5ahm

IMP-bound form of the DeltaCBS mutant of IMPDH from Pseudomonas aeruginosa

spinqualitylabelsall models 5ahm, resolution 1.74Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5ahm is a 2 chain structure with sequence from Pseudomonas aeruginosa PAO1. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.74Å Ligands: IMP, PO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q9HXM5_PSEAE Catalyzes the conversion of inosine 5'-phosphate (IMP) to xanthosine 5'-phosphate (XMP), the first committed and rate-limiting step in the de novo synthesis of guanine nucleotides, and therefore plays an important role in the regulation of cell growth (By similarity).[HAMAP-Rule:MF_01964] Publication Abstract from PubMed Inosine-5'-monophosphate dehydrogenases (IMPDHs), which are the rate-limiting enzymes in guanosine-nucleotide biosynthesis, are important therapeutic targets. Despite in-depth functional and structural characterizations of various IMPDHs, the role of the Bateman domain containing two CBS motifs remains controversial. Their involvement in the allosteric regulation of Pseudomonas aeruginosa IMPDH by Mg-ATP has recently been reported. To better understand the function of IMPDH and the importance of the CBS motifs, the structure of a variant devoid of these modules (DeltaCBS) was solved at high resolution in the apo form and in complex with IMP. In addition, a single amino-acid substitution variant, D199N, was also structurally characterized: the mutation corresponds to the autosomal dominant mutant D226N of human IMPDH1, which is responsible for the onset of the retinopathy adRP10. These new structures shed light onto the possible mechanism of regulation of the IMPDH enzymatic activity. In particular, three conserved loops seem to be key players in this regulation as they connect the tetramer-tetramer interface with the active site and show significant modification upon substrate binding. Crystallographic studies of two variants of Pseudomonas aeruginosa IMPDH with impaired allosteric regulation.,Labesse G, Alexandre T, Gelin M, Haouz A, Munier-Lehmann H Acta Crystallogr D Biol Crystallogr. 2015 Sep 1;71(Pt 9):1890-9. doi:, 10.1107/S1399004715013115. Epub 2015 Aug 25. PMID:26327379 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Inosine monophosphate dehydrogenase 3D structures

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