Abstract: A method for producing a secreted recombinant polypeptide sequence is provided. In some embodiments it comprises providing a recombinant microorganism comprising a recombinant nucleic acid comprising a first nucleic acid sequence encoding the recombinant polypeptide sequence operatively linked to a second nucleic acid sequence encoding a signal peptide; and culturing the recombinant microorganism in a culture medium under conditions sufficient for production and secretion of the recombinant protein by the recombinant microorganism. In some embodiments the coding sequence for the signal peptide is not native to the recombinant microorganism. In some embodiments the recombinant microorganism is photo synthetic. Also provided are recombinant photosynthetic microorganisms, isolated polypeptides comprising a signal peptide comprising an amino acid sequence disclosed herein, and isolated nucleic acids comprising a coding sequence for one of the signal peptides, among other things.

Abstract: Charged nutritive proteins are provided. In some embodiments the nutritive proteins an aqueous solubility of at least 12.5 g/L at pH 7. In some embodiments the nutritive proteins an aqueous solubility of at least 50 g/L at pH 7. In some embodiments the nutritive proteins an aqueous solubility of at least 100 g/L at pH 7.

Abstract: Charged nutritive proteins are provided. In some embodiments the nutritive proteins an aqueous solubility of at least 12.5 g/L at pH 7. In some embodiments the nutritive proteins an aqueous solubility of at least 50 g/L at pH 7. In some embodiments the nutritive proteins an aqueous solubility of at least 100 g/L at pH 7.

Abstract: Charged nutritive proteins are provided. In some embodiments the nutritive proteins an aqueous solubility of at least 12.5 g/L at pH 7. In some embodiments the nutritive proteins an aqueous solubility of at least 50 g/L at pH 7. In some embodiments the nutritive proteins an aqueous solubility of at least 100 g/L at pH 7.

Abstract: Methods of producing an unsaturated free fatty acid comprising at least 18 carbon atoms are provided. In some embodiments, the methods comprise culturing an engineered microorganism in a culture medium, wherein the engineered microorganism comprises at least one recombinant enzyme selected from acyl-lipid desaturase delta-9 (EC:1.14.19.1), acyl-lipid desaturase delta-12 (EC:1.14.19.6), acyl-lipid desaturase delta-15 (EC:1.14.19.-), and thioesterase (EC:3.1.2.14). Engineered microorganisms comprising at least one of those recombinant enzymes are also provided. The methods and organisms can be used to produce at least one free fatty acid selected from oleic acid, linoleic acid and ?-linolenic acid.