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BioID screen of Salmonella type 3 secreted effectors reveals host factors involved in vacuole positioning and stability during infection

Abstract

Many bacterial pathogens express virulence proteins that are translocated into host cells (herein referred to as effectors), where they can interact with target proteins to manipulate host cell processes. These effector–host protein interactions are often dynamic and transient in nature, making them difficult to identify using traditional interaction-based methods. Here, we performed a systematic comparison between proximity-dependent biotin labelling (BioID) and immunoprecipitation coupled with mass spectrometry to investigate a series of Salmonella type 3 secreted effectors that manipulate host intracellular trafficking (SifA, PipB2, SseF, SseG and SopD2). Using BioID, we identified 632 candidate interactions with 381 unique human proteins, collectively enriched for roles in vesicular trafficking, cytoskeleton components and transport activities. From the subset of proteins exclusively identified by BioID, we report that SifA interacts with BLOC-2, a protein complex that regulates dynein motor activity. We demonstrate that the BLOC-2 complex is necessary for SifA-mediated positioning of Salmonella-containing vacuoles, and affects stability of the vacuoles during infection. Our study provides insight into the coordinated activities of Salmonella type 3 secreted effectors and demonstrates the utility of BioID as a powerful, complementary tool to characterize effector–host protein interactions.

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Fig. 1: BioID, a proximity-based strategy to identify the host targets of Salmonella type 3 secreted effectors.
Fig. 2: The BLOC-2 complex, a candidate target of the effector SifA.
Fig. 3: The BLOC-2 complex interacts with SifA and is involved with SifA-mediated trafficking.
Fig. 4: SifA targets BLOC-2-dependent trafficking in epithelial cells.
Fig. 5: SifA targets BLOC-2 function in Salmonella-infected epithelial cells.

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Data availability

The data that support the findings of this study are available from the corresponding authors upon request.

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Acknowledgements

J.H.B. holds the Pitblado Chair in Cell Biology. Infrastructure for the Brumell Laboratory was provided by a John Evans Leadership Fund grant from the Canadian Foundation for Innovation and the Ontario Innovation Trust. V.M.D. was supported by fellowships from the Canadian Institutes of Health Research and the Hospital for Sick Children Research Training Centre, and is a recipient of the L’Oreal-UNESCO Women in Science Award. K.C.B. was supported by scholarships from the Natural Sciences and Engineering Research Council of Canada and the Ontario Graduate Scholarship. We thank Paul Paroutis for help with confocal microscopy. This work was supported by operating grants from the Canadian Institutes of Health Research (grant no. FDN#154329 to J.H.B., grant no. FDN#143202 to S.G. and grant no. MOP#119289 to B.R.). B.R. holds a Canada Research Chair in Proteomics and Molecular Medicine.

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Authors

Contributions

V.M.D., J.H.B., E.C. and B.R. designed the experiments. V.M.D. and K.C.B. generated the BioID constructs, and V.M.D. generated all other clones and gene mutants. V.M.D. created cell lines and performed experiments for BioID analysis. E.C., E.M.N.L. and J.S. performed peptide isolation and mass spectrometry, and E.C., V.M.D. and K.C.B. analysed subsequent datasets. Downstream cell biological experiments were performed by V.M.D. and T.L. S.G. contributed reagents and technical expertise.

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Correspondence to Vanessa M. D’Costa or John H. Brumell.

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Supplementary information

Supplementary Information

Supplementary Figs. 1–11, original source images, Supplementary Table legends and Supplementary References.

Reporting Summary

Supplementary Table 1

IP–MS profiling of S. Typhimurium effectors.

Supplementary Table 2

BioID profiling of S. Typhimurium effectors.

Supplementary Table 3

BioID and IP–MS datasets enrichment analysis.

Supplementary Table 4

BioID and IP–MS individual baits individual and comparative enrichment analysis.

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D’Costa, V.M., Coyaud, E., Boddy, K.C. et al. BioID screen of Salmonella type 3 secreted effectors reveals host factors involved in vacuole positioning and stability during infection. Nat Microbiol 4, 2511–2522 (2019). https://doi.org/10.1038/s41564-019-0580-9

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