畜牧兽医学报 ›› 2015, Vol. 46 ›› Issue (11): 2056-2062.doi: 10.11843/j.issn.0366-6964.2015.11.019

• 预防兽医 • 上一篇    下一篇

副猪嗜血杆菌lgtF基因缺失株的构建及其部分生物学特性

曾泽,何欢,岳华,汤承,张斌*   

  1. (西南民族大学 生命科学与技术学院,成都 610041)
  • 收稿日期:2015-03-04 出版日期:2015-11-23 发布日期:2015-11-23
  • 通讯作者: 张斌,副研究员,E-mail:binovy@sina.com
  • 作者简介:曾泽(1991-),女,贵州毕节人,硕士生,主要从事动物病原分子生物学,E-mail:839017291@qq.com
  • 基金资助:

    国家自然科学基金(31302119);四川省教育厅项目(14ZB046);公益性行业(农业)科研专项(201303034-1);西南民族大学中央高校基本科研业务费专项(2014NZYQN42)

Construction and Characterization of a Haemophilus parasuis SC096 ΔlgtF Mutant Strain

ZENG Ze,HE Huan,YUE Hua,TANG Cheng,ZHANG Bin*   

  1. (College of Life Science and Technology,Southwest University for Nationalities,Chengdu 610041,China)
  • Received:2015-03-04 Online:2015-11-23 Published:2015-11-23

摘要:

lgtF基因编码的葡萄糖基转移酶在脂寡糖(LOS)的合成过程中负责增加一个葡萄糖合成庚糖I,在部分革兰阴性菌中是重要的毒力相关基因,但lgtF基因在副猪嗜血杆菌(Haemophilus parasuis,HPS)中的作用还不清楚。本研究利用遗传操作方法构建HPS SC096的lgtF基因缺失株(ΔlgtF)。通过热酚法分别提取缺失株与野生株的LOS,将提取的LOS进行SDS-PAGE和银染。比较缺失株与野生株的生长曲线、抗血清中补体杀菌能力以及对宿主细胞——猪血管内皮细胞(PUVEC)和猪肾上皮细胞(PK-15)的黏附和入侵能力。结果表明与野生株相比,ΔlgtF的LOS糖链结构变短,生长速度稍微减慢,另外,ΔlgtF在兔和猪血清中抗补体杀菌能力明显降低(P<0.05),对PUVEC和PK-15细胞的黏附入侵能力明显降低(P<0.05)。以上结果表明lgtF基因是HPS的一个毒力相关基因。

Abstract:

The lgtF encodes a glucosyltransferase responsible for adding a glucose to get heptose I in the synthesis of Lipooligosaccharide (LOS).The lgtF gene is an important virulence-associated gene in some Gram-negative bacteria.However,the function of lgtF gene in Haemophilus parasuis was still unknown.We constructed an ΔlgtF mutant (ΔlgtF) of H.parasuis SC096 using a natural transformation system.The LOS of H.parasuis SC096 strain,ΔlgtF mutant was extracted by the hot phenol-water method.The LOS was addressed by SDS-PAGE and sliver stain.The growth curve,Serum resistance activity,adhesion and invasion ability in porcine kidney epithelial cells (PK-15) and porcine umbilical vein endothelial cells (PUVEC) of wild type SC096 and ΔlgtF mutant were measured.Compared to the wild-type SC096 strain,the ΔlgtF mutant exhibited obvious truncation of LOS structure and slight growth defect.Furthermore,the mutant had a greater sensitivity to the bactericidal action of porcine and rabbit serum (P<0.05),and displayed a significantly reduced ability to adhere to and invade PK-15 and PUVEC (P<0.05).The above findings suggested that the lgtF gene is a virulence-associated gene of the H.parasuis SC096 strain.

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