Abstract
A new set of stiffness parameters for all the 32trinucleotide units has been set up directly from thethree dimensional structures of DNA molecules. It wasobserved that GAC/GTC is the stiffest trinucleotideand ACC/GGT is the most flexible one. The averagestiffness values computed for a set of operatorsequences using the new parameters correlate very wellwith the protein-DNA binding specificity and bindingfree energy change of 434 repressor and Cro repressor,respectively. The new structure based stiffness scalecan explain the protein-DNA binding specificity to thelevel of 0.92.
Keywords: DNA structure, protein-DNA binding, sequence dependent, stiffness scale, Young's modulus
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