Zhang Chengxian, Rausch Dana, Zhang Weiping
Department of Veterinary Science, South Dakota State University, The Center for Infectious Disease Research & Vaccinology, Brookings, South Dakota, USA.
Appl Environ Microbiol. 2009 Oct;75(19):6402-5. doi: 10.1128/AEM.00952-09. Epub 2009 Aug 14.
To examine whether the heat-labile enterotoxin gene in porcine enterotoxigenic Escherichia coli (ETEC) strains is as divergent as in human ETEC strains, we sequenced the heat-labile and heat-stable toxin genes from 52 and 33 porcine ETEC strains, respectively. We found that the STa gene is identical, that the LT gene has only two mutations in 4 (of 52) strains, and that both mutations cause a reduction in GM1 binding and toxicity.
为了研究猪产肠毒素大肠杆菌(ETEC)菌株中的不耐热肠毒素基因是否与人ETEC菌株中的一样具有多样性,我们分别对52株和33株猪ETEC菌株的不耐热和耐热毒素基因进行了测序。我们发现,耐热肠毒素a(STa)基因是相同的,不耐热肠毒素(LT)基因在52株中的4株中仅有两个突变,且这两个突变均导致GM1结合能力和毒性降低。