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Title: Methanosarcina acetivorans contains a functional ISC system for iron-sulfur cluster biogenesis

Abstract

Abstract Background The production of methane by methanogens is dependent on numerous iron-sulfur (Fe-S) cluster proteins; yet, the machinery involved in Fe-S cluster biogenesis in methanogens remains largely unknown. Methanogen genomes encode uncharacterized homologs of the core components of the ISC (IscS and IscU) and SUF (SufBC) Fe-S cluster biogenesis systems found in bacteria and eukaryotes. Methanosarcina acetivorans contains three iscSU and two sufCB gene clusters. Here, we report genetic and biochemical characterization of M. acetivorans iscSU2 . Results Purified IscS2 exhibited pyridoxal 5′- phosphate-dependent release of sulfur from L-cysteine. Incubation of purified IscU2 with IscS2, cysteine, and iron (Fe 2+ ) resulted in the formation of [4Fe-4S] clusters in IscU2. IscU2 transferred a [4Fe-4S] cluster to purified M. acetivorans apo-aconitase. IscU2 also restored the aconitase activity in air-exposed M. acetivorans cell lysate. These biochemical results demonstrate that IscS2 is a cysteine desulfurase and that IscU2 is a Fe-S cluster scaffold. M. acetivorans strain DJL60 deleted of iscSU2 was generated to ascertain the in vivo importance of IscSU2. Strain DJL60 had Fe-S cluster content and growth similar to the parent strain but lower cysteine desulfurase activity. Strain DJL60 also had lower intracellular persulfide content compared to the parent strain whenmore » cysteine was an exogenous sulfur source, linking IscSU2 to sulfur metabolism. Conclusions This study establishes that M. acetivorans contains functional IscS and IscU, the core components of the ISC Fe-S cluster biogenesis system and provides the first evidence that ISC operates in methanogens.« less

Authors:
; ; ; ; ORCiD logo
Publication Date:
Research Org.:
Univ. of Arkansas, Fayetteville, AR (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)
OSTI Identifier:
1686195
Alternate Identifier(s):
OSTI ID: 1852947
Grant/Contract Number:  
SC0019226; MCB1817819; NNX12AR60G
Resource Type:
Published Article
Journal Name:
BMC Microbiology
Additional Journal Information:
Journal Name: BMC Microbiology Journal Volume: 20 Journal Issue: 1; Journal ID: ISSN 1471-2180
Publisher:
Springer Science + Business Media
Country of Publication:
United Kingdom
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; Microbiology

Citation Formats

Deere, Thomas M., Prakash, Divya, Lessner, Faith H., Duin, Evert C., and Lessner, Daniel J. Methanosarcina acetivorans contains a functional ISC system for iron-sulfur cluster biogenesis. United Kingdom: N. p., 2020. Web. doi:10.1186/s12866-020-02014-z.
Deere, Thomas M., Prakash, Divya, Lessner, Faith H., Duin, Evert C., & Lessner, Daniel J. Methanosarcina acetivorans contains a functional ISC system for iron-sulfur cluster biogenesis. United Kingdom. https://doi.org/10.1186/s12866-020-02014-z
Deere, Thomas M., Prakash, Divya, Lessner, Faith H., Duin, Evert C., and Lessner, Daniel J. Fri . "Methanosarcina acetivorans contains a functional ISC system for iron-sulfur cluster biogenesis". United Kingdom. https://doi.org/10.1186/s12866-020-02014-z.
@article{osti_1686195,
title = {Methanosarcina acetivorans contains a functional ISC system for iron-sulfur cluster biogenesis},
author = {Deere, Thomas M. and Prakash, Divya and Lessner, Faith H. and Duin, Evert C. and Lessner, Daniel J.},
abstractNote = {Abstract Background The production of methane by methanogens is dependent on numerous iron-sulfur (Fe-S) cluster proteins; yet, the machinery involved in Fe-S cluster biogenesis in methanogens remains largely unknown. Methanogen genomes encode uncharacterized homologs of the core components of the ISC (IscS and IscU) and SUF (SufBC) Fe-S cluster biogenesis systems found in bacteria and eukaryotes. Methanosarcina acetivorans contains three iscSU and two sufCB gene clusters. Here, we report genetic and biochemical characterization of M. acetivorans iscSU2 . Results Purified IscS2 exhibited pyridoxal 5′- phosphate-dependent release of sulfur from L-cysteine. Incubation of purified IscU2 with IscS2, cysteine, and iron (Fe 2+ ) resulted in the formation of [4Fe-4S] clusters in IscU2. IscU2 transferred a [4Fe-4S] cluster to purified M. acetivorans apo-aconitase. IscU2 also restored the aconitase activity in air-exposed M. acetivorans cell lysate. These biochemical results demonstrate that IscS2 is a cysteine desulfurase and that IscU2 is a Fe-S cluster scaffold. M. acetivorans strain DJL60 deleted of iscSU2 was generated to ascertain the in vivo importance of IscSU2. Strain DJL60 had Fe-S cluster content and growth similar to the parent strain but lower cysteine desulfurase activity. Strain DJL60 also had lower intracellular persulfide content compared to the parent strain when cysteine was an exogenous sulfur source, linking IscSU2 to sulfur metabolism. Conclusions This study establishes that M. acetivorans contains functional IscS and IscU, the core components of the ISC Fe-S cluster biogenesis system and provides the first evidence that ISC operates in methanogens.},
doi = {10.1186/s12866-020-02014-z},
journal = {BMC Microbiology},
number = 1,
volume = 20,
place = {United Kingdom},
year = {Fri Oct 23 00:00:00 EDT 2020},
month = {Fri Oct 23 00:00:00 EDT 2020}
}

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