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首页> 外文期刊>Journal of bacteriology >Acquisition of the rfb-gnd Cluster in Evolution of Escherichia coli O55 and O157
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Acquisition of the rfb-gnd Cluster in Evolution of Escherichia coli O55 and O157

机译:在大肠杆菌O55和O157进化中获取rfb-gnd簇

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摘要

The rfb region specifies the structure of lipopolysaccharide side chains that comprise the diverse gram-negative bacterial somatic (O) antigens. The rfb locus is adjacent to gnd, which is a polymorphic gene encoding 6-phosphogluconate dehydrogenase. To determine if rfb andgnd cotransfer, we sequenced gnd in five O55 and 13 O157 strains of Escherichia coli. E. coli O157:H7 has a gnd allele (allele A) that is only 82% identical to the gnd allele (alleleD) of closely related E. coli O55:H7. In contrast, gnd alleles of E. coli O55 in distant lineages are >99.9% identical to gnd alleleD. Though gnd alleles B andC in E. coli O157 that are distantly related toE. coli O157:H7 are more similar to allele Athan to allele D, there are nucleotide differences at 4 to 6% of their sites. Alleles B and C can be found in E. coli O157 in different lineages, but we have found allele A only in E. coli O157 belonging to the DEC5 lineage. DNA 3′ to the O55 gnd allele in diverse E. coli lineages has sequences homologous totnpA of the Salmonella enterica serovar Typhimurium IS200 element, E. coli Rhs elements (including an H-rpt gene), and portions of the O111 and O157rfb regions. We conclude that rfb andgnd cotransferred into E. coli O55 and O157 in widely separated lineages and that recombination was responsible for recent antigenic shifts in the emergence of pathogenic E. coli O55 and O157.
机译: rfb 区指定了包含多种革兰氏阴性细菌体细胞(O)抗原的脂多糖侧链的结构。 rfb 基因座与 gnd 相邻,后者是编码6-磷酸葡萄糖酸脱氢酶的多态性基因。为了确定 rfb gnd 是否共转移,我们在5个O55和13个O157大肠杆菌菌株中对 gnd 进行了测序。大肠杆菌O157:H7的 gnd 等位基因(等位基因 A )与 gnd 等位基因(紧密相关的 E等位基因 D )。大肠杆菌O55:H7。相反, E的 gnd 个等位基因。远缘谱系中的大肠杆菌 O55与 gnd 等位基因 D 的同源性> 99.9%。尽管 gnd 等位基因在 E中是 B C 。与 E密切相关的大肠杆菌 O157。 O157:H7与等位基因 A 相似,而与等位基因 D 相似,在其位点的4%至6%之间存在核苷酸差异。等位基因 B C 可以在 E中找到。大肠杆菌O157在不同的谱系中,但是我们仅在 E中发现了等位基因 A 。大肠杆菌 O157,属于DEC5谱系。 O55 gnd 等位基因在不同的 E中的DNA 3'。大肠埃希氏菌谱系的序列与肠炎沙门氏菌血清型鼠伤风IS 200 元素 E的 tnpA 同源。大肠杆菌Rhs 元素(包括H-rpt基因)以及O111和O157 rfb 部分区域。我们得出结论, rfb gnd 共转移到了 E中。大肠杆菌O55和O157在广泛分离的谱系中发生,并且重组是致病性 E出现中最近的抗原变化的原因。大肠杆菌O55和O157。

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