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Counter-ion effects of A- and B-type poly(dG)·Poly(dC) and poly(dA)·Poly(dT) DNA by elongation method

✍ Scribed by Peng Xie; Kai Liu; Fenglong Gu; Yuriko Aoki

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
886 KB
Volume
112
Category
Article
ISSN
0020-7608

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✦ Synopsis

Abstract

The elongation method was developed to calculate the local density of states (LDOS) at ab initio molecular orbital (MO) level. This method is performed on eight types of DNA molecules: namely, a pitch of A‐ and B‐ type poly(dA)·poly(dT) and poly(dG)·poly(dC), and they are neutralized by H^+^ and Na^+^, respectively. The difference of total energy between elongation and conventional calculations in each step is considerably small in the order of 10^−9^ hartree/atom for 20 units of B‐type poly(dA)·poly(dT) model. When the figures of total DOS of each model was compared, the energy gap of model containing Na^+^ is smaller than that of corresponding model containing H^+^. The LDOS for each model estimated by elongation method can well reproduce the results by conventional method. The LDOS figures show that the valence bands in A‐ and B‐type DNA are formed by the highest occupied MOs (HOMOs) of adenine/guanine. Na^+^ can greatly decrease the energy of lowest unoccupied MO (LUMO) and consequently decrease the energy gap between LUMO and HOMO. The electron transfer between stacking adenine/guanine and sodium would play an important role in the conductivity of A‐ and B‐type DNA. © 2011 Wiley Periodicals, Inc. Int J Quantum Chem, 2012

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