Effect of Drought on Ribulose Bisphosphate Carboxylase/Oxygenase Activity in Soya Bean and Oil Palm Leaf Tissues

1984 ◽  
pp. 411-413 ◽  
Author(s):  
J. Vieira Da Silva ◽  
O. Rouault ◽  
H. Kpavode ◽  
A. Pham Thi
Keyword(s):  
Oil Palm ◽  
Soya Bean ◽  
Ribulose Bisphosphate Carboxylase ◽  
Ribulose Bisphosphate ◽  
Bisphosphate Carboxylase ◽  
Oxygenase Activity ◽  
Ribulose Bisphosphate Carboxylase Oxygenase ◽  
Leaf Tissues ◽  
Palm Leaf

scholarly journals Effects of manganese ions and magnesium ions on the activity of soya-bean ribulose bisphosphate carboxylase/oxygenase

1979 ◽  
Vol 183 (3) ◽  
pp. 747-750 ◽  
Author(s):  
J T Christeller ◽  
W A Laing
Keyword(s):  
Gas Phase ◽  
Soya Bean ◽  
Ribulose Bisphosphate Carboxylase ◽  
Magnesium Ions ◽  
Manganese Ions ◽  
Ribulose Bisphosphate ◽  
Bivalent Cation ◽  
Bisphosphate Carboxylase ◽  
Ribulose Bisphosphate Carboxylase Oxygenase ◽  
Michaelis Constants

The Michaelis constants of soya-bean ribulose bisphosphate carboxylase for CO2 in the carboxylation reaction and for O2 in the oxygenation reaction depend on the nature of the bivalent cation present. In the presence of Mg2+ the Km for bicarbonate is 2.48 mM, and the Km for O2 is 37% (gas-phase concentration). With Mn2+ the values decrease to 0.85 mM and 1.7% respectively. For the carboxylation reaction Vmax. was 1.7 mumol/min per mg of protein with Mg2+ but only 0.29 mumol/min per mg of protein with Mn2+. For the oxygenation reaction, Vmax. values were 0.61 and 0.29 mumol/min per mg of protein respectively with Mg2+ and Mn2+.

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