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1H chemical shifts vs. pH for titrating histidines in subtilisin N155A, its PMSF complex, and two major subtilisin autolysis products, J1 and J2. (A) Cɛ1-H 1H NMR data from two-dimensional 1H/13C HMQC NMR spectra of PMSF complex at 500 MHz and of J1 and J2 at 600 MHz. (B) Cδ2-H 1H NMR data from one-dimensional 13C-selective 1H NMR spectra of resting enzyme at 600 MHz.
