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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Generation of[La(peptide)]~(3+)Complexes in the Gas Phase:Determination of the Number of Binding Sites Provided by Dipeptide,Tripeptide,and Tetrapeptide Ligands
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Generation of[La(peptide)]~(3+)Complexes in the Gas Phase:Determination of the Number of Binding Sites Provided by Dipeptide,Tripeptide,and Tetrapeptide Ligands

机译：气相中[La（肽）]〜（3+）配合物的产生：确定二肽，三肽和四肽配体提供的结合位点数

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摘要

Gas-phase complexes[La(peptide)]~(3+)containing 2-4 amino-acid residues have been investigated by electrospraying solutions containing La~(3+)and the peptide;only complexes in which the peptide contained an arginine residue were observed.Using the coordination number of eight for La~(3+)[Shi,T.;Hopkinson,A.C;Siu,K.W.M.Chem.Eur.J.2007,73,1142-1151]and the relative abundances of the hydrates[La(peptide)-(H2O)_n]~(3+),the number of binding sites provided by the peptides was deduced:Leu-Trp-Met-Arg,7;Met-Arg-Phe-Ala,6;Gly-Arg-Gly,4;Gly-Gly-Arg 4;and Met-Arg,4.Density Functional Theory calculations show that the zwitterionic form of Gly-Gly-Arg preferentially binds La~(3+)through four coordination sites-the two amide oxygens and the two carboxy oxygens.
机译：通过电喷雾含有La〜（3+）和该肽的溶液，研究了含有2-4个氨基酸残基的气相复合物[La（肽）]〜（3+）;仅该肽中含有精氨酸残基的复合物使用La〜（3+）的配位数为8 [Shi，T。; Hopkinson，AC; Siu，KWMChem.Eur.J.2007,73,1142-1151]和水合物的相对丰度[La（peptide）-（H2O）_n]〜（3+），推导了肽提供的结合位点数：Leu-Trp-Met-Arg，7; Met-Arg-Phe-Ala，6; Gly -Arg-Gly，4; Gly-Gly-Arg 4;和Met-Arg，4。密度泛函理论计算表明，两性离子形式的Gly-Gly-Arg优先通过四个配位点结合La〜（3+）。两个酰胺氧和两个羧基氧

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