Abstract: There is provided a microbial cell which is capable of producing at least one higher alcohol, wherein the microbial cell is genetically modified to include an increased expression relative to its wild type cell of at least one acyl-CoA reductase (E11). In particular, there is provided a microbial cell capable of producing at least one higher alcohol, wherein the microbial cell is genetically modified to include an increased expression relative to its wild type cell of at least one acyl-CoA reductase (E11) and wherein the cell is capable of producing a carboxylic acid and/or ester thereof using ethanol-carboxylate fermentation.

Abstract: The present invention provides a microbial cell capable of producing at least one terminal alkene from at least one short chain fatty acid, wherein the cell is genetically modified to comprise at least a first genetic mutation that increases the expression relative to the wild type cell of an enzyme (E1) selected from the CYP152 peroxygenase family, and at least a second genetic mutation that increases the expression relative to the wild type cell of at least one NAD(P)+ oxidoreductase (E2) and the corresponding mediator protein, wherein the short chain fatty acid is a C4-C10 fatty acid.

Abstract: The present invention provides a microbial cell capable of producing at least one terminal alkene from at least one short chain fatty acid, wherein the cell is genetically modified to comprise at least a first genetic mutation that increases the expression relative to the wild type cell of an enzyme (E1) selected from the CYP152 peroxygenase family, and at least a second genetic mutation that increases the expression relative to the wild type cell of at least one NAD(P)+ oxidoreductase (E2) and the corresponding mediator protein, wherein the short chain fatty acid is a C4-C10 fatty acid.