By Wulf O.R.
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Additional info for A Progression Relation in the Molecular Spectrum of Oxygen Occurring in the Liquid and in the Gas at High Pressure
A large part of the surface of the molecule is structured and conserved through evolution, presumably because cytochrome c has a large area of contact with its reductase on the one side, and its oxidase on the other 61). It has also been demonstrated, with purified sitespecific antibodies, that there are separate oxidase and reductase reaction sites on the surface of cytochrome c involved in its interaction with the oxidase and reductase segments of the respiratory chain 63). The stereospecificity of an enzyme-catalyzed reaction may provide helpful clues to possible genetic relationships of different enzymes, because the stereospecificity would be expected to be conserved to a large extent during the evolutionary changes of the protein.
Coli epimerases have been purified and extensively investigated. They both contain one mole of tightly bound NAD per mole of enzyme. It was originally proposed by Maxwell 44) that the enzyme functions by transferring H from C - 4 of the carbohydrate to NAD, and then back from the NADH to the carbonyl group at C - 4 of the carbohydrate. This type of mechanism has been well substantiated 4s), and it has been shown that the H transfer is stereospecific for the 4 pro S or 4 B position of the nicotinamide ring of the NADH.
55 B. Vennesland to an alcohol, and the latter enzyme with B stereospecificity 9o) for the pyridine nucleotide catalyzes the oxidation of an alcohol to an acid. In both cases, the two consecutive steps of the reaction have the same stereospecificity for the pyridine nucleotide. Biellman et al. 91) have reported that octopine dehydrogenase transfers hydrogen from the B side of the nicotinamide ring of NADH, or of the 3-cyano analogue of NADH. This enzyme catalyzes the oxidation of D octopine to L arginine and pyruvate, as shown in Scheme 2.
A Progression Relation in the Molecular Spectrum of Oxygen Occurring in the Liquid and in the Gas at High Pressure by Wulf O.R.