Figure 5.
Overview of metabolic changes in C. thermocellum ΔhydGΔech . When hydrogenases were inactivated (red X), flux to ethanol increased. Further, the alcohol dehydrogenase mutated, allowing use of NADPH as a cofactor for ethanol production (red pathway). Simultaneously, fluxes to H2, lactate, and acetate decreased or were eliminated (gray pathways).