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• W2037139060 abstract "Recent studies demonstrated that inhibition of dimethylarginine dimethylaminohydrolase (DDAH) activity could be a new strategy to indirectly affect nitric oxide (NO) formation by elevating N(omega)-methylated L-arginine (NMMA, ADMA) levels. This approach is an alternate strategy for the treatment of diseases associated with increased NO-concentrations. To date, three classes of potent inhibitors are known: (1) pentafluorophenyl sulfonates (IC(50)=16-58 microM, PaDDAH), which are also inhibitors for the arginine deiminase; (2) the most potent inhibitors are based on indolylthiobarbituric acid (IC(50)=2-17 microM, PaDDAH), which were identified by virtual modelling; and (3) L-arginine analogs, whose best representative is N(omega)-(2-methoxyethyl)-L-arginine (IC(50)=22 microM, rat DDAH). Based on these known structures, we aimed to develop inhibitors for the human DDAH-1 with improved potency and better relative selectivity for DDAH-1 over NOS. Particularly, the binding pocket of the guanidine-moiety was investigated by screening differently substituted guanidines, amidines and isothioureas in order to collect information on possible binding modes in the active site. All substances were tested in a plate-reader format and HPLC assay and several potent inhibitors were identified with K(i)-values varying from 2 to 36 microM, with N(5)-(1-iminobut-3-enyl)-L-ornithine (L-VNIO) being the most potent inhibitor of the human DDAH-1 so far described. Besides these potent inhibitors alternate substrates for hDDAH-1 were identified as well." @default.
• W2037139060 created "2016-06-24" @default.
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• W2037139060 date "2008-12-15" @default.
• W2037139060 modified "2023-10-11" @default.
• W2037139060 title "Structure–activity relationship of novel and known inhibitors of human dimethylarginine dimethylaminohydrolase-1: Alkenyl-amidines as new leads" @default.
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• W2037139060 doi "https://doi.org/10.1016/j.bmc.2008.10.058" @default.
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