Enhanced extracellular invertase production in Bacillus subtilis by boosting synthesis and secretion in a suitable chassis cell
This study reports the first successful expression of the raffinose-hydrolyzing enzyme InvDz13 in *Bacillus subtilis*, achieving a record-high extracellular activity of 568.86 U/mL through a multidimensional combinatorial strategy involving chassis engineering, promoter optimization, signal peptide screening, and secretion pathway regulation.