Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase from Thermophilic Red Algae with a Strong Specificity for CO 2 Fixation

Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase from Thermophilic Red Algae with a Strong... Strongly carboxylase-specific ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) was found in Galdieria partita and Cyanidium caldarium (Cyanidiophyceae). The relative specificity, V c K o / V o K c , of Galdieria and Cyanidium RuBisCO was 238 and 222, respectively; 2.4 to 2.5-fold that of higher plant RuBisCOs. The apparent K m of RuBisCO from the thermophilic red algae for CO 2 was 6 to 7 μ m and the smallest of the values reported so far for other RuBisCOs. The pre-rhodophyte Porphiridium purpureum, which lives at moderate temperatures, had RuBisCO with the relative specificity value of 144. A large difference (5.2 kcal·mol −1 ) in the activation energies between the carboxylase and oxygenase activities in Galdieria RuBisCO was a cause of the strong specificity for the carboxylase activity. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Biochemical and Biophysical Research Communications Elsevier

Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase from Thermophilic Red Algae with a Strong Specificity for CO 2 Fixation

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Publisher
Elsevier
Copyright
Copyright © 1997 Academic Press
ISSN
0006-291x
D.O.I.
10.1006/bbrc.1997.6497
Publisher site
See Article on Publisher Site

Abstract

Strongly carboxylase-specific ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) was found in Galdieria partita and Cyanidium caldarium (Cyanidiophyceae). The relative specificity, V c K o / V o K c , of Galdieria and Cyanidium RuBisCO was 238 and 222, respectively; 2.4 to 2.5-fold that of higher plant RuBisCOs. The apparent K m of RuBisCO from the thermophilic red algae for CO 2 was 6 to 7 μ m and the smallest of the values reported so far for other RuBisCOs. The pre-rhodophyte Porphiridium purpureum, which lives at moderate temperatures, had RuBisCO with the relative specificity value of 144. A large difference (5.2 kcal·mol −1 ) in the activation energies between the carboxylase and oxygenase activities in Galdieria RuBisCO was a cause of the strong specificity for the carboxylase activity.

Journal

Biochemical and Biophysical Research CommunicationsElsevier

Published: Apr 17, 1997

References

  • Planta
    Dai, Z.; Ku, M.S.B.; Edwards, G.E.

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