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. Author manuscript; available in PMC: 2010 Nov 29.
Published in final edited form as: Structure. 2009 Jul 15;17(7):965–973. doi: 10.1016/j.str.2009.05.008

Figure 6. PAL reaction mechanism.

Figure 6

A mechanism for PAL is proposed on the basis of structural and biochemical data. After substrate binding to the active site through coordination of the substrate a-hydoxyl group to the Zn(II) ion, the Tyr654 (as phenolate) deprotonates the substrate α-OH, triggering Cα-N bond cleavage and formation of the amidated peptide and glyoxylate.