Incubations of (4R)- and (4S)-[4-2H1]-proclavaminic acid with clavaminic acid synthase resulted in the stereospecific removal of the deuterium and hydrogen respectively from C-4, in their conversions to clavaminic acid, suggesting an enzyme catalysed syn-eliminaion for the desaturation of dihydroclavaminic acid to clavaminic acid.
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Baldwin et al. (1994) studied this question.
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