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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

IRMPD and ECD fragmentation of intermolecular cross-linked peptides

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Author(s):
Arruda Santos, Luiz Fernando [1] ; Eberlin, Marcos Nogueira [2] ; Gozzo, Fabio Cesar [3]
Total Authors: 3
Affiliation:
[1] Univ Estadual Campinas. Inst Chem
[2] Univ Estadual Campinas. Inst Chem
[3] Univ Estadual Campinas. Inst Chem
Total Affiliations: 3
Document type: Journal article
Source: Journal of Mass Spectrometry; v. 46, n. 3, p. 262-268, MAR 2011.
Web of Science Citations: 5
Abstract

Despite the increasing number of studies using mass spectrometry for three dimensional analyses of proteins (MS3D), the identification of cross-linked peptides remains a bottleneck of the method. One of the main reasons for this is the lack of knowledge about the fragmentation of these species. Intermolecular cross-linked peptides are considered the most informative species present in MS3D experiment, since different peptides are connected by a cross-linker, the peptides chain can be either from a single protein, providing information about protein folding, or from two different proteins in a complex, providing information about binding partners, complex topology and interaction sites. These species tend to be large and highly charged in ESI, making comprehensive fragmentation by CID MS/MS problematic. On the other hand, these highly charged peptides are very suitable for dissociation using both infrared multiphoton dissociation (IRMPD) and electron capture dissociation (ECD). Herein, we report the fragmentation study of intermolecular cross-linked peptides using IRMPD and ECD. Using synthetic peptides and different commercial cross-linkers, a series of intermolecular cross-linked peptides were generate, and subsequently fragmented by IRMPD and ECD in a FT-ICR-MS instrument. Due to the high mass accuracy and resolution of the FT-ICR, the fragment ions could be attributed with high confidence. The peptides sequence coverage and fragmentation features obtained from IRMPD and ECD were compared for all charge states. Copyright (C) 2011 John Wiley \& Sons, Ltd. (AU)

FAPESP's process: 08/57805-2 - Institute of Bioanalytics
Grantee:Lauro Tatsuo Kubota
Support Opportunities: Research Projects - Thematic Grants