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The addition of 7-chloro-4-nitrobenzofurazan (NBD) to isolated CF 1  at pH 7.5 leads to one tyrosine-bound NBD molecule per CF 1  in one of the three β-subunits, concomittantly with the inhibition of the ATPase activity. Addition of ADP prior to NBD -incubation protected the ATPase activity and reduced binding of NBD to β-subunits. The addition of MgATP prior to modification did not result in protection against modification of the β-subunit as well as preservation of activity. Cleavage of the NBD -labelled subunits with cyanogen brom ide, follow ed by analysis of the labelled peptides, led to detection of a  14 C-labelled peptide of 7 kDa in both cases (± ATP -preincubation). Sequence analysis of this peptide showed that in ATP-incubated CF 1 , tyrβ328 was modified with NBD-C1, whereas the ATP free sample contained no NBD bound to this tyrosine. Further digestion of the labelled peptide with protease V8 (Staphylococcus aureus) followed by sequence analysis of the radioactive labelled peptide, led to the detection of β-tyr362 as the modified amino acid in case of ATP-free CF 1 . Both tyrosines are closely related to a proposed nucleotide binding region of β

7-Chloro-4-nitrobenzofurazan Inactivates Chloroplast H + -ATPase by Modification of Different Tyrosines, Depending on the Presence of ATP