molecule that participates in the bacterial electron transport chain. In mammalian cells, MK functions as an essential vitamin for the activation of various proteins involved in blood clotting and bone metabolism. Recently, a new pathway for the biosynthesis of this cofactor was discovered in Streptomyces coelicolor A3(2) in which chorismate is converted to aminofutalosine in a reaction catalyzed by MqnA and an unidentified enzyme. Here, we reconstitute the biosynthesis of aminofutalosine and demonstrate that the missing enzyme (aminofutalosine synthase, MqnE) is a radical SAM enzyme that catalyzes the addition of the adenosyl radical to the double bond of 3-[(1-carboxyvinyl)oxy]benzoic acid. This is a new reaction type in the radical SAM superfamily.
Inhibition Studies of Mycobacterium tuberculosis Salicylate Synthase (MbtI)
作者:Alexandra Manos-Turvey、Esther M. M. Bulloch、Peter J. Rutledge、Edward N. Baker、J. Shaun Lott、Richard J. Payne
DOI:10.1002/cmdc.201000137
日期:——
Mycobacteriumtuberculosissalicylatesynthase (MbtI), a member of the chorismate‐utilizing enzyme family, catalyses the first committed step in the biosynthesis of the siderophore mycobactin T. This complex secondary metabolite is essential for both virulence and survival of M. tuberculosis, the etiological agent of tuberculosis (TB). It is therefore anticipated that inhibitors of this enzyme may
Aminofutalosine Synthase: Evidence for Captodative and Aryl Radical Intermediates Using β-Scission and S<sub>RN</sub>1 Trapping Reactions
作者:Sumedh Joshi、Nilkamal Mahanta、Dmytro Fedoseyenko、Howard Williams、Tadhg P. Begley
DOI:10.1021/jacs.7b04209
日期:2017.8.16
Aminofutalosine synthase (MqnE) is a radical SAM enzyme involved in the menaquinone biosynthetic pathway. In this communication, we propose a novel mechanism for this reaction involving the addition of the adenosyl radical to the substrate double bond to form a captodative radical followed by rearrangement and decarboxylation to form an arylradical anion which is then oxidized by the [4Fe-4S]+2 cluster
氨基二氢呋喃合酶 (MqnE) 是一种参与甲基萘醌生物合成途径的自由基 SAM 酶。在这篇通讯中,我们提出了该反应的新机制,包括将腺苷自由基添加到底物双键上以形成俘获自由基,然后重排和脱羧形成芳基阴离子,然后被 [4Fe-4S ]+2 集群。与该提议一致,我们描述了使用自由基触发的 C-Br 碎裂反应捕获俘获自由基和芳基自由基阴离子。我们还描述了通过用酰胺代替乙烯基羧酸来捕获俘获自由基。
[EN] COMPOUNDS AND METHODS FOR TREATMENT OF BACTERIAL INFECTIONS<br/>[FR] COMPOSÉS ET PROCÉDÉS POUR LE TRAITEMENT D'INFECTIONS BACTÉRIENNES
申请人:ALBERT EINSTEIN COLLEGE OF MEDICINE
公开号:WO2020236907A1
公开(公告)日:2020-11-26
This document discloses a novel class of compounds for inhibiting bacterial growth and treating bacterial infection. The compounds target a key step of the futalosine pathway and therefore are effective for the selective inhibition of certain bacterial species and genera with reduced side effect in comparison with conventional antibiotics.