| abstract |
One embodiment of the invention provides a metabolically enhanced photoautotrophic, ethanol producing host cell comprising: at least two first metabolic enhancements reducing the enzymatic activity or affinity of at least two endogenous host cell enzymes involved in acetate and lactate fermentation, the first metabolic enhancements resulting in an enhanced level of biosynthesis of acetaldehyde, pyruvate, acetyl-CoA or precursors thereof compared to the respective wild type host cell, at least one second metabolic enhancement different from the first metabolic enhancement comprising an overexpressed enzyme for the formation of ethanol. |