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TOL 质粒 xylS 基因的分子克隆:xylS 对 xylDEGF 操纵子正向调控的证据

Molecular cloning of gene xylS of the TOL plasmid: evidence for positive regulation of the xylDEGF operon by xylS.

作者信息

Inouye S, Nakazawa A, Nakazawa T

出版信息

J Bacteriol. 1981 Nov;148(2):413-8. doi: 10.1128/jb.148.2.413-418.1981.

Abstract

The xylDEGF operon and the regulatory gene xylS of the TOL plasmid found in Pseudomonas putida mt-2 were cloned onto Escherichia coli vector plasmids. A 9.5-kilobase fragment, derived from the TOL segment of pTN2 deoxyribonucleic acid, carried the xyl genes D, E, G, and F, which encode toluate oxygenase, catechol 2,3-oxygenase, 2-hydroxymuconic semialdehyde dehydrogenase, and 2-hydroxymuconic semialdehyde hydrolase, respectively. The enzymes were noninducible unless a 3-kilobase PstI fragment, derived also from the TOL segment, was provided in either cis or trans. The PstI fragment appeared to contain the regulatory gene xylS, which produced a positive regulator. The regulator was activated by m-toluate or benzoate, but not by m-xylene or m-methylbenzyl alcohol. the map positions of xylG and xylF were also determined.

摘要

恶臭假单胞菌mt-2中发现的TOL质粒的xylDEGF操纵子和调控基因xylS被克隆到大肠杆菌载体质粒上。一个源自pTN2脱氧核糖核酸TOL片段的9.5千碱基片段携带了xyl基因D、E、G和F,它们分别编码甲苯酸加氧酶、儿茶酚2,3-加氧酶、2-羟基粘康酸半醛脱氢酶和2-羟基粘康酸半醛水解酶。这些酶是不可诱导的,除非同样源自TOL片段的一个3千碱基的PstI片段以顺式或反式提供。PstI片段似乎包含调控基因xylS,它产生一种正调控因子。该调控因子被间甲苯酸或苯甲酸激活,但不被间二甲苯或间甲基苄醇激活。还确定了xylG和xylF的图谱位置。

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