Abstract
Host–pathogen protein–protein interactions are highly complex and dynamic and mediate key steps in pathogen adhesion to host, host invasion, and colonization as well as immune evasion. In bacteria, these interactions most often involve specialized virulence factors or effector proteins that specifically target central host proteins. Here, I present a mass spectrometry-based proteomics approach starting with the identification of host–pathogen interactions by affinity-purification followed by mapping the specific host–pathogen protein–protein interaction interfaces by crosslinking mass spectrometry and structural modeling of the complexes.
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Acknowledgments
Support from the Swedish National Infrastructure for Biological Mass Spectrometry (BioMS) and the SciLifeLab, Integrated Structural Biology platform (ISB), is gratefully acknowledged. The cloning, expression, and purification of ISP and GFP were performed at the Lund Protein Production Platform, Lund University, Sweden (http://www.lu.se/lp3). This work was supported by the Crafoord Foundation, the Royal Physiographic Society of Lund, Stiftelsen Clas Groschinskys Minnesfond, Åke Wibergs Stiftelse, and Alfred Österlunds Stiftelse. Emil Tykesson is acknowledged for generating the AlphaFold model of ISP, and Simon Ekström and Esko Oksanen for critically reviewing this chapter.
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Happonen, L.J. (2023). Affinity-Purification Combined with Crosslinking Mass Spectrometry for Identification and Structural Modeling of Host–Pathogen Protein–Protein Complexes. In: Nordenfelt, P., Collin, M. (eds) Bacterial Pathogenesis. Methods in Molecular Biology, vol 2674. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-3243-7_12
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DOI: https://doi.org/10.1007/978-1-0716-3243-7_12
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