Article
Entropic nature of the interaction between promoter bound CRP mutants and RNA polymerase.
Biochemistry - 25 Feb 2003
Krueger Susan, Gregurick Susan, Shi Ying, Wang Shenglun, Wladkowski Brian D, Schwarz Frederick P
Abstract excerpt
The interaction between CRP, T127L, S128A, and CRP and RNA polymerase bound to a 104 bp synthetic promoter were determined by ITC at 298 K and ranges from a deltaG(b) degrees = 1.4 +/- 0.8 kJ mol(-)(1) (cAMP-ligated S128A) to 4.5 +/- 0.3 kJ mol(-)(1) (cAMP-ligated double mutant CRP) with endothermicities that range from 4 +/- 3 kJ mol(-)(1) (cAMP-ligated CRP) to 47 +/- 8 kJ mol(-)(1) (cGMP-ligated T127L). The...
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