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Identification and Molecular Analysis of the Gene Encoding Rickettsia typhi Hemolysin

机译:伤寒立克次体溶血素编码基因的鉴定与分子分析

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Rickettsia typhi, the causative agent of murine typhus, grows directly within the host cell cytoplasm, accumulating a large number of progeny, and eventually lyses the cells. Typhus group rickettsiae (R. typhi and R. prowazekii) adhere to and lyse human and sheep erythrocytes. However, the molecular mechanism underlying erythrocyte lysis by R. typhi has not been defined. Here we describe the cloning and nucleotide sequence analysis of the gene (tlyC) encoding a hemolysin fromR. typhi. DNA sequence analysis of R. typhi tlyC revealed an open reading frame of 912 bp, which encodes a protein of 304 amino acids with a predicted molecular mass of 38 kDa. To associate the R. typhi tlyC gene product with hemolytic activity, we performed complementation studies with hemolysin-negativeProteus mirabilis WPM111 (a HpmA? mutant of BA6163) transformed with R. typhi tlyC or R. typhi GFPuv-tlyC constructs. We demonstrated that the clonedtlyC gene conferred a hemolytic phenotype on an otherwise nonhemolytic mutant of P. mirabilis. The availability of the cloned R. typhi tlyC will permit further characterization and definition of its role in rickettsial virulence.
机译:鼠伤寒的病原菌直接在宿主细胞的细胞质内生长,积累了大量后代,最终裂解了细胞。斑疹伤寒立克次氏体( R。typhi R。prowazekii )粘附并溶解人和绵羊的红细胞。然而, R引起红细胞溶解的分子机制。 typhi 尚未定义。在这里,我们描述了编码 R溶血素的基因( tlyC )的克隆和核苷酸序列分析。伤寒 R的DNA序列分析。 typhi tlyC 揭示了一个912 bp的开放阅读框,该框编码304个氨基酸的蛋白质,预测分子量为38 kDa。关联 R。带有溶血活性的伤寒tylyC 基因产物,我们用转化的溶血素阴性变形杆菌 WPM111(BA6163的HpmA ?突变体)进行了互补研究R. typhi tlyC R。伤寒GFPuv-tlyC 构建体。我们证明了克隆的 tlyC 基因在 P的非溶血性突变体上具有溶血表型。奇迹。克隆的 R的可用性。 typhi tlyC 将允许进一​​步表征和定义其在立克次氏体毒力中的作用。

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