Quantity and Kinetic Properties of Ribulose 1,5-Bisphosphate Carboxylase in C_3, C_4, and C_3-C_4 Intermediate Species of Flaveria (Asteraceae)

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概要

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• 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. C_4 plants are considered to have a higher concentration of CO_2 available to RuBPC than C_3 plants. In this study, the K_m(CO_2) and catalytic capacity (k_<cat>) of RuBPC and the ratio of RuBPC protein to total soluble protein from several Flaveria species, including C_3, C_3-C_4 intermediate, and C_4 species, were determined. The C_3 and intermediate species had similar K_m(CO_2) values while the C_4 species on average had higher K_m(CO_2) values. The mean ratio of k_<cat>/K_m for species of each group was similar, supporting the hypothesis that changes in K_m and k_<cat> are linked. The allocation of total soluble protein to RuBPC was lowest in the C_4 Flaveria species, intermediate in the C_3-C_4 species, and highest in the C_3 species. The results suggest that during evolution of C_4 photosynthesis adjustments may occur in the quantity of RuBPC prior to changes in its kinetic properties.

• 日本植物生理学会の論文

著者

• Ku Maurice

  Botany Department Washington State University

• Ku Maurice

  Botany Dep. Washington State Univ.

• Edwards Gerald

  Botany Department Washington State University

• Edwards Gerald

  Botany Department And Institute Of Biological Chemistry Washington State University

• Wessinger Mary

  Botany Department Washington State University

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• Quantity and Kinetic Properties of Ribulose 1,5-Bisphosphate Carboxylase in C_3, C_4, and C_3-C_4 Intermediate Species of Flaveria (Asteraceae)
• PEP Carboxylases from Two C_4 Species of Panicum with Markedly Different Susceptibilities to Cold Inactivation

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