0 -> AcCoA AcCoA -> 0 HOAc -> HOAc_E HOAc_E -> HOAc AcCoA -> AcP AcP -> OAc OAc -> AcP OAc -> AcCoA OAc -> HOAc HOAc -> OAc 0 -> LacI 0 -> Acs 0 -> Pta LacI -> 0 Acs -> 0 Pta -> 0