Stable, conserved outer membrane epitope of strains of Haemophilus influenzae biogroup aegyptius associated with Brazilian purpuric fever.

Stable, conserved outer membrane epitope of strains of Haemophilus influenzae biogroup aegyptius associated with Brazilian purpuric fever.
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与巴西紫癜相关的流感嗜血杆菌生物群埃及菌株的稳定、保守的外膜表位。

DOI:
10.1128/iai.60.4.1351-1357.1992
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发表时间:
1992
影响因子:
3.1
通讯作者:
Carlone,GM
Carlone,GM
中科院分区:
医学2区
文献类型:
--
作者:
Lesse,AJ;Gheesling,LL;Bittner,WE;Myers,SD;Carlone,GM

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巴西紫癜热是一种快速致死的儿童疾病,与埃及流感嗜血杆菌的克隆株有关。我们描述了一个保守的,表面暴露的表位上存在的95%的H。与巴西紫癜热相关的流感病毒埃及群分离株。该表位通过与单克隆抗体8 G3的反应来定义,位于48-kDa可热修饰的P1蛋白上或与其相关。该表位在H.流感病毒埃及群与巴西紫癜热无关,但存在于一种H.流感生物型II检测的81种其他嗜血杆菌菌株均未与8 G3反应。8 G3单克隆抗体检测巴西H.与巴西紫癜热相关的埃及型流感病毒的感染率分别为95%和99%。免疫电镜显示抗原表位是暴露的。流感嗜血杆菌埃及亚种P1蛋白N-末端氨基酸序列与已发表的H. influenzae-groupaegyptius的P1蛋白N-末端氨基酸序列具有100%的相关性。流感病毒B型。在菌血症的幼鼠模型中,该生物体的毒力不依赖于该表位的表达。
Brazilian purpuric fever is a rapidly fatal childhood disease associated with a clonal strain of Haemophilus influenzae biogroup aegyptius. We describe a conserved, surface-exposed epitope present on 95% of H. influenzae biogroup aegyptius isolates that are associated with Brazilian purpuric fever. This epitope, defined by reaction with the monoclonal antibody 8G3, is on or associated with the 48-kDa heat-modifiable P1 protein. The epitope is absent on strains of H. influenzae biogroup aegyptius that are not associated with Brazilian purpuric fever but is present on one strain of H. influenzae biotype II. None of 81 other Haemophilus strains tested reacted with 8G3. The sensitivity and specificity of the 8G3 monoclonal antibody in detecting Brazilian case-clone strains of H. influenzae biogroup aegyptius associated with Brazilian purpuric fever are 95 and 99%, respectively. Immunoelectron microscopy revealed that the epitope is surface exposed, and N-terminal amino acid sequencing of an 8G3-reactive P1 protein from a strain of H. influenzae biogroup aegyptius showed 100% correlation with the published N-terminal amino acid sequence of a P1 protein of H. influenzae type b. The virulence of the organism in an infant rat model of bacteremia was not dependent on the expression of this epitope.
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