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PLANT PHYSIOLOGY , Vol 102, Issue 4 1119-1128, Copyright © 1993 by American Society of Plant Biologists

MOLECULAR BIOLOGY AND GENE REGULATION

Reduction of Ribulose Bisphosphate Carboxylase Activase Levels in Tobacco (Nicotiana tabacum) by Antisense RNA Reduces Ribulose Bisphosphate Carboxylase Carbamylation and Impairs Photosynthesis

C. J. Mate, G. S. Hudson, S. von Caemmerer, J. R. Evans and T. J. Andrews
Plant Environmental Biology (C.J.M., S.v.C., J.R.E., T.J.A.) and Cooperative Research Centre for Plant Science (G.S.H., T.J.A.), Research School of Biological Sciences, Australian National University, PO Box 475, Canberra, Australian Capital Territory 2601, Australia

The in vivo activity of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) is modulated in response to light intensity by carbamylation of the active site and by the binding of sugar phosphate inhibitors such as 2[prime]-carboxyarabinitol-1-phosphate (CA1P). These changes are influenced by the regulatory protein Rubisco activase, which facilitates the release of sugar phosphates from Rubisco' catalytic site. Activase levels in Nicotiana tabacum were reduced by transformation with an antisense gene directed against the mRNA for Rubisco activase. Activase-deficient plants were photosynthetically impaired, and their Rubisco carbamylation levels declined upon illumination. Such plants needed high CO2 concentrations to sustain reasonable growth rates, but the level of carbamylation was not increased by high CO2. The antisense plants had, on average, approximately twice as much Rubisco as the control plants. The maximum catalytic turnover rate (kcat) of Rubisco decreases in darkened tobacco leaves because of the binding of CA1P. The dark-to-light increase in kcat that accompanies CA1P release occurred to similar extents in antisense and control plants, indicating that normal levels of activase were not essential for CA1P release from Rubisco in the antisense plants. However, CA1P was released in the antisense plants at less than one-quarter of the rate that it was released in the control plants, indicating a role for activase in accelerating the release of CA1P.


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