Vmax X2 is a novel, fast-growing bacterial strain designed and optimized for high-level recombinant protein expression. Vmax cells are derived from the fast-growing, gram-negative, non-pathogenic marine bacterium, Vibrio natriegens. With a doubling time twice that of E. coli and the ability to generate greater amounts of biomass per volume of cells, Vmax™ X2 results in larger amounts of soluble protein faster.