Efficient Biofilm-Based Fermentation Strategies by eDNA Formation for l-Proline Production with .

Biofilms could provide favorable conditions for the growth of cells during industrial fermentation. However, biofilm-immobilized fermentation has not yet been reported in (), one of the main strains for amino acid production. This is mainly because has a poor capability of adsorption onto materials or forming an extracellular polymeric substance (EPS). Here, an engineered strain, Pro-Δ, was created by removing the extracellular nuclease gene , which effectively increased extracellular DNA (eDNA) in the EPS and cell adhesiveness onto carrier materials. In repeated-batch fermentation using the biofilm, l-proline production increased from 10.2 to 17.1 g/L. In summary, this research demonstrated that a synthetic biofilm could be favorable for l-proline production, which could be extended to other industrial applications of , and the strategy may also be applicable to the engineering of other strains.