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L-Arginine serves as a common substrate for both nitric oxide synthase (NOS) and arginase in the cell. NOS catalyzes the oxidation of arginine to citrulline and NO with Nomega-hydroxy-L-arginine (NOHA) formed as an intermediate. Arginase, on the other hand, catalyzes the hydrolysis of arginine into urea and L-ornithine. nor-NOHA (acetate) is a potent, reversible inhibitor of rat liver arginase with a Ki value of 0.5 µM, which is 20-fold lower than the Ki of 10 µM observed for NOHA. It is about 40-fold more potent than NOHA as an inhibitor of arginase from mouse macrophages, exhibiting an IC50 of 10-12 µM. nor-NOHA (acetate) is not a substrate for any of the 3 NOS isoforms and does not inhibit nNOS or iNOS.{13095, 13100}Formal Name: 2S-amino-4-[[(hydroxyamino)iminomethyl]amino]-butanoic acid, diacetate. CAS Number: 1140844-63-8. Synonyms: Nomega-hydroxy-nor-Arginine. Molecular Formula: C5H12N4O3 . 2C2H4O2. Formula Weight: 296.3. Purity: >97%. Formulation: (Request formulation change), A lyophilized powder. Solubility: DMF: 1 mg/ml, DMSO: 5 mg/ml, PBS (pH 7.2): 10 mg/ml. SMILES: N/C(N([H])CC[C@H](N)C(O)=O)=N\O.CC(O)=O.CC(O)=O. InChi Code: InChI=1S/C5H12N4O3.2C2H4O2/c6-3(4(10)11)1-2-8-5(7)9-12,2*1-2(3)4/h3,12H,1-2,6H2,(H,10,11)(H3,7,8,9),2*1H3,(H,3,4). InChi Key: PQFYTZJPYBMTCT-UHFFFAOYSA-N.
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