Abstract
Isolated spinach CF1 (chloroplast coupling factor 1) forms enzyme-bound ATP without any supply of energy in the presence of high concentrations of Pi [Feldman and Sigman (1982) J Biol Chem 257: 1676-1683]. The final amount of CF1-bound ATP synthesized was increased greatly by 1,2-propanediol, and moderately by methanol, ethanol, and dimethyl sulfoxide, but decreased by glycerol and octyl glucoside. Methanol and ethanol greatly increased the initial rate of ATP synthesis, while 1,2-propanediol increased it only moderately. Low concentrations (10-8 -10-6 M) of tentoxin, which inhibit ATPase activity of isolated CF1, did not affect enzyme-bound ATP synthesis. However, high concentrations (>10-5 M) of tentoxin, which stimulate ATPase activity of isolated CF1, enhanced the initial rate of CF1-bound ATP synthesis without significant effect on the final amount of ATP synthesized in the presence of medium ADP. The substrate of enzyme-bound ATP synthesized came largely from tightly bound ADP, not medium ADP, and tentoxin did not affect this substrate profile. Tentoxin did not affect the binding of medium ADP to high affinity sites on CF1.
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Mochimaru, M., Sakurai, H. Effects of organic solvents and tentoxin on enzyme-bound ATP synthesis in isolated chloroplast coupling factor 1. Photosynthesis Research 57, 305–315 (1998). https://doi.org/10.1023/A:1005973801028
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DOI: https://doi.org/10.1023/A:1005973801028