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The selective recognition of mismatched d(GCGAGC)_2 by the cobalt(III) complex

Science China Chemistry 2005年第1期48卷 58-66页

作者： CHEN Huili YANG Pin Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education Institute of Molecular Science Shanxi University Taiyuan 030006 China Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education Institute of Molecular Science Shanxi University Taiyuan 030006 China

We studied the binding of [Co(phen)2(HPIP)]Cl3 to mismatched d(GCGAGC)2 con- taining two sheared G:A mispairs by NMR. The result shows that the complex was intercalated into G:A region from the minor groove and extended to the major groove, and could selectively recognize the mispairs. 31P NMR indicates that the complex binding induced the change of the phosphate backbone in the mismatched base pairs region.

关键词： cobalt complex, mismatched DNA, mispairing recognition.

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Effect of Warm Ionized Plasma Medium on Radiation Properties of mismatched Microstrip Termination

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Journal of Electromagnetic Analysis and Applications 2009年第3期1卷 181-186页

作者： Ayman Al- SAWALHA Physics Department College of Science King Faisal University

Study of radiation properties of mismatched microstrip termination is carried out in warm ionized electron plasma medium. Linearised hydrodynamic theory coupled with vector wave technique is used to investigate radiation patterns and radiated power of a microstrip mismatched termination in one component electron plasma media for different plasma to source frequencies .These properties are used to compare the performance of an open circuit discontinuity with those of matched microstrip termination. Matched terminations are found more suitable for applications at higher frequencies than an open circuit discontinuity in the plasma medium though in free space they are less suitable.

关键词： mismatched Termination Open Circuit Discontinuity Matched Microstrip Termination Ionized Plasma

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Molecular modeling on the recognition of DNA sequence and conformational repair of sheared DNA by novel chiral metal complex D, L-[Co(phen)_(2)hpip]^(3+)

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Science China Chemistry 2006年第2期49卷 177-185页

作者： WU Yanbo ZHANG Cuiping YANG Pin Institute of Molecular Science Key Laboratory of Chemical Biology of Molecular Engineering of Ministry of Education Shanxi University Taiyuan 030006 China Institute of Molecular Science Key Laboratory of Chemical Biology of Molecular Engineering of Ministry of Education Shanxi University Taiyuan 030006 China Institute of Molecular Science Key Laboratory of Chemical Biology of Molecular Engineering of Ministry of Education Shanxi University Taiyuan 030006 China

A study on the recognition of DNA sequence and conformational repair of sheared DNA by Novel Chiral Metal complex D,L-[Co(phen)2hpip]3+ (phen=1,10 phenanthroline, hpip=2-[2-hydroxyphenyl] imidazole [4,5-f][1,10] phenanthroline) is carried out with molecular simula-tions. The results reveal that two isomers of the complex could both recognize the normal DNA in the minor groove orientation, while recognize the sheared DNA in the major groove orientation and both isomers could convert the conformation of mismatched bases from sheared form to parallel form. Further analysis shows that the steric details of complex’s intercalation to base stack determine the results of recognition, which is induced by the steric collision among ancillary ligand phen, bases and DNA backbone, and by the steric crowding occurring in the process of structural expansion of bases and DNA backbone. Detailed analysis reveals that the conformational repair of mismatched bases relates not only to the steric interactions, but also to the π-π stack among normal bases, mismatched bases and hpip ligand.

关键词： mismatched DNA, metal complex, molecular modeling, docking.

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