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Tyrosine hydroxylase is the rate-limiting enzyme of catecholamine biosynthesis; it uses tetrahydrobiopterin and molecular oxygen to convert tyrosine to DOPA. Its amino terminal 150 amino acids comprise a domain whose structure is involved in regulating the enzyme’s activity. Modes of regulation include phosphorylation by multiple kinases at four different serine residues, and dephosphorylation by...
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