The interferon signalling system elicits a robust cytokine response against a wide range of environmental pathogenic and internal pathological signals, leading to induction of a subset of interferon-induced proteins. We applied DSS (disuccinimidyl suberate) mediated cross-linking mass spectrometry (CLMS) to capture novel protein-protein interactions within the realm of interferon induced proteins. In addition to the expected interferon-induced proteins, we identified novel inter- and intra-molecular cross-linked adducts for the canonical interferon induced proteins, such as MX1, USP18, OAS3, and STAT1. We focused on orthogonal validation of a cohort of novel interferon-induced protein networks formed by the HLA-A protein (H2BFS-HLA-A-HMGA1) using co-immunoprecipitation assay, and further investigated them by molecular dynamics simulation. Conformational dynamics of the simulated protein complexes revealed several interaction sites that mirrored the interactions identified in the CLMS findings. Together, we showcase a proof-of-principle CLMS study to identify novel interferon-induced signaling complexes and anticipate broader use of CLMS to identify novel protein interaction dynamics within the tumour microenvironment.

Department of Experimental Biology Faculty of Science Masaryk University Kamenice 5 625 00 Brno Czech Republic

Institute of Genetics and Cancer University of Edinburgh Edinburgh EH4 2XR Scotland UK

International Centre for Cancer Vaccine Science University of Gdansk ul Kładki 24 80 822 Gdansk Poland

RECAMO Masaryk Memorial Cancer Institute Zlutykopec 7 65653 Brno Czech Republic

School of Biological Sciences Institute of Structural and Molecular Biology University of Edinburgh Edinburgh EH9 3JR UK

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