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An msbB Homologue Carried in Plasmid pO157 Encodes an Acyltransferase Involved in Lipid A Biosynthesis in Escherichia coli O157:H7

机译:质粒pO157中携带的msbB同源物编码参与大肠杆菌O157:H7中脂质A生物合成的酰基转移酶

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Escherichia coli O157:H7 carries a chromosomal msbB1 and a plasmid-encoded msbB2 gene. We characterized msbB2 function as a homologue of msbB1 by examination of wild-type organisms and mutant strains that lacked functional msbB1, msbB2, and both msbB1 and msbB2. The msbB double-mutant strain generated pentaacyl lipid A, while the single-mutant strains synthesized hexaacyl lipid A. Complementation with overexpressed msbB2 converted pentaacyl into hexaacyl lipid A in the double-mutant strain. The transcription of both msbB genes occurred simultaneously. Lack of MsbB2 activity slightly increased the microheterogeneity of the lipid A species. These results suggest that the msbB2 gene plays a role not only in the routine generation of fully hexaacylated lipid A but also in suppressing the microheterogeneity of lipid A species, the endotoxic determinant of the organism.
机译:大肠杆菌 O157:H7带有染色体 msbB1 和质粒编码的 msbB2 基因。通过检查缺乏功能性 msbB1 msbB2 <的野生型生物和突变株,我们将 msbB2 功能表征为 msbB1 的同源物。 / em>,以及 msbB1 msbB2。 msbB 双突变株产生了戊酰基脂质A,而单突变株则合成了六酰基脂质。在双突变株中与过表达的 msbB2 的互补将戊酰基转化为六酰基脂质A。这两个 msbB 基因的转录同时发生。 MsbB2活性的缺乏会稍微增加脂质A物种的微异质性。这些结果表明, msbB2 基因不仅在常规的完全六酰化脂质A的常规生成中起作用,而且在抑制脂质A物种的微异质性中起着一定的作用,脂质A是生物体的内毒素决定因素。

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