In order to construct the expression vector phaEC461c, we initially amplified a 2.2-kbp DNA fragment carrying the M. aeruginosa NIES-843 phaEC genes by PCR, in which LA-taq DNA polymerase (Takara, Tokyo, Japan) was used, with the specific primers phaEC_FwIF and phaABEC_RvIF for the phaEC gene.