1fr3

THE HIGH RESOLUTION STRUCTURE OF A MOLYBDATE BINDING PROTEIN FROM SPOROMUSA OVATA

spinqualitylabelsall models 1fr3, resolution 1.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1fr3 is a 12 chain structure with sequence from Sporomusa ovata. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.5Å Ligands: WO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q7SIF7_9FIRM 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 PubMed BACKGROUND: Transport of molybdenum into bacteria involves a high-affinity ABC transporter system whose expression is controlled by a repressor protein called ModE. While molybdate transport is tightly coupled to utilization in some bacteria, other organisms have molybdenum storage proteins. One class of putative molybdate storage proteins is characterized by a sequence consisting of about 70 amino acids (Mop). A tandem repeat of Mop sequences also constitutes the molybdate binding domain of ModE. RESULTS: We have determined the crystal structure of the 7 kDa Mop protein from the methanol-utilizing anaerobic eubacterium Sporomusa ovata grown in the presence of molybdate and tungstate. The protein occurs as highly symmetric hexamers binding eight oxyanions. Each peptide assumes a so-called OB fold, which has previously also been observed in ModE. There are two types of oxyanion binding sites in Mo at the interface between two or three peptides. All oxyanion binding sites were found to be occupied by WO(4) rather than MoO(4). CONCLUSIONS: The biological function of proteins containing only Mop sequences is unknown, but they have been implicated in molybdate homeostasis and molybdopterin cofactor biosynthesis. While there are few indications that the S. ovata Mop binds pterin, the structure suggests that only the type-1 oxyanion binding sites would be sufficiently accessible to bind a cofactor. The observed occupation of the oxyanion binding sites by WO(4) indicates that Mop might also be involved in controlling intracellular tungstate levels. Structure of the molybdate/tungstate binding protein mop from Sporomusa ovata.,Wagner UG, Stupperich E, Kratky C Structure. 2000 Nov 15;8(11):1127-36. PMID:11080635 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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