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PLANT PHYSIOLOGY , Vol 111, Issue 3 789-796, Copyright © 1996 by American Society of Plant Biologists
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BIOCHEMISTRY AND ENZYMOLOGY |
Oxidative Stress Induces Partial Degradation of the Large Subunit of Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase in Isolated Chloroplasts of Barley
M. Desimone, A. Henke and E. Wagner
Institut fur Biologie II, Universitat Freiburg, Schanzlestrasse 1, D-79104 Freiburg, Germany
The effects of oxidative stress on the degradation of
ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco; EC 4.1.1.39) were
studied in isolated chloroplasts from barley (Hordeum vulgare L. cv
Angora). Active oxygen (AO) was generated by varying the light intensity,
the oxygen concentration, or the addition of herbicides or
ADP-FeCl3-ascorbate to the medium. Oxidative treatments stimulated
association of Rubisco with the insoluble fraction of chloroplasts and
partial proteolysis of the large subunit (LSU). The most prominent
degradation product of the LSU of Rubisco showed an apparent molecular mass
of 36 kD. The data suggest that an increase in the amount of AO
photogenerated by O2 reduction at photosystem I triggers Rubisco
degradation. A possible relationship between AO-mediated denaturation of
Rubisco and proteolysis of the LSU is discussed.
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