Poly-3-hydroxybutyrate Synthase from the Periplasm of Escherichiacoli

This is the first report of a poly-3-hydroxybutyrate (PHB) synthase in Escherichiacoli. The enzyme was isolated from the periplasm using ammonium sulfate fractionation, hydrophobic, and size-exclusion chromatography and identified by LC/MS/MS as YdcS, a component of a putative ABC transporter. Green Fluorescent Protein-tagged ydcS, purified by 2D native gel electrophoresis, also exhibited PHB synthase activity. Optimal conditions for enzyme activity were 37 °C, pH 6.8–7.5, 100 mM KCl. Km was 0.14 mM and Vmax was 18.7 nmol/mg protein/min. The periplasms of deletion mutants displayed <25% of the activity of the parent strain. Deletion mutants exhibited ∼25% less growth in M9 medium, glucose, and contained ∼30% less PHB complexed to proteins (cPHB) in the outer membranes, but the same concentration of chloroform-extractable PHB as wild-type cells. The primary sequence of YdcS suggests it may belong to the α-/β-hydrolase superfamily which includes polyhydroxybutyrate (PHB) synthases, lipases, and esterases.