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• W2295543337 abstract "The biosynthesis of NAD constitutes an important metabolic module in the cell, since NAD is an essential cofactor involved in several metabolic reactions. NAD concentrations are known to be significantly increased in several cancers, particularly in glioma, consistent with the observation of up-regulation of several enzymes of the network. Modulating NAD biosynthesis in glioma is therefore an attractive therapeutic strategy. Here we report reconstruction of a biochemical network of NAD biosynthesis consisting of 22 proteins, 36 metabolites, and 86 parameters, tuned to mimic the conditions in glioma. Kinetic simulations of the network provide comprehensive insights about the role of individual enzymes. Further, quantitative changes in the same network between different states of health and disease enable identification of drug targets, based on specific alterations in the given disease. Through simulations of enzyme inhibition titrations, we identify NMPRTase as a potential drug target, while eliminating other possible candidates NMNAT, NAPRTase, and NRK. We have also simulated titrations of both binding affinities as well as inhibitor concentrations, which provide insights into the druggability limits of the target, a novel aspect that can provide useful guidelines for designing inhibitors with optimal affinities. Our simulations suggest that an inhibitor affinity of 10 nM used in a concentration range of 0.1 to 10 μM achieves a near maximal inhibition response for NMPRTase and that increasing the affinity any further is not likely to have a significant advantage. Thus, the quantitative appreciation defines a maximal extent of inhibition possible for a chosen enzyme in the context of its network. Knowledge of this type enables an upper affinity threshold to be defined as a goal in lead screening and refinement stages in drug discovery." @default.
• W2295543337 created "2016-06-24" @default.
• W2295543337 creator A5040848332 @default.
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• W2295543337 date "2016-04-18" @default.
• W2295543337 modified "2023-10-16" @default.
• W2295543337 title "Probing the Druggability Limits for Enzymes of the NAD Biosynthetic Network in Glioma" @default.
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• W2295543337 doi "https://doi.org/10.1021/acs.jcim.5b00733" @default.
• W2295543337 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26958865" @default.
• W2295543337 hasPublicationYear "2016" @default.
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