“…Commercial investment in "brewed materials" and "engineered living materials" underscores the high current interest in engineered protein biomaterials. [1,4,60] Whilst the last decade has seen progress in expressing silk proteins, [10,11,29,38,61] modifying their sequences, [32,62,63] and developing biomimetic processing workflows, [31,47] the notion that microbes could autonomously synthesize, secrete, and process protein materials has not been widely discussed.…”