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Brønsted analysis of C76Δ cleavage activity with imidazole
analogues. (A) The apparent second-order rate constant
as a function of pH. The
apparent pKa of each reaction is labeled for 4-methylimidazole
(squares), imidazole (circles), 4-hydroxymethylimidazole (diamonds),
and 3-amino-1,2,4-triazole (triangles). (B) The
Brønsted plot of C76Δ cleavage in the buffers shown in
A; Brønsted coefficient β of 0.51 is determined from
the slope (n = 4; r = 0.96).
