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A class C radical S-adenosylmethionine methyltransferase synthesizes 8-methylmenaquinone.

Hein, Sascha and Klimmek, Oliver and Polly, Markus and Kern, Melanie and Simon, Jörg (2017):
A class C radical S-adenosylmethionine methyltransferase synthesizes 8-methylmenaquinone.
104, In: Molecular microbiology, (3), pp. 449-462. ISSN 1365-2958,
[Article]

Abstract

The membranous quinone/quinol pool is essential to the majority of life forms and has been widely used as an important biomarker in microbial taxonomy. In the anaerobic world, the most important quinones are menaquinone (MK) and a methylated form of MK, designated methylmenaquinone (MMK), which is anticipated to serve specifically in low-potential electron transport chains involved in anaerobic respiration. However, it has remained unclear how MMK is generated. Here we show that a novel enzyme homologous to class C radical SAM methyltransferases (RSMTs) synthesizes MMK using MK as substrate. Such enzymes, termed either MenK or MqnK, are present in MMK-producing bacteria (and some archaea) that possess either the classical MK biosynthesis pathway (Men) or the futalosine pathway (Mqn). An mqnK deletion mutant of the model Epsilonproteobacterium Wolinella succinogenes was unable to produce MMK6 but its formation was restored upon genomic complementation using either the native mqnK gene or menK from the human gut bacterium Adlercreutzia equolifaciens or Shewanella oneidensis. Moreover, any of the menK genes enabled Escherichia coli cells to produce MMK8 and a methylated form of 2-demethylmenaquinone8 (DMK8 ). The results expand the knowledge on quinone synthesis and demonstrate an unprecedented function for a class C RSMT-type enzyme in primary cell metabolism. This article is protected by copyright. All rights reserved.

Item Type: Article
Erschienen: 2017
Creators: Hein, Sascha and Klimmek, Oliver and Polly, Markus and Kern, Melanie and Simon, Jörg
Title: A class C radical S-adenosylmethionine methyltransferase synthesizes 8-methylmenaquinone.
Language: English
Abstract:

The membranous quinone/quinol pool is essential to the majority of life forms and has been widely used as an important biomarker in microbial taxonomy. In the anaerobic world, the most important quinones are menaquinone (MK) and a methylated form of MK, designated methylmenaquinone (MMK), which is anticipated to serve specifically in low-potential electron transport chains involved in anaerobic respiration. However, it has remained unclear how MMK is generated. Here we show that a novel enzyme homologous to class C radical SAM methyltransferases (RSMTs) synthesizes MMK using MK as substrate. Such enzymes, termed either MenK or MqnK, are present in MMK-producing bacteria (and some archaea) that possess either the classical MK biosynthesis pathway (Men) or the futalosine pathway (Mqn). An mqnK deletion mutant of the model Epsilonproteobacterium Wolinella succinogenes was unable to produce MMK6 but its formation was restored upon genomic complementation using either the native mqnK gene or menK from the human gut bacterium Adlercreutzia equolifaciens or Shewanella oneidensis. Moreover, any of the menK genes enabled Escherichia coli cells to produce MMK8 and a methylated form of 2-demethylmenaquinone8 (DMK8 ). The results expand the knowledge on quinone synthesis and demonstrate an unprecedented function for a class C RSMT-type enzyme in primary cell metabolism. This article is protected by copyright. All rights reserved.

Journal or Publication Title: Molecular microbiology
Volume: 104
Number: 3
Divisions: 10 Department of Biology
10 Department of Biology > Microbial Energy Conversion and Biotechnology
Date Deposited: 13 Feb 2017 12:02
Identification Number: pmid:28164386
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