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. 1976 Jul;73(7):2245-8.
doi: 10.1073/pnas.73.7.2245.

Chloroplast coupling factor 1: A species-specific receptor for tentoxin

J A Steele  1 , T F Uchytil, R D Durbin, P Bhatnagar, D H Rich
Affiliations

Chloroplast coupling factor 1: A species-specific receptor for tentoxin

J A Steele et al. Proc Natl Acad Sci U S A. 1976 Jul.

Abstract

Tentoxin, a cyclic tetrapeptide, induces chlorosis in certain plant species. It inactivated photophosphorylation and coupling factor 1 (CF(1)) ATPase in lettuce, a sensitive species. This effect was due to binding of tentoxin with CF(1) at a single site (affinity constant 1.3 to 20 x 10(7) M(-1)). Neither AMP nor adenyl-5'-yl imidodiphosphate appeared to bind to this site. In radish, an insensitive species, 20 times more tentoxin was required for 50% inhibition of photophosphorylation. In this species CF(1) ATPase was unaffected by tentoxin, and its CF(1) bound tentoxin only weakly (affinity constant less than 1 x 10(4) M(-1)). Sensitivity of photophosphorylation to tentoxin was correlated with chlorosis sensitivity in six other species examined.

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References

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