首页> 外文期刊>Infection and immunity >The UDP N-Acetylgalactosamine 4-Epimerase Gene Is Essential for Mesophilic Aeromonas hydrophila Serotype O34 Virulence
【24h】

The UDP N-Acetylgalactosamine 4-Epimerase Gene Is Essential for Mesophilic Aeromonas hydrophila Serotype O34 Virulence

机译:UDP N-乙酰半乳糖胺4-表异构酶基因对于嗜温嗜水气单胞菌血清型O34毒力至关重要

获取原文
           

摘要

Mesophilic Aeromonas hydrophila strains of serotype O34 typically express smooth lipopolysaccharide (LPS) on their surface. A single mutation in the gene that codes for UDP N-acetylgalactosamine 4-epimerase (gne) confers the O? phenotype (LPS without O-antigen molecules) on a strain in serotypes O18 and O34, but not in serotypes O1 and O2. The gne gene is present in all the mesophilic Aeromonas strains tested. No changes were observed for the LPS core in a gne mutant from A. hydrophila strain AH-3 (serotype O34). O34 antigen LPS contains N-acetylgalactosamine, while no such sugar residue forms part of the LPS core from A. hydrophila AH-3. Some of the pathogenic features of A. hydrophila AH-3 gne mutants are drastically reduced (serum resistance or adhesion to Hep-2 cells), and the gne mutants are less virulent for fish and mice compared to the wild-type strain. Strain AH-3, like other mesophilic Aeromonas strains, possess two kinds of flagella, and the absence of O34 antigen molecules by gne mutation in this strain reduced motility without any effect on the biogenesis of both polar and lateral flagella. The reintroduction of the single wild-type gne gene in the corresponding mutants completely restored the wild-type phenotype (presence of smooth LPS) independently of the O wild-type serotype, restored the virulence of the wild-type strain, and restored motility (either swimming or swarming).
机译:O34型嗜温嗜水气单胞菌菌株通常在其表面表达光滑脂多糖(LPS)。编码UDP N-乙酰半乳糖胺4-表异构酶( gne )的基因中的单个突变赋予O ?表型(没有O- O18和O34血清型,但O1和O2血清型则没有。 gne 基因存在于所有测试的嗜温性 Aeromonas 菌株中。没有观察到来自 A的 gne 突变体中LPS核心的变化。亲水株AH-3(O34型)。 O34抗原LPS含有 N-乙酰半乳糖胺,而没有任何糖残基形成 A的LPS核心。亲水性 AH-3。 A的某些致病特征。亲水性 AH-3 gne 突变体显着降低(血清抗性或对Hep-2细胞的粘附), gne 突变体对鱼类和小鼠的毒性较低与野生型菌株相比。 AH-3菌株与其他嗜温性 Aeromonas 菌株一样,具有两种鞭毛,并且该菌株中缺少 gne 突变的O34抗原分子,降低了运动能力,但对极鞭毛和侧鞭毛的生物发生。在相应的突变体中重新引入单个野生型 gne 基因完全独立于O野生型血清型,完全恢复了野生型表型(存在光滑LPS),恢复了野生型的毒力。型应变,恢复活力(游泳或蜂拥而至)。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号