3bp3

Crystal structure of EIIB

spinqualitylabelsall models 3bp3, resolution 1.65Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3bp3 is a 2 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SO4 NonStd Res: MSE Gene: ptsG, glcA, umg (Escherichia coli) Activity: Protein-N(pi)-phosphohistidine--sugar phosphotransferase, with EC number 2.7.1.69 Resources: FirstGlance, OCA, RCSB, PDBsum Function [PTGCB_ECOLI] The phosphoenolpyruvate-dependent sugar phosphotransferase system (sugar PTS), a major carbohydrate active -transport system, catalyzes the phosphorylation of incoming sugar substrates concomitantly with their translocation across the cell membrane. This system is involved in glucose transport. This enzyme is also a chemoreceptor monitoring the environment for changes in sugar concentration. 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 In Escherichia coli, glucose-dependent transcriptional induction of genes encoding a variety of sugar-metabolizing enzymes and transport systems is mediated by the phosphorylation state-dependent interaction of membrane-bound enzyme IICB(Glc) (EIICB(Glc)) with the global repressor Mlc. Here we report the crystal structure of a tetrameric Mlc in a complex with four molecules of enzyme IIB(Glc) (EIIB), the cytoplasmic domain of EIICB(Glc). Each monomer of Mlc has one bound EIIB molecule, indicating the 1:1 stoichiometry. The detailed view of the interface, along with the high-resolution structure of EIIB containing a sulfate ion at the phosphorylation site, suggests that the phosphorylation-induced steric hindrance and disturbance of polar intermolecular interactions impede complex formation. Furthermore, we reveal that Mlc possesses a built-in flexibility for the structural adaptation to its target DNA and that interaction of Mlc with EIIB fused only to dimeric proteins resulted in the loss of its DNA binding ability, suggesting that flexibility of the Mlc structure is indispensable for its DNA binding. Analyses of Mlc-IIBGlc interaction and a plausible molecular mechanism of Mlc inactivation by membrane sequestration.,Nam TW, Jung HI, An YJ, Park YH, Lee SH, Seok YJ, Cha SS Proc Natl Acad Sci U S A. 2008 Mar 11;105(10):3751-6. Epub 2008 Mar 4. PMID:18319344 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Phosphotransferase

Proteopedia Page Contributors and Editors (what is this?)

OCA