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肠出血性大肠杆菌O157:H7△hly△stx△toxB基因缺失株的构建

DOI: 10.7668/hbnxb.2011.05.016, PP. 76-82

Keywords: 肠出血性大肠杆菌O157:H7,hly,stx,toxB,缺失株,小鼠,粘附

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Abstract:

肠出血性大肠杆菌(EnterohemorrhagicEscherichiacoli)O157:H7是食源感染的人兽共患病原菌。志贺毒素(Shigatoxin,Stx)、溶血素(haemolysin,Hly)和ToxB是O157:H7重要的毒力因子。选用自杀性质粒pMEG375,体外构建具有同源臂的重组自杀性质粒,借助于sm10宿主菌获得O157:H7杂交菌株,通过同源重组,依次获得O157:H7(△hly△stx△toxB)基因缺失株,△hly△stx△toxB接种HEp-2细胞和感染链霉素处理的Balb/c小鼠,明确缺失株粘附定植的能力。经PCR鉴定,hly、stx和toxB基因分别被壮观霉素(Spc+)、庆大霉素(Gm+)和卡那霉素(Kan+)基因表达盒所代替,Westernblot鉴定结果显示,O157:H7(△hly△stx△toxB)检测不到相应的Stx、Hly和ToxB蛋白。O157:H7(△hly△stx△toxB)生长特性与亲本株无明显差异。对于HEp-2细胞的粘附能力明显降低。Balb/c小鼠排菌时间和排菌量明显减少和降低。本研究成功获得O157:H7(△hly△stx△toxB),并且明确Stx、Hly和ToxB的缺失导致了O157:H7对HEp-2细胞和Balb/c小鼠的粘附和定植能力降低。本研究旨在为研制EHECO157:H7基因缺失疫苗奠定物质基础。

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