A bacterial type III secretion-based protein delivery tool for broad applications in cell biology

Simon J Ittig, Christoph Schmutz, Christoph A Kasper, Marlise Amstutz, Alexander Schmidt, Loïc Sauteur, M Alessandra Vigano, Shyan Huey Low, Markus Affolter, Guy R Cornelis, Erich A Nigg, Cécile Arrieumerlou

Research output: Contribution to journalArticlepeer-review


Methods enabling the delivery of proteins into eukaryotic cells are essential to address protein functions. Here we propose broad applications to cell biology for a protein delivery tool based on bacterial type III secretion (T3S). We show that bacterial, viral, and human proteins, fused to the N-terminal fragment of the Yersinia enterocolitica T3S substrate YopE, are effectively delivered into target cells in a fast and controllable manner via the injectisome of extracellular bacteria. This method enables functional interaction studies by the simultaneous injection of multiple proteins and allows the targeting of proteins to different subcellular locations by use of nanobody-fusion proteins. After delivery, proteins can be freed from the YopE fragment by a T3S-translocated viral protease or fusion to ubiquitin and cleavage by endogenous ubiquitin proteases. Finally, we show that this delivery tool is suitable to inject proteins in living animals and combine it with phosphoproteomics to characterize the systems-level impact of proapoptotic human truncated BID on the cellular network.
Original languageEnglish
Pages (from-to)913-931
Number of pages19
JournalJournal of Cell Biology
Issue number4
Publication statusPublished - 2015

Fingerprint Dive into the research topics of 'A bacterial type III secretion-based protein delivery tool for broad applications in cell biology'. Together they form a unique fingerprint.

Cite this