PHENOTYPIC-EXPRESSION OF RECOMBINANT PLASMIDS PKT107 AND PHK11 IN AN AVIRULENT AVIAN ESCHERICHIA-COLI

被引:12
作者
WOOLEY, RE
NOLAN, LK
BROWN, J
GIBBS, PS
BOUNOUS, DI
机构
[1] N DAKOTA STATE UNIV,DEPT VET & MICROBIOL SCI,FARGO,ND 58105
[2] UNIV GEORGIA,COLL VET MED,DEPT PATHOL,ATHENS,GA 30602
关键词
D O I
10.2307/1591845
中图分类号
S85 [动物医学(兽医学)];
学科分类号
0906 ;
摘要
An avirulent wild-type avian Escherichia coli strain (Av) was electrotransformed with plasmids coding for complement resistance (pKT107) and Colicin V (ColV) production (pHK11) in order to study the effects of complement resistance and ColV production on virulence. Transformants were also compared with the wild type for embryo lethality, uptake by macrophages, motility, growth rate, plasmid content, and hemolysis. Growth rates and complement resistance patterns of strain Av and transformant Av+pHK11 were similar, but Av+pHK11 caused a significantly greater number of deaths in embryos and acquired motility. Transformant Av+pKT107 had a lower rate of phagocytosis, a slower growth rate, and a greater sensitivity to complement, and it changed from being non-hemolytic to expressing a-hemolytic action. The 35-kb plasmid present in the wild type was not present in the transformants. Although some of the results demonstrate the difficulties encountered in using wild-type organisms as recipients in virulence studies, the results with Av+pHK11 indicate that ColV production plus the acquisition of motility contributes to the virulence of avian E. coli.
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页码:127 / 134
页数:8
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