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Additionally, this bacterium can be genetically engineered to deliver therapeutic proteins intratumourally. The main limitation of this approach is the efficient release of therapeutic molecules from intratumoural bacteria. Here we have developed an inducible autolysis system based in the lysis operon of the lambda phage that, in response to anhydrotetracycline, lysates Salmonella thus releasing its content. The system was combined with a salicylate cascade system that allows efficient production of therapeutic molecules in response to aspirin and with a\n                    <jats:italic>sifA<\/jats:italic>\n                    mutation that liberates bacteria from the vacuoles to a cytosolic location. The combination of these three elements makes this strain a putative powerful instrument in cancer treatment. We have used this engineered strain for the intracellular production and delivery of Cp53 peptide. The engineered strain is able to sequentially produce and release the cytotoxic peptide while proliferating inside tumour cells, thus inducing host cell death. Our results show that temporal separation of protein production from protein release is essential to efficiently kill tumour cells. The combined system is a further step in the engineering of more efficient bacteria for cancer therapy.\n                  <\/jats:p>","DOI":"10.1038\/srep30591","type":"journal-article","created":{"date-parts":[[2016,7,28]],"date-time":"2016-07-28T08:07:10Z","timestamp":1469693230000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":76,"title":["Engineering Salmonella as intracellular factory for effective killing of tumour cells"],"prefix":"10.1038","volume":"6","author":[{"given":"Eva Mar\u00eda","family":"Camacho","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Beatriz","family":"Mesa-Pereira","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carlos","family":"Medina","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amando","family":"Flores","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eduardo","family":"Santero","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2016,7,28]]},"reference":[{"key":"BFsrep30591_CR1","doi-asserted-by":"publisher","first-page":"94","DOI":"10.1016\/j.copbio.2015.05.004","volume":"35","author":"C Pinero-Lambea","year":"2015","unstructured":"Pinero-Lambea, C., Ruano-Gallego, D. & Fernandez, L. 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