3eul

Structure of the signal receiver domain of the putative response regulator NarL from Mycobacterium tuberculosis

spinqualitylabelsall models 3eul, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3eul is a 4 chain structure with sequence from Mycobacterium tuberculosis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.9Å Ligands: CL Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function NARL_MYCTU Probable member of the two-component regulatory system NarS/NarL. 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 NarL from Mycobacterium tuberculosis is a putative nitrate response regulator that is involved in the regulation of anaerobic metabolism in this pathogen. The recombinant purified N-terminal signal receiver domain of NarL has been crystallized in space group C222(1), with unit-cell parameters a = 85.6, b = 90.0, c = 126.3 A, and the structure was determined by molecular replacement to 1.9 A resolution. Comparisons with related signal receiver domains show that the closest structural homologue is an uncharacterized protein from Staphylococcus aureus, whereas the nearest sequence homologue, NarL from Escherichia coli, displays larger differences in three-dimensional structure. The largest differences between the mycobacterial and E. coli NarL domains were found in the loop between beta3 and alpha3 in the proximity of the phosphorylation site. The active site in response regulators is similar to that of members of the haloacid dehalogenase (HAD) family, which also form a phospho-aspartyl intermediate. In NarL, the aspartic acid that acts as catalytic acid/base in several HAD enzymes is replaced by an arginine residue, which is less likely to participate in steps involving proton abstraction. This substitution may slow down the breakdown of the phospho-aspartyl anhydride and allow signalling beyond the timescales defined by a catalytic reaction intermediate. 1.9 A structure of the signal receiver domain of the putative response regulator NarL from Mycobacterium tuberculosis.,Schnell R, Agren D, Schneider G Acta Crystallogr Sect F Struct Biol Cryst Commun. 2008 Dec 1;64(Pt, 12):1096-100. Epub 2008 Nov 28. PMID:19052358 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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