Newton-Vesty, Michael C. and Scalise, Mariafrancesca and Jamieson, Sam A. and Currie, Michael J. and Brown, Hamish G. and Valimehr, Sepideh and Tillett, Zachary D. and Hall, Kelsi R. and Quan, Senwei and Allison, Jane R. and Whitten, Andrew E. and Panjikar, Santosh and Indiveri, Cesare and Hanssen, Eric and Mace, Peter D. and North, Rachel A. and Dobson, Renwick C.J. and Davies, James S. (2026) Structural basis of isethionate transport by a TRAP transporter from a sulfate-reducing bacterium. Structure, 34 (1). pp. 133-144.e5. ISSN 09692126
Full text not available from this repository.Abstract
Sulfate-reducing bacteria import organosulfur compounds from the environment for anaerobic respiration. They contribute to human disease and are problematic in industrial settings because they produce hydrogen sulfide. Here, we demonstrate how the sulfate-reducing bacterium Oleidesulfovibrio alaskensis imports isethionate, a common organosulfonate, using a tripartite ATP-independent periplasmic (TRAP) transporter (OaIsePQM). The cryo-EM structure of isethionate-bound OaIseQM to 2.98 A resolution defines the substrate-binding site, two Na(+)-binding sites, and a distinct fusion helix. Key residues within the OaIseQM substrate-binding site are identified using substitution and proteoliposome assays. Functional studies demonstrate that OaIseQM requires the substrate-binding protein (OaIseP) and a Na(+) gradient to drive transport. Modeling of the OaIsePQM complex supports that elevator-type conformational changes are involved in this unique coupled transport process. This work expands our knowledge of the transport of organosulfur compounds in bacteria and establishes OaIsePQM as a new model system for exploring the mechanism of TRAP transporters.
| Item Type: | Article |
|---|---|
| Subjects: | R Medicine > R Medicine (General) |
| Depositing User: | Repository Administrator |
| Date Deposited: | 04 Sep 2026 05:56 |
| Last Modified: | 04 Sep 2026 05:56 |
| URI: | http://eprints.victorchang.edu.au/id/eprint/1835 |
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