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Title: The Pyrococcus furiosus ironome is dominated by [Fe4S4]2+ clusters or thioferrate-like iron depending on the availability of elemental sulfur

Abstract

Pyrococcus furiosus is a hyperthermophilic anaerobic archaeon whose metabolism depends on whether elemental sulfur is (+S0) or is not (-S0) included in growth medium. Under +S0 conditions, expression of respiratory hydrogenase declines while respiratory membrane-bound sulfane reductase and the putative iron-storage protein IssA increase. Our objective was to investigate the iron content of WT and ΔIssA cells under these growth conditions using Mössbauer spectroscopy. WT-S0 cells contained 1 mM Fe, with 85% present as two spectroscopically distinct forms of S = 0 [Fe4S4] 2+ clusters; the remainder was mainly high-spin FeII. WT+S0 cells contained 5 to 9 mM Fe, with 75 to 90% present as magnetically ordered thioferrate-like (TFL) iron nanoparticles. TFL iron was similar to chemically defined thioferrates; both consisted of FeIII ions coordinated by an S4 environment, and both exhibited strong coupling between particles causing high applied fields to have little spectral effect. At high temperatures with magnetic hyperfine interactions abolished, TFL iron exhibited two doublets overlapping those of [Fe4S4] 2+ clusters in -S0 cells. This coincidence arose because of similar coordination environments of TFL iron and cluster iron. The TFL structure was more heterogeneous in the presence of IssA. Presented data suggest that IssA may coordinate insolublemore » iron sulfides as TFL iron, formed as a byproduct of anaerobic sulfur respiration under high iron conditions, which thereby reduces its toxicity to the cell. This was the first Mössbauer characterization of the ironome of an archaeon, and it illustrates differences relative to the iron content of better-studied bacteria such as Escherichia coli.« less

Authors:
; ; ORCiD logo; ORCiD logo; ORCiD logo
Publication Date:
Sponsoring Org.:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Institutes of Health (NIH); National Science Foundation (NSF); Robert A. Welch Foundation
OSTI Identifier:
1780149
Alternate Identifier(s):
OSTI ID: 1816700
Grant/Contract Number:  
FG02-95ER20175; GM127021; MCB-1819389; A1170
Resource Type:
Published Article
Journal Name:
Journal of Biological Chemistry
Additional Journal Information:
Journal Name: Journal of Biological Chemistry Journal Volume: 296 Journal Issue: C; Journal ID: ISSN 0021-9258
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 59 BASIC BIOLOGICAL SCIENCES; Mossbauer; electron paramagnetic resonance; magnetically ordered; hyperthermophilic; archaea

Citation Formats

Vali, Shaik Waseem, Haja, Dominik K., Brand, Richard A., Adams, Michael W. W., and Lindahl, Paul A. The Pyrococcus furiosus ironome is dominated by [Fe4S4]2+ clusters or thioferrate-like iron depending on the availability of elemental sulfur. United States: N. p., 2021. Web. doi:10.1016/j.jbc.2021.100710.
Vali, Shaik Waseem, Haja, Dominik K., Brand, Richard A., Adams, Michael W. W., & Lindahl, Paul A. The Pyrococcus furiosus ironome is dominated by [Fe4S4]2+ clusters or thioferrate-like iron depending on the availability of elemental sulfur. United States. https://doi.org/10.1016/j.jbc.2021.100710
Vali, Shaik Waseem, Haja, Dominik K., Brand, Richard A., Adams, Michael W. W., and Lindahl, Paul A. Fri . "The Pyrococcus furiosus ironome is dominated by [Fe4S4]2+ clusters or thioferrate-like iron depending on the availability of elemental sulfur". United States. https://doi.org/10.1016/j.jbc.2021.100710.
@article{osti_1780149,
title = {The Pyrococcus furiosus ironome is dominated by [Fe4S4]2+ clusters or thioferrate-like iron depending on the availability of elemental sulfur},
author = {Vali, Shaik Waseem and Haja, Dominik K. and Brand, Richard A. and Adams, Michael W. W. and Lindahl, Paul A.},
abstractNote = {Pyrococcus furiosus is a hyperthermophilic anaerobic archaeon whose metabolism depends on whether elemental sulfur is (+S0) or is not (-S0) included in growth medium. Under +S0 conditions, expression of respiratory hydrogenase declines while respiratory membrane-bound sulfane reductase and the putative iron-storage protein IssA increase. Our objective was to investigate the iron content of WT and ΔIssA cells under these growth conditions using Mössbauer spectroscopy. WT-S0 cells contained 1 mM Fe, with 85% present as two spectroscopically distinct forms of S = 0 [Fe4S4] 2+ clusters; the remainder was mainly high-spin FeII. WT+S0 cells contained 5 to 9 mM Fe, with 75 to 90% present as magnetically ordered thioferrate-like (TFL) iron nanoparticles. TFL iron was similar to chemically defined thioferrates; both consisted of FeIII ions coordinated by an S4 environment, and both exhibited strong coupling between particles causing high applied fields to have little spectral effect. At high temperatures with magnetic hyperfine interactions abolished, TFL iron exhibited two doublets overlapping those of [Fe4S4] 2+ clusters in -S0 cells. This coincidence arose because of similar coordination environments of TFL iron and cluster iron. The TFL structure was more heterogeneous in the presence of IssA. Presented data suggest that IssA may coordinate insoluble iron sulfides as TFL iron, formed as a byproduct of anaerobic sulfur respiration under high iron conditions, which thereby reduces its toxicity to the cell. This was the first Mössbauer characterization of the ironome of an archaeon, and it illustrates differences relative to the iron content of better-studied bacteria such as Escherichia coli.},
doi = {10.1016/j.jbc.2021.100710},
journal = {Journal of Biological Chemistry},
number = C,
volume = 296,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 2021},
month = {Fri Jan 01 00:00:00 EST 2021}
}

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