4aq4

substrate bound sn-glycerol-3-phosphate binding periplasmic protein ugpB from Escherichia coli

spinqualitylabelsall models 4aq4, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4aq4 is a 1 chain structure with sequence from Escherichia coli K-12. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.8Å Ligands: CD, CO, G3P, GOL, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function UGPB_ECOLI sn-glycerol-3-phosphate and glycerophosphoryl diester-binding protein interacts with the binding protein-dependent transport system UgpACE. Publication Abstract from PubMed Under phosphate starvation conditions, Escherichia coli can utilize sn-glycerol-3-phosphate (G3P) and G3P diesters as phosphate source when transported by an ATP binding cassette importer composed of the periplasmic binding protein, UgpB, the transmembrane subunits, UgpA and UgpE, and a homodimer of the nucleotide binding subunit, UgpC. The current knowledge on the Ugp transporter is solely based on genetic evidence and transport assays using intact cells. Thus, we set out to characterize its properties at the level of purified protein components. UgpB was demonstrated to bind G3P and glycerophosphocholine with dissociation constants of 0.68 +/- 0.02 muM and 5.1 +/- 0.3 muM, respectively, while glycerol-2-phosphate (G2P) is not a substrate. The crystal structure of UgpB in complex with G3P was solved at 1.8 A resolution and revealed the interaction with two tryptophan residues as key to the preferential binding of linear G3P in contrast to the branched G2P. Mutational analysis validated the crucial role of Trp-169 for G3P binding. The purified UgpAEC(2) complex displayed UgpB/G3P-stimulated ATPase activity in proteoliposomes that was neither inhibited by phosphate nor by the signal transducing protein PhoU or the phosphodiesterase UgpQ. Furthermore, a hybrid transporter composed of MalFG-UgpC could be functionally reconstituted while a UgpAE-MalK complex was unstable. Determinants of substrate specificity and biochemical properties of the sn-glycerol-3-phosphate ATP binding cassette transporter (UgpB-AEC(2) ) of Escherichia coli.,Wuttge S, Bommer M, Jager F, Martins BM, Jacob S, Licht A, Scheffel F, Dobbek H, Schneider E Mol Microbiol. 2012 Sep 27. doi: 10.1111/mmi.12025. PMID:23013274 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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