Table 2. Calculated and experimental cAMP affinities for GlxR proteins.
GlxR Protein | K 2/K 1 (ENM) | Mean K 2/K 1 (ITC) | S.E.M. (n) | p Value |
Wild-type | 2.37 | 19.47 | 1.12 (18) | - |
L134V k L134/k = 0.25 | 2.07 | 4.34 | 0.21 (26) | <0.001 |
A131V k A131/k = 4 | 2.05 | 4.36 | 0.21 (30) | <0.001 |
The ratio of the second to first dissociation constants for cAMP (K 2/K 1) for wild-type and mutant GlxR proteins were calculated from the ENM or obtained by ITC. The p value is for a comparison of means to the wild-type.