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However, there is currently no method to selectively control this biosynthesis process in a subset of microbes within a population using external stimuli. In this study, we have attained precise and selective control over the microbial biosynthesis of QDs through the utilization of an optogenetically engineered <jats:italic>Escherichia coli<\/jats:italic> (<jats:italic>E. coli<\/jats:italic>). The recombinant <jats:italic>E. coli<\/jats:italic> is designed to express smCSE enzyme, under the regulation of eLightOn system, which can be activated by blue light. The smCSE enzymes use L\u2010cysteine and Cd<jats:sup>2+<\/jats:sup> as substrates to form CdS QDs. This system enables light\u2010inducible bacterial biosynthesis of QDs in precise patterns within a hydrogel for information encryption. As the biosynthesis progresses, the optical characteristics of the QDs change, allowing living materials containing the recombinant <jats:italic>E. coli<\/jats:italic> to display time\u2010dependent patterns that self\u2010destruct after reading. Compared to static encryption using fluorescent QD inks, dynamic information encryption based on living materials offers enhanced security.<\/jats:p>","DOI":"10.1002\/anie.202315251","type":"journal-article","created":{"date-parts":[[2023,12,13]],"date-time":"2023-12-13T00:35:15Z","timestamp":1702427715000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Living Materials Based Dynamic Information Encryption via Light\u2010Inducible Bacterial Biosynthesis of Quantum Dots"],"prefix":"10.1002","volume":"63","author":[{"given":"Luqi","family":"Niu","sequence":"first","affiliation":[{"name":"Department of Environmental and Chemical Engineering Shanghai University  Nanchen Rd. 333 Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lin","family":"Yu","sequence":"additional","affiliation":[{"name":"Department of Environmental and Chemical Engineering Shanghai University  Nanchen Rd. 333 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