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Nevertheless, if we consider the two sets of reactions, A and B, below, we
see that either of them is faster than that written above. Both introduce
CoA, which acts as the catalyst.
We see that at the end of the reaction, the catalyst remains intact and
ready to function again.Besides DPN, a number of other coenzymes of the oxido-reduction type
act by reason of their ability to be alternatively oxidized and reduced.
These are the coenzymes of hydrogen transport: TPN, FMN, FAD and
thioctic acid, whose structure we have already considered.The few examples above give some idea of the variety of mechanisms
of coenzyme action, an action which operates in conjunction with the
activation by the enzyme macromolecule itself. The mechanism of this
activation is one of the most important problems facing modern bio-
chemistry.
REFERENCES
LAIDLER K. J. ( 1954). Introduction to the Chemistry of Enzymes, McGraw Hill
New York.
HOFFMANN-OSTENHOF O. ( 1954). Enzymologie, Springer, Wien.
MEHLER A. H. ( 1957). Introduction to Enzymology, Academic Press, New York.
DIXON M. and WEBB E. C. ( 1958). Enzymes, Longmans, Green and Co, London.

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Publication Information: Book Title: Unity and Diversity in Biochemistry: An Introduction to Chemical Biology. Contributors: Marcel Florkin - author, T. Wood - transltr. Publisher: Pergamon Press. Place of Publication: Oxford. Publication Year: 1960. Page Number: 176.
    
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