5iao

Structure and mapping of spontaneous mutational sites of PyrR from Mycobacterium tuberculosis

spinqualitylabelsall models 5iao, resolution 2.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5iao is a 6 chain structure with sequence from Mycobacterium tuberculosis H37Ra. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.598Å Ligands: URF Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PYRR_MYCTU Regulates the transcription of the pyrimidine nucleotide (pyr) operon in response to exogenous pyrimidines (By similarity). Also displays a weak uracil phosphoribosyltransferase activity which is not physiologically significant (By similarity). Publication Abstract from PubMed The emergence of resistant Mycobacterium tuberculosis (Mtb) infection and the dearth of drugs against tuberculosis have made it imperative to identify and validate novel targets and classes of drugs for treatment. The pyrimidine operon regulatory protein (PyrR), a regulator of de novo pyrimidine synthesis, is an essential enzyme and a probable 5-fluorouracil (5-FU) target in Mtb, with mutations in PyrR attributable to 5-FU resistance. Here we report, for the first time, the co-crystal structure of the PyrR-5-FU complex along with mapping of spontaneous mutational sites of PyrR. A cluster of mutations in the presence of the drug usually indicates a plausible region of drug-target interaction. Notably, we observed that three of the mutated PyrR residues lie in close proximity to the 5-FU binding site, including the amino acid Val178, which is involved in water mediated hydrogen bonding contact with 5-FU. Computational modeling of the PyrR-5'-phosphoribosyl-alpha-1'-pyrophosphate (PRPP) complex revealed the location of several other mutations at the PRPP binding site of PyrR, indicating their probable role in resistance. Indeed, 5-FU-resistant strains harboring these mutations exhibited decreased susceptibility to 5-FU. Considering that pyrimidine analogs are predominantly regarded to inhibit PyrR, the present studies will be beneficial for the screening of appropriate inhibitors of PyrR and help provide insight into future TB drug design and development. Structure and mapping of spontaneous mutational sites of PyrR from Mycobacterium tuberculosis.,Ghode P, Ramachandran S, Bifani P, Sivaraman J Biochem Biophys Res Commun. 2016 Mar 18;471(4):409-15. doi:, 10.1016/j.bbrc.2016.02.071. Epub 2016 Feb 18. PMID:26902118 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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