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

AUTOR(ES)

Steele, John A.

RESUMO

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.

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