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• W2238521485 abstract "Human Guanine Monophosphate Synthetase (hGMPS) converts XMP to GMP, and acts as a bifunctional enzyme with N-terminal glutaminase (GAT) and C-terminal synthetase domain. The enzyme is identified as a potential target for anti-cancer and immunosuppressive therapies. GAT domain of enzyme plays central role in metabolism, and contains conserved catalytic residues Cys104, His190, and Glu192. MD simulation studies on GAT domain suggest that position of oxyanion in unliganded conformation is occupied by one conserved water molecule (W1), which also stabilizes that pocket. This position is occupied by a negatively charged atom of the substrate or ligand in ligand bound crystal structures. In fact, MD simulation study of Ser75 to Val indicates that W1 conserved water molecule is stabilized by Ser75, while Thr152, and His190 also act as anchor residues to maintain appropriate architecture of oxyanion pocket through water mediated H-bond interactions. Possibly, four conserved water molecules stabilize oxyanion hole in unliganded state, but they vacate these positions when the enzyme (hGMPS)-substrate complex is formed. Thus this study not only reveals functionally important role of conserved water molecules in GAT domain, but also highlights essential role of other non-catalytic residues such as Ser75 and Thr152 in this enzymatic domain. The results from this computational study could be of interest to experimental community and provide a testable hypothesis for experimental validation. Conserved sites of water molecules near and at oxyanion hole highlight structural importance of water molecules and suggest a rethink of the conventional definition of chemical geometry of inhibitor binding site." @default.
• W2238521485 created "2016-06-24" @default.
• W2238521485 creator A5013819419 @default.
• W2238521485 creator A5088156810 @default.
• W2238521485 date "2016-01-28" @default.
• W2238521485 modified "2023-09-24" @default.
• W2238521485 title "New insight into the architecture of oxy-anion pocket in unliganded conformation of GAT domains: A MD-simulation study" @default.
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• W2238521485 doi "https://doi.org/10.1002/prot.24983" @default.
• W2238521485 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26756917" @default.
• W2238521485 hasPublicationYear "2016" @default.
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