期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 114, 期 2, 页码 809-816出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp9105103
关键词
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资金
- National Institutes of Health [1 RO1 RR019587-01]
- Robert A. Welch Foundation [A-1176, 1 T32 GM065088-01A1]
Ion mobility-mass spectrometry is used to investigate the structure(s) of a series of model peptide [M + H](+) ions to better understand how intrinsic properties affect structure in low dielectric environments. The influence of peptide length, amino acid sequence, and composition on gas-phase structure is examined for a series of model peptides that have been previously Studied in Solution. Collision cross sections for the [M + H](+) ions of Ac-(AAKAA)(n)Y-NH2 (n = 3-6) and Ac-Y(AEAAKA)(n)F-NH2 (n = 2-5) are reported and correlated with candidate structures generated using molecular modeling techniques. The [M + H](+) ions of the AAKAA peptide series each exhibit a single, dominant ion mobility arrival time distribution (ATD) which correlates to partial helical structures, whereas the [M + H](+) ions of the AEAAKA ion series are composed of ATDs which correlate to charge-solvated globules (i.e., the charge is coordinated or solvated by polar peptide functional groups). These data raise numerous questions concerning intrinsic properties (amino acid sequence and composition as well as charge location) that dictate gas-phase peptide ion structure, which may reflect trends for peptide ion structure in low dielectric environments, such as transmembrane segments.
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