Method of producing polyhydroxyalkanoate copolymer mixture and transformed microorganism

A transformed microorganism that produces a polyhydroxyalkanoate copolymer mixture, the transformed microorganism comprising a gene encoding two types of polyhydroxyalkanoate synthases differing in polymerization activity for 3-hydroxyhexanoyl-CoA, wherein

• the transformed microorganism has been transformed to supply a greater amount of 3-hydroxyhexanoyl-CoA to an intracellular polyhydroxyalkanoate synthase than a wild strain of the transformed microorganism,
• the polyhydroxyalkanoate copolymer mixture comprises:
• a polyhydroxyalkanoate fraction (I) comprising a polyhydroxyalkanoate copolymer having a 3-hydroxybutyrate structural unit and a 3-hydroxyhexanoate structural unit, the polyhydroxyalkanoate fraction (I) having an average 3-hydroxyhexanoate unit ratio of 20 mol % or more;
• and
• a polyhydroxyalkanoate fraction (II) comprising a polyhydroxyalkanoate having a 3-hydroxybutyrate structural unit, the polyhydroxyalkanoate fraction (II) having an average 3-hydroxyhexanoate unit ratio of 0 to 15 mol %, and
• the polyhydroxyalkanoate copolymer mixture has an average 3-hydroxyhexanoate unit ratio of 22 mol % or less.