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© Oxford University Press

CURVATURE: software for the analysis of curved DNA

E.S. Shpigelman 1, E.N. Trifonov 2 and A. Bolshoy 1,2

1Gene Structure Research Center, The College of Judea and Samaria Kedumim-Ariel 44804
2Department of Structural Biology, Weizmann Institute of Science Rehovot 76100, Israel

Software is presented to plot the sequence-dependent spatial trajectory of the DNA double helix and/or distribution of curvature along the DNA molecule. The nearest-neighbor wedge model is implemented to calculate overall DNA path using local helix parameters: helix twist angle, wedge (deflection) angle and direction (of deflection) angle. The procedures described proved to be very convenient as tools for investigation of a relationship between overall DNA curvature and its gel electrophoretic mobility. All parameters of the model had been estimated from experimental data. Using these wedge parameters the program takes, as input, any DNA sequence and calculates the likely degree of curvature at each point along the molecule. This information is displayed both graphically and in the form of simplified representations of curved double helices. The Software, CURVATURE, can thus be used to investigate possible roles of curvature in modulation of gene expression and for location of curved portions of DNA, which may play an important role in sequence-specific protein-DNA interactions.

Received on September 7, 1992; accepted on January 25, 1993

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