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Effect of lacY expression on homogeneity of induction from the P_(tac) and P-(trc)promoters bynatural and synthetic inducers

机译:lacY表达对天然和合成诱导剂诱导的P_(tac)和P-(trc)启动子同质性的影响

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摘要

The role of the Escherichia coli lactose permease (LacY) in the homogeneous induction of thelactose-inducible promoters P_(tac) and P_(trc) by the naturalinducer lactose and the synthetic inducer isopropyl-#beta#-D-thiogalactopyranoside (IPTG)was investigated.Lactose requires active transport by LacY,whereas IPTG canfreely penetrate the cell wall.In E.colistrains lacking a functionalLacY.IPTG is required for induction of P_(tac) and P_(trc).In E.coli strains carrying a functional LacY,induction of P_(trc) and P_(tac) with intermediate concentrations of lactose gave rise to two subpopulations,one fully induced and one uninduced,whereas a single,fully incuded population resuted when high inducer concentrations were used.In constrast,induction with IPTG gave rise toa single population of cells at all inducer concentrations in both lacY and lacY~+ strains.
机译:大肠杆菌乳糖通透酶(LacY)在天然诱导剂乳糖和合成诱导剂异丙基-异丙基-β-β-D-硫代吡喃半乳糖苷(IPTG)均诱导乳糖诱导性启动子P_(tac)和P_(trc)的作用乳糖需要通过LacY主动转运,而IPTG可以自由渗透细胞壁。在缺乏功能性LacY的大肠杆菌中,需要IPTG诱导P_(tac)和P_(trc)。在携带功能性LacY的大肠杆菌菌株中因此,用中等浓度的乳糖诱导P_(trc)和P_(tac)会导致两个亚群,一个完全诱导的群体和一个未诱导的群体,而当使用高诱导剂浓度时,单个完全诱导的种群重新形成。 IPTG在lacY和lacY〜+菌株中在所有诱导剂浓度下均产生单个细胞群。

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