Synthesizes poly(3-hydroxyalkanoates) (PHA), complements a mutant of P.putida that does not make PHA. Biopolymer metabolism; poly-(R)-3-hydroxybutanoate biosynthesis. P.oleovorans accumulates poly(3-hydroxyalkanoates) after growth on medium chain length hydrocarbons. Large amounts of this polyester are synthesized when cells are grown under nitrogen-limiting conditions. When nitrogen is resupplied in the medium, the accumulated PHA is degraded. Belongs to the PHA/PHB synthase family. Type II PhaC subfamily.