1xja

Apo form of the Y31V mutant dimerization domain fragment of Escherichia coli regulatory protein AraC

spinqualitylabelsall models 1xja, resolution 2.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1xja is a 5 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.4Å Ligands: EDO Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ARAC_ECOLI This protein controls the expression of at least six genes that are involved in the transport and catabolism of L-arabinose. It regulates initiation of transcription of the araBAD operon and it also controls its own synthesis. The L-arabinose operon displays both positive and negative regulation through AraC. 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 The arabinose-binding pockets of wild type AraC dimerization domains crystallized in the absence of arabinose are occupied with the side chains of Y31 from neighboring domains. This interaction leads to aggregation at high solution concentrations and prevents determination of the structure of truely apo AraC. In this work we found that the aggregation does not significantly occur at physiological concentrations of AraC. We also found that the Y31V mutation eliminates the self-association, but does not affect regulation properties of the protein. At the same time, the mutation allows crystallization of the dimerization domain of the protein with only solvent in the arabinose-binding pocket. Using a distance difference method suitable for detecting and displaying even minor structural variation among large groups of similar structures, we find that there is no significant structural change in the core of monomers of the AraC dimerization domain resulting from arabinose, fucose, or tyrosine occupancy of the ligand-binding pocket. A slight change is observed in the relative orientation of monomers in the dimeric form of the domain upon the binding of arabinose but its significance cannot yet be assessed. Structure and properties of a truely apo form of AraC dimerization domain.,Weldon JE, Rodgers ME, Larkin C, Schleif RF Proteins. 2007 Feb 15;66(3):646-54. PMID:17173282 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Transcriptional activator 3D structures

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