3k6x
M. acetivorans Molybdate-Binding Protein (ModA) in Molybdate-Bound Close Form with 2 Molecules in Asymmetric Unit Forming Beta BarrelM. acetivorans Molybdate-Binding Protein (ModA) in Molybdate-Bound Close Form with 2 Molecules in Asymmetric Unit Forming Beta Barrel
Structural highlights
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 trace-element oxyanion molybdate, which is required for the growth of many bacterial and archaeal species, is transported into the cell by an ATP-binding cassette (ABC) transporter superfamily uptake system called ModABC. ModABC consists of the ModA periplasmic solute-binding protein, the integral membrane-transport protein ModB and the ATP-binding and hydrolysis cassette protein ModC. In this study, X-ray crystal structures of ModA from the archaeon Methanosarcina acetivorans (MaModA) have been determined in the apoprotein conformation at 1.95 and 1.69 A resolution and in the molybdate-bound conformation at 2.25 and 2.45 A resolution. The overall domain structure of MaModA is similar to other ModA proteins in that it has a bilobal structure in which two mixed alpha/beta domains are linked by a hinge region. The apo MaModA is the first unliganded archaeal ModA structure to be determined: it exhibits a deep cleft between the two domains and confirms that upon binding ligand one domain is rotated towards the other by a hinge-bending motion, which is consistent with the 'Venus flytrap' model seen for bacterial-type periplasmic binding proteins. In contrast to the bacterial ModA structures, which have tetrahedral coordination of their metal substrates, molybdate-bound MaModA employs octahedral coordination of its substrate like other archaeal ModA proteins. Apo and ligand-bound structures of ModA from the archaeon Methanosarcina acetivorans.,Chan S, Giuroiu I, Chernishof I, Sawaya MR, Chiang J, Gunsalus RP, Arbing MA, Perry LJ Acta Crystallogr Sect F Struct Biol Cryst Commun. 2010 Mar 1;66(Pt, 3):242-50. Epub 2010 Feb 23. PMID:20208152[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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