Abstract
Macrophages contain arginase and an inducible NO synthase, demonstrated by using l-arginine, the common substrate, for production of both nitric oxide and urea. Arginase was inhibited by nitrite, the stable end product of NO. This inhibition was non-competitive, and could not be explained by the reaction of nitrite with arginine, or by the irreversible covalent modification of arginase, or by the removal of Mn 2+, a cofactor of arginase.
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