1usl

Structure Of Mycobacterium tuberculosis Ribose-5-Phosphate Isomerase, RpiB, Rv2465c, Complexed With Phosphate.

spinqualitylabelsall models 1usl, resolution 1.88Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1usl is a 5 chain structure with sequence from Mycobacterium tuberculosis H37Rv. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.88Å Ligands: PO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function RPIB_MYCTU Has isomerase activity towards D-ribose 5-phosphate, but not towards D-allose 6-phosphate. 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 Ribose-5-phosphate isomerases (EC 5.3.1.6) inter-convert ribose-5-phosphate and ribulose-5-phosphate. This reaction allows the synthesis of ribose from other sugars, as well a means for salvage of carbohydrates after nucleotide breakdown. Two unrelated types of enzyme are known to catalyze the isomerization. The most common one, RpiA, is present in almost all organisms. The second type, RpiB, is found in many bacterial species.Here, we demonstrate that the RpiB from Mycobacterium tuberculosis (Rv2465c) has catalytic properties very similar to those previously reported for the Escherichia coli RpiB enzyme. Further, we report the structure of the mycobacterial enzyme, solved by molecular replacement and refined to 1.88A resolution. Comparison with the E.coli structure shows that there are important differences in the two active sites, including a change in the position and nature of the catalytic base. Sequence comparisons reveal that the M.tuberculosis and E.coli RpiB enzymes are in fact representative of two distinct sub-families. The mycobacterial enzyme represents a type found only in actinobacteria, while the enzyme from E.coli is typical of that seen in many other bacterial proteomes. Both RpiBs are very different from RpiA in structure as well as in the construction of the active site. Docking studies allow additional insights into the reactions of all three enzymes, and show that many features of the mechanism are preserved despite the different catalytic components. Mycobacterium tuberculosis ribose-5-phosphate isomerase has a known fold, but a novel active site.,Roos AK, Andersson CE, Bergfors T, Jacobsson M, Karlen A, Unge T, Jones TA, Mowbray SL J Mol Biol. 2004 Jan 16;335(3):799-809. PMID:14687575 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ribose-5-phosphate isomerase 3D structures

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