By Harry Smith
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Extra resources for Commentaries in Plant Science
D. Spinach ribulose diphosphate carboxylase. I. Purification and properties of the enzyme. Biochemistry 5 (1966) 2350-2357. 49. I. Photosynthesis and related processes. V o l . II Pt. 2. Interscience, New York (1956) p. 1313. 50. C. Estimation of the molecular weight of ribulose diphosphate carboxylase subunits. Biochem. biophys. Res. Commun.
J. Plant photorespiration — an inevitable consequence of the existence of atmospheric oxygen. Nature 243 (1973) 359-360. 41. J. E. Ribulose diphosphate oxygenase. I I . Further proof of reaction products and mechanism of action. Biochemistry 12 (1973) 18-23. 42. W. P. The localisation of Fraction I protein of green leaves in the chloroplasts. Archs. Biochem. Biophys. 73 (1958) 120-126. 43. , A K A Z A W A , T. and M I Y A C H I , S. Structure and functions of chloroplast proteins. IX. Further comparative studies on Chlorella and spinach leaf ribulose 1,5-diphosphate carboxylase.
However, an 61 ingenious scheme by Werdan and H e i d t suggests how this increase in HCO3 concentration leads to an increase in the rate of CO2 fixation. They propose that around the catalytic sites of the carboxylase the formation of 3-phosphoglycerate 58 lowers the p H , and thus increases locally the CO2 concentration. W a l k e r has pointed out that this idea is consistent with the observation that a ten-fold increase 2+ in M g concentration shifts the pH optimum of the isolated carboxylase about 1 unit to the acid side.
Commentaries in Plant Science by Harry Smith