Isomerization of delta 1-piperideine-2-carboxylate to delta 2-piperideine-2-carboxylate on complexation with flavoprotein D-amino acid oxidase.


The 1,646 cm-1 band in a resonance Raman spectrum obtained with excitation in the charge-transfer band of the complex of oxidized D-amino acid oxidase (DAO) with the oxidation product of D-lysine catalyzed by DAO shifted to 1,617 cm-1 upon 2-13C substitution of lysine. Thus, the band is assigned to a C(2) = C(3) stretching mode of the enamine, delta 2… (More)


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