3psa | pdb_00003psa

Classification of a Haemophilus influenzae ABC transporter HI1470/71 through its cognate molybdate periplasmic binding protein MolA (MolA bound to tungstate)

spinqualitylabelsall models 3psa, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3psa is a 1 chain structure with sequence from Haemophilus influenzae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.7Å Ligands: WO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function MOLA_HAEIN Part of the ABC transporter complex MolBCA involved in molybdate import (PubMed:22078568, PubMed:24722984). Functions as a low-affinity molybdate transporter (PubMed:24722984). Binds to both molybdate and tungstate, but not to sulfate or phosphate (PubMed:22078568). Publication Abstract from PubMed molA (HI1472) from H. influenzae encodes a periplasmic binding protein (PBP) that delivers substrate to the ABC transporter MolB(2)C(2) (formerly HI1470/71). The structures of MolA with molybdate and tungstate in the binding pocket were solved to 1.6 and 1.7 A resolution, respectively. The MolA-binding protein binds molybdate and tungstate, but not other oxyanions such as sulfate and phosphate, making it the first class III molybdate-binding protein structurally solved. The approximately 100 muM binding affinity for tungstate and molybdate is significantly lower than observed for the class II ModA molybdate-binding proteins that have nanomolar to low micromolar affinity for molybdate. The presence of two molybdate loci in H. influenzae suggests multiple transport systems for one substrate, with molABC constituting a low-affinity molybdate locus. Classification of a Haemophilus influenzae ABC Transporter HI1470/71 through Its Cognate Molybdate Periplasmic Binding Protein, MolA.,Tirado-Lee L, Lee A, Rees DC, Pinkett HW Structure. 2011 Nov 9;19(11):1701-10. PMID:22078568 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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