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. 2004 Dec;16(12):3426–3436. doi: 10.1105/tpc.104.025288

Figure 1.

Figure 1.

Nonoxidative Deamination of Phe.

(A) Reaction catalyzed by PAL from plants and fungi resulting in trans-cinnamate and ammonia. Besides, phenylalanine is processed by other enzymes to Tyr and to phenylpyruvate.

(B) Proposed autocatalytic formation of MIO from the tripeptide 202Ala-Ser-Gly by two water elimination steps. The sp3 conformation at 204-N is taken from the wild-type structure of HAL (Schwede et al., 1999). It is probably enforced by the surrounding polypeptide, increasing the electrophilicity of the 203-Cβ atom.