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Mixed-Isotope Labeling with LC-IMS-MS for Characterization of Protein–Protein Interactions by Chemical Cross-Linking

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Journal of The American Society for Mass Spectrometry

Abstract

Chemical cross-linking of proteins followed by proteolysis and mass spectrometric analysis of the resulting cross-linked peptides provides powerful insight into the quaternary structure of protein complexes. Mixed-isotope cross-linking (a method for distinguishing intermolecular cross-links) was coupled with liquid chromatography, ion mobility spectrometry and mass spectrometry (LC-IMS-MS) to provide an additional separation dimension to the traditional cross-linking approach. This method produced multiplet m/z peaks that are aligned in the IMS drift time dimension and serve as signatures of intermolecular cross-linked peptides. We developed an informatics tool to use the amino acid sequence information inherent in the multiplet spacing for accurate identification of the cross-linked peptides. Because of the separation of cross-linked and non-cross-linked peptides in drift time, our LC-IMS-MS approach was able to confidently detect more intermolecular cross-linked peptides than LC-MS alone.

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Acknowledgments

The authors thank Dr. Gaetano Montelione and the NESG for providing the plasmid construct for expressing SrfN/STM0082 and the mixture of unlabeled and 13C,15N-labeled SO_2176, Dr. Sam Payne and Dr. Gordon Slysz for helpful discussions, and Dr. Abdullah Kahraman for assistance with the Xwalk program. This research was supported by the National Institute of General Medical Sciences (NIGMS grant GM094623). SrfN protein was produced in a project funded by the National Institute of Allergy and Infectious Diseases (IAA Y1-AI-8401-01). The work used instrumentation and capabilities developed with support from the NIGMS grant 8 P41 GM103493-10, and the US Department of Energy/Office of Biological and Environmental Research (DOE/BER). This work was performed in EMSL, a DOE/BER National Scientific User Facility located at PNNL in Richland, Washington.

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Correspondence to Joshua N. Adkins.

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Merkley, E.D., Baker, E.S., Crowell, K.L. et al. Mixed-Isotope Labeling with LC-IMS-MS for Characterization of Protein–Protein Interactions by Chemical Cross-Linking. J. Am. Soc. Mass Spectrom. 24, 444–449 (2013). https://doi.org/10.1007/s13361-012-0565-x

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