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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Influence of adenine nucleotides on the inhibition of photophosphorylation in spinach chloroplasts by N-ethylmaleimide.

The incubation of spinach chloroplasts with 1 mM N-ethylmaleimide in light for 60 to 90 s results in a partial, irreversible inhibition of photophosphorylation. The inhibition was not overcome at infinite light intensity or at infinite concentrations of the phosphorylation substrates. Although the inhibition diminished with decreasing concentrations of adenosine diphosphate in the assay of phosphorylation, the inhibition of guanosine diphosphate phosphorylation was independent of the concentration of this nucleotide. Although adenosine di- or triphosphate (10 to 30 muM) alone partially prevented the development of the N-ethylmaleimide inhibition of phosphorylation, these nucleotides were more effective when either 1 mM inorganic phosphate or arsenate was also present. The light-dependent incorporation of N-ethylmaleimide into chloroplast-bound coupling factor 1 was affected by adenosine triphosphate and inorganic phosphate in a manner similar to the onset of N-ethylmaleimide inhibition. Since guanosine diphosphate did not protect phosphorylation from N-ethylmaleimide inhibition but is phosphorylated at rapid rates, it is apparent that coupling factor 1 in chloroplasts has multiple nucleotide recognition sites.[1]


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