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. 1976 Jul;73(7):2245–2248. doi: 10.1073/pnas.73.7.2245

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

John A Steele *, Thomas F Uchytil *, Richard D Durbin *, Pradip Bhatnagar †, Daniel H Rich †
PMCID: PMC430514  PMID: 16592333

Abstract

Tentoxin, a cyclic tetrapeptide, induces chlorosis in certain plant species. It inactivated photophosphorylation and coupling factor 1 (CF1) ATPase in lettuce, a sensitive species. This effect was due to binding of tentoxin with CF1 at a single site (affinity constant 1.3 to 20 × 107 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 CF1 ATPase was unaffected by tentoxin, and its CF1 bound tentoxin only weakly (affinity constant less than 1 × 104 M-1). Sensitivity of photophosphorylation to tentoxin was correlated with chlorosis sensitivity in six other species examined.

Keywords: cyclic peptide, phytotoxin, disease resistance

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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