title: Binding of DNA nucleobases and nucleosides with graphene.
abstract: Interaction of two different samples of graphene with DNA nucleobases and nucleosides is investigated by isothermal titration calorimetry. The relative interaction energies of the nucleobases decrease in the order guanine (G)>adenine (A)>cytosine (C)>thymine (T) in aqueous solutions, although the positions of C and T seem to be interchangeable. The same trend is found with the nucleosides. Interaction energies of the A-T and G-C pairs are somewhere between those of the constituent bases. Theoretical calculations including van der Waals interaction and solvation energies give the trend G>A approximately T>C. The magnitudes of the interaction energies of the nucleobases with graphene are similar to those found with single-walled carbon nanotubes.
authors.affiliation: Chemistry and Physics of Materials Unit, DST nanoscience unit and CSIR Centre of Excellence in Chemistry, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P. O., Bangalore 560064, India.
authors.forename: Neenu
authors.initials: N
authors.lastname: Varghese
authors.forename: Umesha
authors.initials: U
authors.lastname: Mogera
authors.forename: Achutharao
authors.initials: A
authors.lastname: Govindaraj
authors.forename: Anindya
authors.initials: A
authors.lastname: Das
authors.forename: Prabal K
authors.initials: PK
authors.lastname: Maiti
authors.forename: Ajay K
authors.initials: AK
authors.lastname: Sood
authors.forename: C N R
authors.initials: CN
authors.lastname: Rao
mesh_terms: D000225:Adenine / Q000737:chemistry*; D003596:Cytosine / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D006147:Guanine / Q000737:chemistry*; D009705:Nucleosides / Q000737:chemistry*; D013816:Thermodynamics; D013941:Thymine / Q000737:chemistry*
chemical_list: D009705:Nucleosides; D006147:Guanine; D006108:Graphite; D003596:Cytosine; D000225:Adenine; D013941:Thymine