Oxidation—Reduction and Enzymes and Proteins
Table 3-1 summarizes some of the important biological oxidation—reduction reactions and the elements associated with them. In the present chapter we are concerned with both the electron-carrier proteins and the enzymes in which inorganic elements function as electron mediators (i.e., the first two groups in Table 3-1), and the oxidation—reduction reactions involving sulfur and selenium. Proteins/enzymes involved in dealing with dioxygen and its derivatives will be discussed in the next chapter. Our main interest lies in the question: why would a specific element have been selected for a specific biological function? There are two important types of parameters to consider: thermodynamic and kinetic. These are illustrated in Fig. 3-1. The kinetic parameter expresses how fast the reaction proceeds and is dependent on the activation energy ΔH* or ΔG*. This will be considered later.
KeywordsReduction Potential Lipoic Acid Flavin Adenine Dinucleotide Formate Dehydrogenase Aldehyde Oxidase
Unable to display preview. Download preview PDF.