Abstract
Strategies to control the levels of key enzymes of bacterial metabolism are commonly based on the manipulation of gene of interest within the target pathway. The development of new protocols towards the manipulation of biochemical processes is still a major challenge in the field of metabolic engineering. On this background, the FENIX (functional engineering of SsrA/NIa-based flux control) system allows for the post-translational regulation of protein levels, providing both independent control of the steady-state protein amounts and inducible accumulation of target proteins. This strategy enables an extra layer of control over metabolic fluxes in bacterial cell factories (see Graphical abstract below). The protocol detailed here describes the steps needed to design FENIX-tagged proteins and to adapt the system to virtually any pathway for fine-tuning of metabolic fluxes. Graphical abstract.
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