1USL
Structure Of Mycobacterium tuberculosis Ribose-5-Phosphate Isomerase, RpiB, Rv2465c, Complexed With Phosphate.
Summary for 1USL
| Entry DOI | 10.2210/pdb1usl/pdb |
| Descriptor | RIBOSE 5-PHOSPHATE ISOMERASE B, PHOSPHATE ION (3 entities in total) |
| Functional Keywords | isomerase, phosphopentose isomerase b, pentose phosphate pathway, rv2465c, phosphoriboisomerase b, structural proteomics in europe, spine, structural genomics |
| Biological source | MYCOBACTERIUM TUBERCULOSIS |
| Total number of polymer chains | 5 |
| Total formula weight | 92128.21 |
| Authors | Roos, A.K.,Andersson, C.E.,Unge, T.,Jones, T.A.,Mowbray, S.L. (deposition date: 2003-11-25, release date: 2004-01-02, Last modification date: 2023-12-13) |
| Primary citation | Roos, A.K.,Andersson, C.E.,Bergfors, T.,Jacobsson, M.,Karlen, A.,Unge, T.,Jones, T.A.,Mowbray, S.L. Mycobacterium Tuberculosis Ribose-5-Phosphate Isomerase Has a Known Fold, But a Novel Active Site J.Mol.Biol., 335:799-, 2004 Cited by PubMed Abstract: 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. PubMed: 14687575DOI: 10.1016/J.JMB.2003.11.021 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.88 Å) |
Structure validation
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