By Paul D. Boyer
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Extra info for Carboxylation and Decarboxylation, (Nonoxidative) Isomerization, 3rd Edition
C 8 26 M. C. SCRUTTON AND M. R. Although conditions may exist under which this enzyme exhibits a significant rate of catalysis in the absence of an acyl-CoA, the data presently available are not indicative of such a possibility. It is, therefore, necessary to consider that acyl-CoA's might activate this pyruvate carboxylase as a result of direct participation in the catalytic mechanism. Several observations appear, however, to be inconsistent with such a possibility. ), these enzymes exhibit wide diversity in response to addition of an acyl-CoA (Table 111) (1,5, 20, IOl-104).
Roy. Soc. B176, 1 (1970). f . Require& Requiredd 3 2 Acetyl-CoA Acetyl-CoA No No (1,108) Requiredd Stimulatorye None None 3 1 - Acetyl-CoA Palmityl-CoA - Yes YeS YeS No (1011 (6, 77, 98) (37) (10,23) (5,80,103,104) Obtained from Eq. (6) (105): T I * On the basis of K A , the concentration of acyl-CoA required to achieve 50% maximal activation. Initial rate of CO, fixation is increased more than 1000-fold in the presence of a saturating concentration of acetyl-CoA (102). d Initial rate of COzfixation is increased approximately 50-fold in the presence of a saturating concentration of acetyl-CoA ($0, 101).
Bais and D. B. Keech, personal communication (1971). 85. M. R. Young, B. Tolbert, M. F. Utter, and R. C. Valentine, unpublished observations (1970) (manuscript in preparation). 86. R. Cohcn, B. Giraud, and A. Messiah, Biopolymers 5, 203 (1967). 87. R. C. Valentine, N. G . Wrigley, M. C. Scrutton, J. J. Iriaa, and M. F. Utter, Biochemistry 5, 3111 (1966). 1. 3. Electron micrographs of pyruvate carboxylases from (A) chicken liver and (B) S. cerevisiae. The micrographs shown were obtained by photographic superimposition of multiple images.
Carboxylation and Decarboxylation, (Nonoxidative) Isomerization, 3rd Edition by Paul D. Boyer