期刊
JOURNAL OF MASS SPECTROMETRY
卷 38, 期 3, 页码 265-270出版社
WILEY
DOI: 10.1002/jms.436
关键词
metal ion affinity; nucleic acid bases; density functional computations
The most stable tautomeric forms of free DNA and RNA bases were considered as substrates for the interaction of Cu+ ion. Several suitable attachment sites were selected that involved mono- and bicoordination of the cation. B3LYP/6-311 + G(2df,2p) bond energies showed that copper ion has the major affinity for guanine and cytosine bases. The proposed values of Cu+ ion affinity are 59.9, 60.0, 80.2, 88.0 and 69.0 kcal mol(-1) for uracil, thymine, cytosine, guanine and adenine, respectively. The preference for the mono- or bi-coordination depends on the particular tautomer for each base. Copyright (C) 2003 John Wiley Sons, Ltd.
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