Structure of a bacterial cell surface decaheme electron conduit

Clarke, Thomas A. ORCID: https://orcid.org/0000-0002-6234-1914, Edwards, Marcus J., Gates, Andrew J. ORCID: https://orcid.org/0000-0002-4594-5038, Hall, Andrea, White, Gaye F., Bradley, Justin, Reardon, Catherine L., Shi, Liang, Beliaev, Alexander S., Marshall, Matthew J., Wang, Zheming, Watmough, Nicholas J., Fredrickson, James K., Zachara, John M., Butt, Julea N. ORCID: https://orcid.org/0000-0002-9624-5226 and Richardson, David J. ORCID: https://orcid.org/0000-0002-6847-1832 (2011) Structure of a bacterial cell surface decaheme electron conduit. Proceedings of the National Academy of Sciences, 108 (23). pp. 9384-9389. ISSN 0027-8424

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Abstract

Some bacterial species are able to utilize extracellular mineral forms of iron and manganese as respiratory electron acceptors. In Shewanella oneidensis this involves decaheme cytochromes that are located on the bacterial cell surface at the termini of trans-outer-membrane electron transfer conduits. The cell surface cytochromes can potentially play multiple roles in mediating electron transfer directly to insoluble electron sinks, catalyzing electron exchange with flavin electron shuttles or participating in extracellular intercytochrome electron exchange along “nanowire” appendages. We present a 3.2-Å crystal structure of one of these decaheme cytochromes, MtrF, that allows the spatial organization of the 10 hemes to be visualized for the first time. The hemes are organized across four domains in a unique crossed conformation, in which a staggered 65-Å octaheme chain transects the length of the protein and is bisected by a planar 45-Å tetraheme chain that connects two extended Greek key split ß-barrel domains. The structure provides molecular insight into how reduction of insoluble substrate (e.g., minerals), soluble substrates (e.g., flavins), and cytochrome redox partners might be possible in tandem at different termini of a trifurcated electron transport chain on the cell surface.

Item Type:	Article
Faculty \ School:	Faculty of Science > School of Biological Sciences Faculty of Science > School of Chemistry
UEA Research Groups:	Faculty of Science > Research Groups > Molecular Microbiology Faculty of Science > Research Groups > Biophysical Chemistry (former - to 2017) Faculty of Science > Research Groups > Organisms and the Environment Faculty of Science > Research Groups > Chemistry of Light and Energy Faculty of Science > Research Groups > Chemistry of Life Processes Faculty of Science > Research Centres > Centre for Molecular and Structural Biochemistry Faculty of Science > Research Groups > Energy Materials Laboratory
Depositing User:	Users 2731 not found.
Date Deposited:	31 Oct 2011 14:36
Last Modified:	01 Aug 2023 23:57
URI:	https://ueaeprints.uea.ac.uk/id/eprint/35319
DOI:	10.1073/pnas.1017200108

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