Barrier-free proton transfer in the valence anion of 2 '-deoxyadenosine-5 '-monophosphate. II. A computational study | |
Kobylecka, Monika1; Gu, Jiande2,3![]() | |
刊名 | JOURNAL OF CHEMICAL PHYSICS
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2008-01-28 | |
卷号 | 128期号:4 |
ISSN号 | 0021-9606 |
DOI | 10.1063/1.2823002 |
文献子类 | Article |
英文摘要 | The propensity of four representative conformations of 2'-deoxyadenosine-5'-monophosphate (5'-dAMPH) to bind an excess electron has been studied at the B3LYP/6-31++G(d,p) level. While isolated canonical adenine does not support stable valence anions in the gas phase, all considered neutral conformations of 5'-dAMPH form adiabatically stable anions. The type of an anionic 5'-dAMPH state, i.e., the valence, dipole bound, or mixed (valence/dipole bound), depends on the internal hydrogen bond(s) pattern exhibited by a particular tautomer. The most stable anion results from an electron attachment to the neutral syn-south conformer. The formation of this anion is associated with a barrier-free proton transfer triggered by electron attachment and the internal rotation around the C4'-C5' bond. The adiabatic electron affinity of the a_south-syn anion is 1.19 eV, while its vertical detachment energy is 1.89 eV. Our results are compared with the photoelectron spectrum (PES) of 5'-dAMPH(-) measured recently by Stokes , [J. Chem. Phys. 128, 044314 (2008)]. The computational VDE obtained for the most stable anionic structure matches well with the experimental electron binding energy region of maximum intensity. A further understanding of DNA damage might require experimental and computational studies on the systems in which purine nucleotides are engaged in hydrogen bonding. |
WOS关键词 | EXCESS ELECTRON-ATTACHMENT ; LOW-ENERGY ELECTRONS ; DNA-STRAND BREAKS ; MOLECULAR-ORBITAL METHODS ; GAUSSIAN-TYPE BASIS ; NUCLEIC-ACID BASES ; GAS-PHASE ; AB-INITIO ; PYRIMIDINE NUCLEOTIDES ; ORGANIC-MOLECULES |
WOS研究方向 | Chemistry ; Physics |
语种 | 英语 |
出版者 | AMER INST PHYSICS |
WOS记录号 | WOS:000252821200038 |
内容类型 | 期刊论文 |
源URL | [http://119.78.100.183/handle/2S10ELR8/273003] ![]() |
专题 | 药物发现与设计中心 |
通讯作者 | Kobylecka, Monika |
作者单位 | 1.Univ Gdansk, Fac Chem, PL-80952 Gdansk 18, Sobieskiego, Poland; 2.CAS, Shanghai Inst Mat Med, Drug Design & Discovery Ctr, Shanghai 201203, Peoples R China; 3.Jackson State Univ, Dept Chem, Computat Ctr Mol Struct & Interact, Jackson, MS 39217 USA |
推荐引用方式 GB/T 7714 | Kobylecka, Monika,Gu, Jiande,Rak, Janusz,et al. Barrier-free proton transfer in the valence anion of 2 '-deoxyadenosine-5 '-monophosphate. II. A computational study[J]. JOURNAL OF CHEMICAL PHYSICS,2008,128(4). |
APA | Kobylecka, Monika,Gu, Jiande,Rak, Janusz,&Leszczynski, Jerzy.(2008).Barrier-free proton transfer in the valence anion of 2 '-deoxyadenosine-5 '-monophosphate. II. A computational study.JOURNAL OF CHEMICAL PHYSICS,128(4). |
MLA | Kobylecka, Monika,et al."Barrier-free proton transfer in the valence anion of 2 '-deoxyadenosine-5 '-monophosphate. II. A computational study".JOURNAL OF CHEMICAL PHYSICS 128.4(2008). |
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