Titration of Sso7d with 1-anilinonaphthalene-8-sulfonic acid
(ANS). Details are provided in the Materials and methods. (A)
Fluorescence emission spectra of 0.1, 0.8, 1.5, 3, 5, 7, 10 and
12 µM ANS (solid lines, from bottom to top) in the presence
of 2 µM Sso7d; the spectrum of ANS alone is also reported
(broken line). (B) Fluorescence titration curve of Sso7d with
ANS; the inset shows the double-reciprocal plot of fluorescence
titration data.