Abstract
The spectra of the circular polarization of luminescence of a number of dehydrogenases with the fluorescent coenzyme nicotinamide-1,- N 6-ethenoadenine dinucleotide were measured. By use of this technique it is demonstrated that there is a difference in structure between the adenine subsite in rabbit muscle glyceraldehyde-3-phosphate dehydrogenase on the one hand and pig heart lactate dehydrogenase, horse liver alcohol dehydrogenase, beef liver glutamate dehydrogenase, and pig heart malate dehydrogenase on the other hand. It is concluded that the non-co-operative dehydrogenases have similar, if not identical, adenine subsites whereas in glyceraldehyde-3-phosphate dehydrogenase, a strongly co-operative enzyme, a different structure of the adenine subsite has evolved.
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