Carotenoid production in Bacillus subtilis achieved by metabolic engineering

The carotenoid synthetic genes, crtM and crtN, derived from Staphylococcus aureus, were introduced into B. subtilis, resulting in yellow pigmentation. Absorption maxima of pigments and MALDI-TOF mass spectrometry demonstrated that the pigmented strain accumulated two C30 carotenoids, 4,4′-diapolycopene and 4,4′-diaponeurosporene. A survival test using H2O2 revealed that the pigmented strain was more resistant to oxidative stress than the strain harboring an empty-vector. These findings indicate that B.subtilis can produce carotenoids, and the strain accumulating the carotenoids, CarotenoBacillus, will become a basal host for production of C30 carotenoids and evaluation of their antioxidative effects.