Young I G, Langman L, Luke R K, Gibson F
J Bacteriol. 1971 Apr;106(1):51-7. doi: 10.1128/jb.106.1.51-57.1971.
Mutants of Escherichia coli K-12 blocked in each of the three enzymatic reactions between chorismate and 2,3-dihydroxybenzoate, in the pathway leading to the iron-sequestering compound enterochelin, have been isolated and biochemically characterized. The three genes concerned (designated entA, entB and entC) have been shown to be clustered on the chromosome between purE and gal and to be located near minute 14 by cotransduction with the purE, lip, and fep genes. entA, entB, and entC were shown to be the structural genes for 2,3-dihydro-2,3-dihydroxybenzoate dehydrogenase, 2,3-dihydro-2,3-dihydroxybenzoate synthetase, and isochorismate synthetase, respectively.
已分离出大肠杆菌K-12的突变体,这些突变体在分支酸与2,3-二羟基苯甲酸之间的三种酶促反应中均被阻断,这三种酶促反应位于通向铁螯合化合物肠螯合素的途径中,并对其进行了生化特性分析。已证明相关的三个基因(命名为entA、entB和entC)在染色体上位于purE和gal之间成簇排列,并通过与purE、lip和fep基因的共转导定位在约14分钟处。结果表明,entA、entB和entC分别是2,3-二氢-2,3-二羟基苯甲酸脱氢酶、2,3-二氢-2,3-二羟基苯甲酸合成酶和异分支酸合成酶的结构基因。