The rate-limiting enzyme in the synthesis of dopamine is which of the following?
The first step in the chemical synthesis of dopamine, epinephrine, and norepinephrine is the conversion of L-tyrosine to L-hydroxyphenylalanine, which is catalyzed by tyrosine hydroxylase. This is the rate-limiting step.
Tyrosine hydroxylase
Dopa decarboxylase
Homovanillic acid
Dopamine beta-hydroxylase