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|2vpz, resolution 2.40Å ()|
|Related:||2vpw, 2vpx, 2vpy|
POLYSULFIDE REDUCTASE NATIVE STRUCTURE
Bacterial polysulfide reductase (PsrABC) is an integral membrane protein complex responsible for quinone-coupled reduction of polysulfide, a process important in extreme environments such as deep-sea vents and hot springs. We determined the structure of polysulfide reductase from Thermus thermophilus at 2.4-A resolution, revealing how the PsrA subunit recognizes and reduces its unique polyanionic substrate. The integral membrane subunit PsrC was characterized using the natural substrate menaquinone-7 and inhibitors, providing a comprehensive representation of a quinone binding site and revealing the presence of a water-filled cavity connecting the quinone binding site on the periplasmic side to the cytoplasm. These results suggest that polysulfide reductase could be a key energy-conserving enzyme of the T. thermophilus respiratory chain, using polysulfide as the terminal electron acceptor and pumping protons across the membrane via a previously unknown mechanism.
Molecular mechanism of energy conservation in polysulfide respiration., Jormakka M, Yokoyama K, Yano T, Tamakoshi M, Akimoto S, Shimamura T, Curmi P, Iwata S, Nat Struct Mol Biol. 2008 Jul;15(7):730-7. Epub 2008 Jun 8. PMID:18536726
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.