期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 135, 期 8, 页码 3186-3192出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja3114505
关键词
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资金
- NIH [RC1GM090797-02]
- Indiana University METAcyte initiative
- Lilly Endowment
- Robert A. Welch Foundation [A-1176]
A recent ion mobility-mass spectrometry (IM-MS) study of the nonapeptide bradykinin (BK, amino acid sequence Arg(1)-Pro(2)-Pro(3)-Gly(4)-Phe(5)-Ser(6)-Pro(7)-Phe(8)-Arg(9)) found evidence for 10 populations of conformations that depend upon the solution composition [J. Ant. Chetn. Soc. 2011, 133, 13810]. Here, the role of the three proline residues (Pro(2), Pro(3), and Pro(7)) in establishing these conformations is investigated using a series of seven analogue peptides in which combinations of alanine residues are substituted for prolines. IM-MS distributions of the analogue peptides, when compared to the distribution for BK, indicate the multiple structures are associated with different combinations of cis and trans forms of the three proline residues. These data are used to assign the structures to different peptide populations that are observed under various solution conditions. The assignments also show the connectivity between structures when collisional activation is used to convert one state into another.
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