Partial amino acid sequence alignment of the PHA synthase from Chromobacterium sp. strain USM2 (PhaCCs) with those from R. eutropha (PhaCRe), A. caviae (PhaCAc), Pseudomonas sp. strain 61-3 (PhaC1Ps), P. aeruginosa (PhaC1Pa), and P. oleovorans (PhaC1Po). Classes I and II indicate the classification of PHA synthases. Putative active-site residues, aspartic acid (D) and histidine (H), are shaded in gray. The asterisks mark highly conserved amino acid residues, which are present in all PHA synthases. Amino acid residues corresponding to A479 in PhaCCs are boxed.