Pramana

, 90:58 | Cite as

Envisaging quantum transport phenomenon in a muddled base pair of DNA

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Abstract

The effect of muddled base pair on electron transfer through a deoxyribonucleic acid (DNA) molecule connected to the gold electrodes has been elucidated using tight binding model. The effect of hydrogen and nitrogen bonds on the resistance of the base pair has been minutely observed. Using the semiempirical extended Huckel approach within NEGF regime, we have determined the current and conductance vs. bias voltage for disordered base pairs of DNA made of thymine (T) and adenine (A). The asymmetrical behaviour amid five times depreciation in the current characteristics has been observed for deviated Au–AT base pair–Au devices. An interesting revelation is that the conductance of the intrinsic AT base pair configuration attains dramatically high values with the symmetrical zig-zag pattern of current, which clearly indicates the transformation of the bond length within the strands of base pair when compared with other samples. A thorough investigation of the transmission coefficients T(E) and HOMO–LUMO gap reveals the misalignment of the strands in base pairs of DNA. The observed results present an insight to extend this work to build biosensing devices to predict the abnormality with the DNA.

Keywords

Charge transfer DNA EHT quantum transport scattering of atoms 

PACS Nos

34.70.+e 34.50.−s 05.60.Gg 31.15.Ct 87.14.gk 

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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  1. 1.Guru Nanak Dev UniversityAmritsarIndia

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