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Report No.

Impact of radiation damage on DNA determined by computational simulation

Pinak, M.

Review of molecular dynamics (MD) studies of several radiation-originated lesions on DNA molecules is presented. Main focus is to describe structural and energy changes in DNA molecule with the respect to proper recognition of the lesion by respective repair enzyme. In most cases the observed changes are related to overall collapsing of the double helical structure around the lesion and are considered to facilitate docking of the repair enzyme into the DNA and formation of DNA-enzyme complex. Stable DNA-enzyme complex is necessary condition for the onset of entire enzymatic repair process. In addition to the structural changes, specific values of electrostatic interaction energy are detected at several lesion sites. The specific electrostatic energy is considered as a factor that enables repair enzyme to discriminate lesion from native, non-damaged site.



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