. Biochemistry of plants and animals, an introduction. Biochemistry. CONH2 NHc 0 O O O -H/ II I \H H^^^^-^CHoOPOPOCH., -^-^H I II " _o o. DPNH The reduced form at the right has gained two electrons and one proton by this reaction and is called reduced diphosphopyridine nucleotide or DPNH. Note that the upper left group corresponds to nicotinamide, one of the B vitamins. The purine is adenine, the sugar D-ribose, and the combination with phosphate is adenylic acid (see page 122). [H] represents a suitable source of hydrogen atoms. The above reaction occurs in connection with a number of en
. Biochemistry of plants and animals, an introduction. Biochemistry. CONH2 NHc 0 O O O -H/ II I \H H^^^^-^CHoOPOPOCH., -^-^H I II " _o o. DPNH The reduced form at the right has gained two electrons and one proton by this reaction and is called reduced diphosphopyridine nucleotide or DPNH. Note that the upper left group corresponds to nicotinamide, one of the B vitamins. The purine is adenine, the sugar D-ribose, and the combination with phosphate is adenylic acid (see page 122). [H] represents a suitable source of hydrogen atoms. The above reaction occurs in connection with a number of enzymatic jjrocesses, for example: -OOCGH2CHOHCOO- + DPN+ + H2O <—^ malate -OOCCH2CCOO- + DPNH + H3O+ O oxalacetate The enzyme specific for this reaction is called malic dehydrogenase, and the double-pointed arrow signifies reversibility. The reaction goes in either direction, depending upon the concentrations of the materials present. As is now customary, malate and oxalacetate are written as the ions rather than as the free acids malic and oxalacetic, since these ions are the forms natural to the cells employing this reaction. Another coenzyme, called adenosine triphosphate or ATP, par-. 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 Mallette, M. Frank (Manney Frank), 1917-. New York, Wiley
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