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PERIPLASMIC ZINC BINDING PROTEIN TROA FROM TREPONEMA PALLIDUMPERIPLASMIC ZINC BINDING PROTEIN TROA FROM TREPONEMA PALLIDUM
Structural highlights
FunctionTROA_TREPA Part of an ATP-driven transport system TroABCD for zinc. Substrate-binding protein involved in the transport of zinc across the cytoplasmic membrane. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe crystal structure of recombinant TroA, a zinc-binding protein component of an ATP-binding cassette transport system in Treponema pallidum, was determined at a resolution of 1.8 A. The organization of the protein is largely similar to other periplasmic ligand-binding proteins (PLBP), in that two independent globular domains interact with each other to create a zinc-binding cleft between them. The structure has one bound zinc pentavalently coordinated to residues from both domains. Unlike previous PLBP structures that have an interdomain hinge composed of beta-strands, the N- and C-domains of TroA are linked by a single long backbone helix. This unique backbone helical conformation was possibly adopted to limit the hinge motion associated with ligand exchange. Treponema pallidum TroA is a periplasmic zinc-binding protein with a helical backbone.,Lee YH, Deka RK, Norgard MV, Radolf JD, Hasemann CA Nat Struct Biol. 1999 Jul;6(7):628-33. PMID:10404217[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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