6rpu

Structure of the ternary complex of the IMPDH enzyme from Ashbya gossypii bound to the dinucleoside polyphosphate Ap5G and GDP

spinqualitylabelsall models 6rpu, resolution 2.11Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6rpu is a 1 chain structure with sequence from Ashgo. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACT, G5P, GDP Gene: AGOS_AER117W (ASHGO) Activity: IMP dehydrogenase, with EC number 1.1.1.205 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [Q756Z6_ASHGO] 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.[HAMAP-Rule:MF_03156] Publication Abstract from PubMed IMP dehydrogenase (IMPDH) is an essential enzyme that catalyzes the rate-limiting step in the de novo guanine nucleotide biosynthetic pathway. Because of its involvement in the control of cell division and proliferation, IMPDH represents a therapeutic for managing several diseases, including microbial infections and cancer. IMPDH must be tightly regulated, but the molecular mechanisms responsible for its physiological regulation remain unknown. To this end, we recently reported an important role of adenine and guanine mononucleotides that bind to the regulatory Bateman domain to allosterically modulate the catalytic activity of eukaryotic IMPDHs. Here, we have used enzyme kinetics, X-ray crystallography, and small angle Xray scattering (SAXS) methodologies to demonstrate that adenine/guanine dinucleoside polyphosphates bind to the Bateman domain of IMPDH from the fungus Ashbya gossypii with submicromolar affinities. We found that these dinucleoside polyphosphates modulate the catalytic activity of IMPDHs in vitro by efficiently competing with the adenine/guanine mononucleotides for the allosteric sites. These results suggest that dinucleoside polyphosphates play important physiological roles in the allosteric regulation of IMPDHs by adding an additional mechanism for fine-tuning the activities of these enzymes. We propose that these findings may have important implications for the design of therapeutic strategies to inhibit IMPDHs. The Bateman domain of IMP dehydrogenase is a binding target for dinucleoside polyphosphates.,Fernandez-Justel D, Pelaez R, Revuelta JL, Buey RM J Biol Chem. 2019 Aug 15. pii: AC119.010055. doi: 10.1074/jbc.AC119.010055. PMID:31416831 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Inosine monophosphate dehydrogenase 3D structures

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