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Thermodynamic model of APE1 interactions with nonspecific DNA. For the enzyme subsites interacting with the cleaved strand, the ΔG° values characterizing their contacts with the d(pA)n chain of d(pA)n·d(pT)n are given; for the subsites interacting with the noncleaved strand, the ΔG° values refer to their contacts with the d(pT)n chain. All types of nonspecific additive interactions of APE1 with the d(pA)n·d(pT)n duplex provide ΔG° ∼ −7.96 kcal/mol.
