Representation of the crystal structure o/Escherichia coli CAP'DNA complex. The transcription 
factor, catabolite activator protein (CAP), is represented as an a-carbon backbone in blue. 
Bound cAMP is shown in red. The 30- bp DNA bound to CAP in the crystal is shown in partial 
space filling representation with the bases in light blue and the sugar phosphate backbone in 
yellow. The DNA is bent 90° by CAP binding, initiated primarily at two 40° kinks. 
Research of Thomas A. Steitz. 
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