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Protein-induced DNA bending is an important element in the structure of many protein-DNA complexes, including those involved in replication, transcription, and recombination. To understand these structures, the path followed by the DNA in each complex must be established. We have generated an empirical relation between the degree of bending and the altered electrophoretic mobility in polyacrylamide gels that allows estimation of protein-induced bends. This technique has been used to analyze 17 different protein-DNA complexes formed by six proteins including the four proteins involved in lambda site-specific recombination. The simplicity of this technique should make it useful in estimating angles for the construction of models of protein-DNA complexes and readily applicable to many systems where questions of higher-order structure are important for understanding function.

Empirical estimation of protein-induced DNA bending angles: applications to λ site-specific recombination complexes