. Biophysical science. Biophysics. 18:4/ Enzymes: Kinetics of Oxidations 347 transport against a diffusion gradient, and to make muscular contraction possible. The enzymes of the cytochrome chain consist of three known types. These are the pyridine nucleotides (PN) which contain the coenzyme DPN or TPN, the flavin-adenine-dinucleotides which contain the pros- thetic group FAD, and the cytochromes (cyt), all of which contain a heme group. The structure of a heme group is shown in Figure 1 and that of DPN and FAD in Figure 6. In intact mitochondria, from vertebrates or yeast, these enzymes react
. Biophysical science. Biophysics. 18:4/ Enzymes: Kinetics of Oxidations 347 transport against a diffusion gradient, and to make muscular contraction possible. The enzymes of the cytochrome chain consist of three known types. These are the pyridine nucleotides (PN) which contain the coenzyme DPN or TPN, the flavin-adenine-dinucleotides which contain the pros- thetic group FAD, and the cytochromes (cyt), all of which contain a heme group. The structure of a heme group is shown in Figure 1 and that of DPN and FAD in Figure 6. In intact mitochondria, from vertebrates or yeast, these enzymes react as follows + 2H ATP ATP 1:2 PN+ V-^FADH2\ /cytb"^cytc;' ^PNH + H+/\ FAD ]l\[cytb"J \cytc? + 2H + ADP + P ADP + P ( ATP 'cytc"fr-tfcyta" (cytc'V \cyta" ADP+P 'cyt a5 H20 12"2 (cyta'a/ \02 + 4H + 4: 1 The number of primes after each cytochrome indicates the valence Niacinamide H—N-H N^ N >N' H SH, Adenine ? ? O-P—O—P—o II II H/V+ H2C OH HO CHo H h:~ if_|4 OH OH Ribose. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ackerman, Eugene, 1920-. Englewood Cliffs, N. J. , Prentice-Hall
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