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alpha-Helix C-Terminus Acting as a Relay to Mediate Long-Range Hole Migration in Proteins
來源:陳效華教授個人網站 發(fā)布日期:2016-04-04
作者:Xiaohua Chen, Laibin Zhang, Liang Zhang, Wenming Sun, Zhenwei Zhang, Haiying Liu, Yuxiang Bu* and Ro
關鍵字:peptide helices; hole migration relay; peptide size dependence of ionization energies
論文來源:期刊
具體來源:J. Phys. Chem. Lett. 2010, 1 (10), 1637–1641.
發(fā)表時間:2010年
Ab initio calculations suggest that the C-terminus of an α-helix can serve as a novel relay element for long-range charge migration in proteins, as an addition or alternative to the known relay properties of aromatic and S-containing amino acids. The relay ability of an α-helical C-terminus varies with helix length, capping, proximal group competition, and helix twisting/bending. The vertical ionization potential (IPV) is a suitable indicator of hole relay ability and correlates positively with the HOMO energies and inversely with helix length and dipole moment. Different capping groups can yield different effects on the IPV but hardly change the IPV?helix length dependence. A series of recent experimental observations regarding charge migrations by hopping along helices or across different helices and the distance dependence of the charge-transfer rates through helices could be viewed as strong evidence for this prediction that also provides the impetus for further experimental tests and continued theoretical exploration
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