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首页> 外文期刊>Journal of bacteriology >The Wzz (Cld) Protein in Escherichia coli: Amino Acid Sequence Variation Determines O-Antigen Chain Length Specificity
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The Wzz (Cld) Protein in Escherichia coli: Amino Acid Sequence Variation Determines O-Antigen Chain Length Specificity

机译:大肠杆菌中的Wzz(Cld)蛋白:氨基酸序列变异确定O抗原链长度特异性

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The O antigen is a polymer with a repeated unit. The chain length in most Escherichia coli strains has a modal value of 10 to 18 O units, but other strains have higher or lower modal values.wzz (cld/rol) mutants have a random chain length distribution, showing that the modal distribution is determined by the Wzz protein. Cloned wzz genes from E. coli strains with short (7 to 16), intermediate (10 to 18), and long (16 to 25) modal chain lengths were transferred to a model system, and their effects on O111 antigen were studied. The O111 chain length closely resembled that of the parent strains. We present data based on the construction of chimeric wzz genes and site-directed mutagenesis of the wzz gene to show that the modal value of O-antigen chain length of E. coli O1, O2, O7, and O157 strains can be changed by specific amino acid substitutions in wzz. It is concluded that the O-antigen chain length heterogeneity in E. coli strains is the result of amino acid sequence variation of the Wzz protein.
机译:O抗原是具有重复单元的聚合物。大多数大肠杆菌菌株的链长模态值为10至18 O个单位,而其他菌株的模态值则更高或更低。 wzz cld / rol )突变体具有随机的链长分布,表明模态分布由Wzz蛋白决定。从 E克隆了 wzz 基因。将具有较短(7至16个),中间(10至18个)和较长(16至25个)模式链长度的大肠杆菌菌株转移到模型系统中,并研究其对O111抗原的影响。 O111的链长非常类似于亲本菌株。我们基于嵌合的 wzz 基因的构建和 wzz 基因的定点诱变提供数据,以证明的O-抗原链长的模态值E.可以通过 wzz 中的特定氨基酸替换来改变大肠杆菌O1,O2,O7和O157菌株。结论是 E中的O-抗原链长度异质性。大肠杆菌菌株是Wzz蛋白氨基酸序列变异的结果。

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