Structure of the respiratory MBS complex reveals iron-sulfur cluster catalyzed sulfane sulfur reduction in ancient life
Abstract
Abstract Modern day aerobic respiration in mitochondria involving complex I converts redox energy into chemical energy and likely evolved from a simple anaerobic system now represented by hydrogen gas-evolving hydrogenase (MBH) where protons are the terminal electron acceptor. Here we present the cryo-EM structure of an early ancestor in the evolution of complex I, the elemental sulfur (S 0 )-reducing reductase MBS. Three highly conserved protein loops linking cytoplasmic and membrane domains enable scalable energy conversion in all three complexes. MBS contains two proton pumps compared to one in MBH and likely conserves twice the energy. The structure also reveals evolutionary adaptations of MBH that enabled S 0 reduction by MBS catalyzed by a site-differentiated iron-sulfur cluster without participation of protons or amino acid residues. This is the simplest mechanism proposed for reduction of inorganic or organic disulfides. It is of fundamental significance in the iron and sulfur-rich volcanic environments of early earth and possibly the origin of life. MBS provides a new perspective on the evolution of modern-day respiratory complexes and of catalysis by biological iron-sulfur clusters.
- Authors:
- Publication Date:
- Research Org.:
- Univ. of Georgia, Athens, GA (United States)
- Sponsoring Org.:
- USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
- OSTI Identifier:
- 1777519
- Alternate Identifier(s):
- OSTI ID: 1779857
- Grant/Contract Number:
- FG02-95ER20175; SC0020085
- Resource Type:
- Published Article
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Name: Nature Communications Journal Volume: 11 Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; Respiration; Catalysis; Hydrogen sulfide; Iron-sulfur cluster.
Citation Formats
Yu, Hongjun, Haja, Dominik K., Schut, Gerrit J., Wu, Chang-Hao, Meng, Xing, Zhao, Gongpu, Li, Huilin, and Adams, Michael W. W. Structure of the respiratory MBS complex reveals iron-sulfur cluster catalyzed sulfane sulfur reduction in ancient life. United Kingdom: N. p., 2020.
Web. doi:10.1038/s41467-020-19697-7.
Yu, Hongjun, Haja, Dominik K., Schut, Gerrit J., Wu, Chang-Hao, Meng, Xing, Zhao, Gongpu, Li, Huilin, & Adams, Michael W. W. Structure of the respiratory MBS complex reveals iron-sulfur cluster catalyzed sulfane sulfur reduction in ancient life. United Kingdom. https://doi.org/10.1038/s41467-020-19697-7
Yu, Hongjun, Haja, Dominik K., Schut, Gerrit J., Wu, Chang-Hao, Meng, Xing, Zhao, Gongpu, Li, Huilin, and Adams, Michael W. W. Mon .
"Structure of the respiratory MBS complex reveals iron-sulfur cluster catalyzed sulfane sulfur reduction in ancient life". United Kingdom. https://doi.org/10.1038/s41467-020-19697-7.
@article{osti_1777519,
title = {Structure of the respiratory MBS complex reveals iron-sulfur cluster catalyzed sulfane sulfur reduction in ancient life},
author = {Yu, Hongjun and Haja, Dominik K. and Schut, Gerrit J. and Wu, Chang-Hao and Meng, Xing and Zhao, Gongpu and Li, Huilin and Adams, Michael W. W.},
abstractNote = {Abstract Modern day aerobic respiration in mitochondria involving complex I converts redox energy into chemical energy and likely evolved from a simple anaerobic system now represented by hydrogen gas-evolving hydrogenase (MBH) where protons are the terminal electron acceptor. Here we present the cryo-EM structure of an early ancestor in the evolution of complex I, the elemental sulfur (S 0 )-reducing reductase MBS. Three highly conserved protein loops linking cytoplasmic and membrane domains enable scalable energy conversion in all three complexes. MBS contains two proton pumps compared to one in MBH and likely conserves twice the energy. The structure also reveals evolutionary adaptations of MBH that enabled S 0 reduction by MBS catalyzed by a site-differentiated iron-sulfur cluster without participation of protons or amino acid residues. This is the simplest mechanism proposed for reduction of inorganic or organic disulfides. It is of fundamental significance in the iron and sulfur-rich volcanic environments of early earth and possibly the origin of life. MBS provides a new perspective on the evolution of modern-day respiratory complexes and of catalysis by biological iron-sulfur clusters.},
doi = {10.1038/s41467-020-19697-7},
journal = {Nature Communications},
number = 1,
volume = 11,
place = {United Kingdom},
year = {Mon Nov 23 00:00:00 EST 2020},
month = {Mon Nov 23 00:00:00 EST 2020}
}
https://doi.org/10.1038/s41467-020-19697-7
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