畜牧兽医学报 ›› 2010, Vol. 41 ›› Issue (7): 854-858.doi:

• 预防兽医 • 上一篇    下一篇

猪链球菌2型溶血素基因缺失菌株的构建及生物学特性的研究

王雅,张安定,李冉,胡攀,刘成,陈焕春,金梅林*   

  1. 华中农业大学动物医学院 农业微生物学国家重点实验室,武汉 430070
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2010-07-20 发布日期:2010-07-20
  • 通讯作者: 金梅林

Construction and Characteristic of Suilysin Gene Deleted Mutant Strain of Streptococcus suis Serotype 2

WANG Ya, ZHANG An-ding, LI Ran, HU Pan, LIU Cheng, CHEN Huan-chun, JIN Mei-lin*   

  1. State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine,Huazhong Agricultural University, Wuhan 430070, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2010-07-20 Published:2010-07-20

摘要: 溶血素(SLY)在猪链球菌2型(SS2)侵入和裂解细胞的过程中发挥重要作用,被认为是SS2的一种重要的毒力相关因子。为了探讨SLY在2005年中国四川资阳分离强毒株SS205ZY致病过程中的作用,作者利用同源重组基因敲除法成功构建了SS205ZY的sly基因敲除突变菌株(Δsly)。并比较了菌株的溶血能力以及对小鼠的致病力。结果表明sly基因敲除后可导致猪链球菌裂解红细胞的能力显著下降,对小鼠的致病力也有一定程度的减弱,但仍表现较高的致病力。本研究结果提示SLY是猪链球菌裂解细胞的重要毒力相关因子,但造成SS205ZY的高致病性很显然与多种毒力相关因子的协同作用有关。

Abstract: Suilysin plays an important role in invading and lysis of host cells by Streptococcus suis serotype 2 (SS2), and it has been believed to be an important virulence-associated factor. This experiment was conducted to study the role of Suilysin in the pathogenicity of the virulent strain SS205ZY isolated in 2005 in Sichuan Provice of China. The SS205ZY isogenic suilysin mutant was constructed through homologous recombination, and the hemolysis capability and virulence to mice between wild type strain and the Suilysin gene deleted mutant were compared. The results indicated that the isogenic Suilysin mutant showed decreased hemolysis capability and relative lower virulent to mice. The paper indicated that Suilysin was important virulence-associated factor and the high virulence of SS205ZY was involved with the synergistic effect of serveal virulence factors.