Properties of C. acetobutylicium FabZ and FabF1 in vitro. Panel A. The ability of C. acetobutylicium FabZ to synthesize fatty acids was determined by conformationally-sensitive gel electrophoresis. Lanes: lane 1, no addition; lane 2, E. coli FabA (ecFabA) was added; lane 3, E. coli FabZ (ecFabZ) was added and lane 4, C. acetobutylicium FabZ (caFabZ) was added. Panel B. The reactions shown above the gel were as in lane 2 except that E. coli FabB was replaced with C. acetobutylicium FabF1 (caFabF) in lanes 2–4. Lane 6 is the 3-hydroxydecanoyl-ACP standard as in lane 1 of panel A.