Table 1.

DNA binding affinities obtained for HlyU

	Ka [x 109 M−1]a
HlyU reduced	0.40 ± 0.08 (n = 4)
HlyU, GSSH treated	0.009 ± 0.005 (n = 2)
HlyU, H2O2 treated	0.19 ± 0.03 (n = 3)

^aErrors correspond to standard deviations of the mean for n number of experiments carried out under the same conditions: 25 mM HEPES, pH = 7.0, 100 mM NaCl, 1 mM EDTA, 25°C. The treatment corresponds to a 5-fold addition relative to the protein subunit concentration.