/lp/oxford-university-press/quantity-and-kinetic-properties-of-ribulose-1-5-bisphosphate-hTTdSqbAoH
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- Publisher
- Oxford University Press
- Copyright
- © 1989 The Japanese Society of Plant Physiologists (JSPP)
- ISSN
- 0032-0781
- eISSN
- 1471-9053
- DOI
- 10.1093/oxfordjournals.pcp.a077791
- Publisher site
- See Article on Publisher Site
Abstract
Abstract The kinetic properties of ribulose 1,5-bisphosphate carboxylase (RuBPC) appear to have been modified during evolution of photosynthesis to adjust to changes in substrate availability. C4 plants are considered to have a higher concentration of CO2 available to RuBPC than C3plants. In this study, the Km(CO2 and catalytic capacity (kcat) of RuBPC and the ratio of RuBPC protein to total soluble protein from several Flaveria species, including C3, C3-C4 intermediate, and C4 species, were determined. The C3 and intermediate species had similar Km(CO2) values while the C4 species on average had higher Km(CO2) values. The mean ratio of Kcat/Km for species of each group was similar, supporting the hypothesis that changes in Km and Kcat, are linked. The allocation of total soluble protein to RuBPC was lowest in the C4Flaveria species, intermediate in the C3-C4 species, and highest in the C3 species. The results suggest that during evolution of C4 photosynthesis adjustments may occur in the quantity of RuBPC prior to changes in its kinetic properties. This content is only available as a PDF. © 1989 The Japanese Society of Plant Physiologists (JSPP)
Journal
Plant and Cell Physiology – Oxford University Press
Published: Jul 1, 1989