Abstract
Complete stoichiometry of the reaction catalyzed by ribulose 1,5-bisphosphate (RuBP) oxygenase from spinach and Rhodospirillum rubrum has been determined. Before initiation and after termination, RuBP has been measured either by release of equimolar orthophosphate at 25°C in the presence of 1 n NaOH or by complete carboxylation using 14CO2 and RuBP carboxylase. The RuBP-dependent oxygen consumption has been measured continuously with an oxygen electrode. After termination of catalysis, 3-phosphoglycerate production has been determined spectrophotometrically using phosphoglycerokinase, glyceraldehyde-3-phosphate dehydrogenase, triose phosphate isomerase, α-glycerophosphate dehydrogenase, ATP, and NADH. To measure phosphoglycolate, this product was first hydrolyzed with alkaline phosphatase and the resultant glycolate oxidized by glycolate oxidase. Attendant H2O2 formation catalyzed by peroxidase has then been measured colorimetrically. Interference by ribulose in the measurement of glycolate can be easily corrected. Procedures are rapid and do not require separation of reactants and products. Results are in excellent accord with the expected stoichiometry for catalysis by RuBP oxygenase and also enable an estimate of competing catalysis by RuBP carboxylase.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 158-166 |
| Number of pages | 9 |
| Journal | Analytical Biochemistry |
| Volume | 124 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jul 15 1982 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Biochemistry
- Biophysics
- Molecular Biology
Cite this
Stoichiometry in the assay of ribulose bisphosphate oxygenase and carboxylase. / Purohit, K.; McFadden, B. A.; Saluja, Ashok.
In: Analytical Biochemistry, Vol. 124, No. 1, 15.07.1982, p. 158-166.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Stoichiometry in the assay of ribulose bisphosphate oxygenase and carboxylase
AU - Purohit, K.
AU - McFadden, B. A.
AU - Saluja, Ashok
PY - 1982/7/15
Y1 - 1982/7/15
N2 - Complete stoichiometry of the reaction catalyzed by ribulose 1,5-bisphosphate (RuBP) oxygenase from spinach and Rhodospirillum rubrum has been determined. Before initiation and after termination, RuBP has been measured either by release of equimolar orthophosphate at 25°C in the presence of 1 n NaOH or by complete carboxylation using 14CO2 and RuBP carboxylase. The RuBP-dependent oxygen consumption has been measured continuously with an oxygen electrode. After termination of catalysis, 3-phosphoglycerate production has been determined spectrophotometrically using phosphoglycerokinase, glyceraldehyde-3-phosphate dehydrogenase, triose phosphate isomerase, α-glycerophosphate dehydrogenase, ATP, and NADH. To measure phosphoglycolate, this product was first hydrolyzed with alkaline phosphatase and the resultant glycolate oxidized by glycolate oxidase. Attendant H2O2 formation catalyzed by peroxidase has then been measured colorimetrically. Interference by ribulose in the measurement of glycolate can be easily corrected. Procedures are rapid and do not require separation of reactants and products. Results are in excellent accord with the expected stoichiometry for catalysis by RuBP oxygenase and also enable an estimate of competing catalysis by RuBP carboxylase.
AB - Complete stoichiometry of the reaction catalyzed by ribulose 1,5-bisphosphate (RuBP) oxygenase from spinach and Rhodospirillum rubrum has been determined. Before initiation and after termination, RuBP has been measured either by release of equimolar orthophosphate at 25°C in the presence of 1 n NaOH or by complete carboxylation using 14CO2 and RuBP carboxylase. The RuBP-dependent oxygen consumption has been measured continuously with an oxygen electrode. After termination of catalysis, 3-phosphoglycerate production has been determined spectrophotometrically using phosphoglycerokinase, glyceraldehyde-3-phosphate dehydrogenase, triose phosphate isomerase, α-glycerophosphate dehydrogenase, ATP, and NADH. To measure phosphoglycolate, this product was first hydrolyzed with alkaline phosphatase and the resultant glycolate oxidized by glycolate oxidase. Attendant H2O2 formation catalyzed by peroxidase has then been measured colorimetrically. Interference by ribulose in the measurement of glycolate can be easily corrected. Procedures are rapid and do not require separation of reactants and products. Results are in excellent accord with the expected stoichiometry for catalysis by RuBP oxygenase and also enable an estimate of competing catalysis by RuBP carboxylase.
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U2 - 10.1016/0003-2697(82)90233-0
DO - 10.1016/0003-2697(82)90233-0
M3 - Article
C2 - 6751151
AN - SCOPUS:0020483579
VL - 124
SP - 158
EP - 166
JO - Analytical Biochemistry
JF - Analytical Biochemistry
SN - 0003-2697
IS - 1
ER -