Andrews G P, Strachan S T, Benner G E, Sample A K, Anderson G W, Adamovicz J J, Welkos S L, Pullen J K, Friedlander A M
Division of Bacteriology, United States Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, Maryland 21702-5011, USA.
Infect Immun. 1999 Mar;67(3):1533-7. doi: 10.1128/IAI.67.3.1533-1537.1999.
To evaluate the role of Yersinia outer proteins (Yops) in conferring protective immunity against plague, six yop loci from Yersinia pestis were individually amplified by PCR, cloned, and expressed in Escherichia coli. The recombinant proteins were purified and injected into mice. Most Yop-vaccinated animals succumbed to infection with either wild-type encapsulated Y. pestis or a virulent, nonencapsulated isogenic variant. Vaccination with YpkA significantly prolonged mean survival time but did not increase overall survival of mice infected with the nonencapsulated strain. The only significant protection against death was observed in YopD-vaccinated mice challenged with the nonencapsulated strain.
为评估耶尔森氏菌外膜蛋白(Yops)在赋予鼠疫保护性免疫方面的作用,通过聚合酶链反应(PCR)分别扩增、克隆来自鼠疫耶尔森氏菌的6个yop基因座,并在大肠杆菌中表达。将重组蛋白纯化后注射到小鼠体内。大多数接种Yop的动物死于野生型包膜鼠疫耶尔森氏菌或无毒力、非包膜同基因变体的感染。接种YpkA可显著延长平均存活时间,但未提高感染非包膜菌株小鼠的总体存活率。在接种YopD的小鼠受到非包膜菌株攻击时,观察到了唯一显著的抗死亡保护作用。