The rate-limiting step for norepinephrine synthesis
High-Yield Explanation
In the synthesis of Norepinephrine, Tyrosine is hydroxylated to 3,4dihydroxyphenylalanine by tyrosine hydroxylase. This enzyme catalyses the rate limiting reaction and require tetrahydrobiopterin as coenzyme.Ref: Biochemistry, U. Satyanarayana, Fouh edition, page no: 349