Structural highlights
Function[H0Q6L9_ECOLI] Acts on guanine, xanthine and to a lesser extent hypoxanthine.[HAMAP-Rule:MF_01903][SAAS:SAAS00010659] Publication Abstract from PubMedEscherichia coli (Ec) cells possess two purine salvage enzymes: xanthine-guanine phosphoribosyltransferase (XGPRT) and hypoxanthine phosphoribosyltransferase (HPRT). EcXGPRT shares a common structural feature with other members of this family, a flexible loop that closes over the active site during catalysis. The replacement of six of these amino acids by alanine has no effect on the Km for the two substrates. However, the Ki for the nucleoside monophosphate increases by 27-fold, and the kcat is reduced by approximately 200-fold. Nucleoside phosphonates (NP) are good inhibitors of EcXGPRT and EcHPRT, with Ki values as low as 10 nM. In the absence of the flexible loop, these values increase by 5- to 30-fold, indicating the importance of the loop for high-affinity inhibition. Crystal structures of two NPs in complex with EcXGPRT explain the tight binding. Prodrugs of NPs with low Ki values for EcXGPRT or EcHPRT exhibit IC50 values between 5 and 23 muM against Mycobacterium tuberculosis in cell-based assays, suggesting that these compounds are therapeutic leads against pathogenic bacteria. Inhibition of the Escherichia coli 6-oxopurine phosphoribosyltransferases by nucleoside phosphonates: potential for new antibacterial agents.,Keough DT, Hockova D, Rejman D, Spacek P, Vrbkova S, Krecmerova M, Eng WS, Jans H, West NP, Naesens LM, de Jersey J, Guddat LW J Med Chem. 2013 Sep 12;56(17):6967-84. doi: 10.1021/jm400779n. Epub 2013 Aug 27. PMID:23927482[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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