UV absorption and circular dichroism calculations of three Drosophila virilis satellite DNA’s: Use of linear response polarizability theory

Assuming the Fano–DeVoe-type of model Hamiltonian which is capable of involving usual cases of copolymer systems, the polymer polarizability tensor has been derived in terms of the electronic state wave functions for identical and nonidentical constituent monomers. A prescription is presented as to how to simply involve the polarizability tensors of sugar–phosphate residues into the total polymer polarizability tensor. Within the dipole–dipole approximation, a detailed computational procedure is given for obtaining the polymer polarizability tensor from monomer spectroscopic data. The calculations of UV and CD band shapes have been carried out on highly repeating DNA’s such as Drosophila virilis satellite DNA’s I, II, and III, i.e., poly[d(CAAACTA)]⋅poly[d(TAGTTTG)], poly[d(TAAACTA)]⋅poly[d(TAGTTTA)], and poly[d(CAAATTA)]⋅poly[d(TAATTTG)].