Corynebacterium glutamicumにおける効率的な細胞内生産物回収のためのデュアル入力グルコース・温度感受性分解回路の工学的設計

Corynebacterium glutamicum is a versatile microbial cell factory, but efficient recovery of intracellular macromolecules remains a major challenge. In this study, we engineered environmentally controllable lysis systems to enable programmable product release. A glucose-responsive module, combining the cg3195 promoter with phage-derived holin-endolysin genes (clg51-50), triggered lysis when extracellular glucose dropped below 0.19-0.36 g/L. A separate temperature-inducible system employing the cI857-CJ1OX2 module activated lysis at 42 °C. These modules were further integrated into a dual-input AND-gate circuit, enhancing regulatory precision and suppressing premature lysis, with additional operator copies allowing temporal tuning of induction. Functional validation using fluorescence, cell density measurements, and scanning electron microscopy confirmed robust, tunable responses under defined environmental cues. Collectively, these programmable lysis systems demonstrate that stimulus-responsive genetic circuits can be rationally designed to control cell disruption, providing a promising approach to streamline downstream processing and reduce extraction costs in industrial fermentation of Corynebacterium glutamicum.