Cis-trans isomerizations of proline residues are key to bradykinin conformations.
Cis-trans isomerizations of proline residues are key to bradykinin conformations.
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DOI:
10.1021/ja3114505
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发表时间:
2013-02-27
影响因子:
15
通讯作者:
Clemmer, David E.
中科院分区:
文献类型:
--
作者:
Pierson, Nicholas A.;Chen, Liuxi;Russell, David H.;Clemmer, David E.
A recent ion mobility – mass spectrometry (IM–MS) study of the nonapeptide bradykinin (BK, amino acid sequence Arg1–Pro2–Pro3–Gly4–Phe5–Ser6–Pro7–Phe8–Arg9) found evidence for 10 populations of conformations that depend upon the solution composition [J. Am. Chem. Soc. 2011, 133, 13810]. Here, the role of the three proline residues (Pro2, Pro3, and Pro7) 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 bradykinin, 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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