Photosynthesis Research

, Volume 37, Issue 1, pp 81–86 | Cite as

A facile method to determine the CO2/O2 specificity factor for ribulose bisphosphate carboxylase/oxygenase

  • Garrett J. Lee
  • Roumen V. Kostov
  • Bruce A. McFadden
Technical Communication

Abstract

A rapid method to determine the CO2/O2 specificity factor of ribulose 1,5-bisphosphate carboxylase/oxygenase is presented. The assay measures the amount of CO2 and O2 fixation at varying CO2/O2 ratios to determine the relative rates of each reaction. CO2 fixation is measured by the incorporation of the moles of14CO2 into 3-phosphoglycerate, while O2 fixation is determined by subtraction of the moles of CO2 fixed from the moles of RuBP consumed in each reaction. By analyzing the inorganic phosphate specifically hydrolyzed from RuBP under alkaline conditions, the amount of RuBP present before and after catalysis by rubisco can be determined.

Key words

ribulose 1,5-bisphosphate assay rubisco specificity factor tau 

Abbreviations

3-PGA

3-phosphoglyceric acid

HEPPS

N-(2-hydroxyethyl)piperazine-N′-(3-propanesulfonic acid)

rubisco-ribulose

1,5-bisphosphate carboxylase/oxygenase

RuBP

d-ribulose 1,5-bisphosphate

XuBP

d-xylulose 1,5-bisphosphate

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Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • Garrett J. Lee
    • 1
  • Roumen V. Kostov
    • 1
  • Bruce A. McFadden
    • 1
  1. 1.Department of Biochemistry and BiophysicsWashington State UniversityPullmanUSA

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