The invention concerns a genetically modified microorganism expressing a functional type I or II RuBisCO enzyme and a functional phosphoribulokinase (PRK), and in which the glycolysis pathway is at least partially inhibited, said microorganism being genetically modified so as to produce an exogenous molecule and/or to overproduce an endogenous molecule. According to the invention, the oxidative branch of the pentose phosphate pathway may also be at least partially inhibited. The invention also concerns the use of such a genetically modified microorganism for the production or overproduction of a molecule of interest and processes for the synthesis or bioconversion of molecules of interest.

A microorganism which is genetically modified so that it produces a first essential biomass precursor by metabolizing CO.sub.2 using a recombinant carbon fixation enzyme is disclosed. The microorganism produces a second biomass precursor by metabolizing an organic carbon source and not by metabolizing CO.sub.2. The microorganism does not use the organic carbon source for producing the first essential biomass precursor.

A microorganism which is genetically modified so that it produces a first essential biomass precursor by metabolizing CO.sub.2 using a recombinant carbon fixation enzyme is disclosed. The microorganism produces a second biomass precursor by metabolizing an organic carbon source and not by metabolizing CO.sub.2. The microorganism does not use the organic carbon source for producing the first essential biomass precursor.

Genetically engineered cells and methods are presented that allow for the production of various value products from CO.sub.2. Contemplated cells have a CBB cycle that is genetically modified such that two molecules of CO.sub.2 fixed in the CBB cycle can be withdrawn from the modified CBB cycle as a single C2 compound. In contemplated aspects a CBB cycle includes an enzymatic activity that generates the single C2 compound from a compound of the CBB cycle, while further modifications to the CBB cycle will not introduce additional recombinant enzymatic activity/activities outside the already existing catalytic activities in the CBB cycle.

The invention relates to a recombinant yeast cell, in particular a transgenic yeast cell, functionally expressing one or more recombinant, in particular heterologous, nucleic acid sequences encoding ribulose-1,5-biphosphate carboxylase oxygenase (Rubisco) and phosphoribulokinase (PRK). The invention further relates to the use of carbon dioxide as an electron acceptor in a recombinant chemotrophic micro-organism, in particular a eukaryotic micro-organism.

The invention relates to a recombinant yeast cell, in particular a transgenic yeast cell, functionally expressing one or more recombinant, in particular heterologous, nucleic acid sequences encoding ribulose-1,5-biphosphate carboxylase oxygenase (Rubisco) and phosphoribulokinase (PRK). The invention further relates to the use of carbon dioxide as an electron acceptor in a recombinant chemotrophic micro-organism, in particular a eukaryotic micro-organism.

The invention relates to yeast cells modified to express a functional type I RuBisCO enzyme, and a class II phosphoribulokinase. The expression of these enzymes recreates a Calvin cycle in said yeasts in order to enable the yeasts to use carbon dioxide.

Genetically engineered cells and methods are presented that allow for the production of various value products from CO.sub.2. Contemplated cells have a CBB cycle that is genetically modified such that two molecules of CO.sub.2 fixed in the CBB cycle can be withdrawn from the modified CBB cycle as a single C2 compound. In contemplated aspects a CBB cycle includes an enzymatic activity that generates the single C2 compound from a compound of the CBB cycle, while further modifications to the CBB cycle will not introduce additional recombinant enzymatic activity/activities outside the already existing catalytic activities in the CBB cycle.

A process for the production of ethanol. comprising: fermentation of a feed. under anaerobic conditions. wherein the feed contains a di-saccharide. oligo-saccharide and/or poly-saccharide and wherein the fermentation is carried out in the presence of a recombinant yeast cell. which recombinant yeast produces a combination of proteins having glucosidase activity: and recovery of ethanol. and a recombinant yeast cell for use therein.

A microorganism which is genetically modified so that it produces a first essential biomass precursor by metabolizing CO.sub.2 using a recombinant carbon fixation enzyme is disclosed. The microorganism produces a second biomass precursor by metabolizing an organic carbon source and not by metabolizing CO.sub.2. The microorganism does not use the organic carbon source for producing the first essential biomass precursor.