Talk:Carbamoyl phosphate synthetase I

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CPS I does not transfer ammonia from glutamine. This is done by CPS II. The ammonia source for CPS I is glutamat. Its an enzyme with a channel for free ammonia. Ammonia never leaves the enzym.

"CPSI is allosterically regulated by purine and pyrimidine nucleotides where the former is allosterically activates the enzyme and the later allosterically inhibits CPSI." <--Is this true? I thought this was for CPSII? N- Acetylglutamate is the most important allosteric regulator of CPSI ( —Preceding unsigned comment added by (talk) 17:37, 7 February 2011 (UTC)