tyrosine metabolic pathway hydrophobic amino acid degradation pathway tyrosine degradation pathway 2013-05-13T12:01:22Z PW:0001284 Those metabolic reactions involved in the degradation and/or conversion of tyrosine, a non-essential amino acid. Tyrosine is the precursor of several neurotransmitters and hormones. Tyrosine can also be degraded to acetoacetate and fumarate. In plants, tyrosine is the precursor of several families of secondary metabolites. Tyrosine catabolism pathway tyrosine catabolic process vpetri