... betweenarginine and agmatine. Agmatine, which results fromdecarboxylation of arginine by arginine decarboxylase,is a metabolic intermediate in the biosynthesis of putrescine and higher polyamines ... by agmatine in E. coli agmatinase and l-arginine in B. caldoveloxarginase [37], indicating that the substrate specificity of these enzymes rely mainly in substituents at C-a.This has been, in ... group of arginine were also operativefor arginase II, both the lack of arginase activity aswell as the resistance of the Asn149Asp mutant toinhibition by l-arginine, would be explained by elec-trostatic...