Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) is known for its multifunctionality in several pathogenic bacteria. Our previously reported data suggest that the GAPDH homologue of Francisella tularensis, GapA, might also be involved in other processes beyond metabolism. In the present study, we explored GapA's potential implication in pathogenic processes at the host cell level. Using immunoelectron microscopy, we demonstrated the localization of this bacterial protein inside infected macrophages and its peripheral distribution in bacterial cells increasing with infection time. A quantitative proteomic approach based on stable isotope labeling of amino acids in cell culture (SILAC) combined with pull-down assay enabled the identification of several of GapA's potential interacting partners within the host cell proteome. Two of these partners were further confirmed by alternative methods. We also investigated the impact of gapA deletion on the transcription of selected cytokine genes and the activation of the main signaling pathways. Our results show that ∆gapA-induced transcription of genes encoding several cytokines whose expressions were not affected in cells infected with a fully virulent wild-type strain. That might be caused, at least in part, by the detected differences in ERK/MAPK signaling activation. The experimental observations together demonstrate that the F. tularensis GAPDH homologue is directly implicated in multiple host cellular processes and, thereby, that it participates in several molecular mechanisms of pathogenesis.

Department of Biochemical Sciences Faculty of Pharmacy in Hradec Kralove Charles University Prague Akademika Heyrovskeho 1203 500 05 Hradec Kralove Czech Republic

Department of Molecular Pathology and Biology Faculty of Military Health Sciences University of Defence Trebesska 1575 500 01 Hradec Kralove Czech Republic

Institute of Molecular Genetics of the Czech Academy of Sciences Department of Biology of the Cell Nucleus Videnska 1083 142 20 Prague Czech Republic

Institute of Molecular Genetics of the Czech Academy of Sciences Electron Microscopy Core Facility Videnska 1083 142 20 Prague Czech Republic

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