Intrinsic amino acid size parameters from a series of 113 lysine-terminated tryptic digest peptide ions

Article Abstract:

A study was conducted to analyze cross sections of mixtures of tryptic digest peptide ions established by electrospray ionization using a novel ion mobility/time-of-flight spectrometry method. The peptide mixtures were electrosprayed into the gas phase. The cross sections were found to be dependent on the amino acid structure of each peptide. The reduced cross sections correlated with the fractions of nonpolar or polar aliphatic residues.

Research, Peptides, Ions, Ionization, Time-of-flight mass spectrometry

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Evidence for many resolvable structures within conformation types of electrosprayed ubiquitin ions

Article Abstract:

Ubiquitin ions in the gas phase were examined by a new two-dimensional ion mobility spectrometry approach combined with mass spectrometry. The results reveal that the narrow range of structures that is selected is retained through the second separation, requiring that these ions do not interconvert significantly within the broader range of conformations associated with the structural type.

Spectra, Ubiquitin, Structure

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Compact - extended helix transitions of polyalanine in vacuo

Article Abstract:

Ion mobility/time-of-flight mass spectrometry techniques are used to examine structural transitions as a function of temperature for a series of [Ala(sub n) + 3H](super 3+) (n=27-39) ions. Possible mechanisms for the compact --> extended helix transition are considered.

Alanine, Transition temperature, Chemical properties, Phase transition temperatures

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