Kelland JG, Palcic MM, Pickard MA, Vederas JC. Stereochemistry of lysine formation by meso-diaminopimelate decarboxylase from wheat germ: use of 1H-13C NMR shift correlation to detect stereospecific deuterium labeling.
Biochemistry 1985;
24:3263-7. [PMID:
3927976 DOI:
10.1021/bi00334a028]
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Abstract
The stereochemical course of the wheat germ meso-diaminopimelate (DAP) decarboxylase reaction is compared to that of the decarboxylase isolated from Bacillus sphaericus, which has been reported to proceed with an unusual inversion of configuration [Asada, Y., Tanizawa, K., Sawada, S., Suzuki, T., Misono, H., & Soda, K. (1981) Biochemistry 20, 6881-6886]. Reaction of each enzyme with either unlabeled diaminopimelic acid in D2O or [2,6-2H2]diaminopimelic acid in H2O gave stereospecifically deuterium-labeled lysine samples that were derivatized with (-)-camphanoyl chloride and diazomethane. Analysis by two-dimensional 1H-13C heteronuclear NMR shift correlation spectroscopy with 2H decoupling confirmed the stereochemistry of the B. sphaericus enzyme reaction and showed that the eukaryotic wheat germ meso-DAP decarboxylase also operates with inversion of configuration. This suggests similar mechanisms for the prokaryotic and eukaryotic enzymes and contrasts the retention mode observed with other pyridoxal phosphate dependent alpha-decarboxylases.
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