普氏立克次体中延伸因子基因的嵌合排列。
A chimeric disposition of the elongation factor genes in Rickettsia prowazekii.
作者信息
Syvänen A C, Amiri H, Jamal A, Andersson S G, Kurland C G
机构信息
Department of Molecular Biology, Biomedical Center, Uppsala University, Sweden.
出版信息
J Bacteriol. 1996 Nov;178(21):6192-9. doi: 10.1128/jb.178.21.6192-6199.1996.
Abstract
An exceptional disposition of the elongation factor genes is observed in Rickettsia prowazekii, in which there is only one tuf gene, which is distant from the lone fus gene. In contrast, the closely related bacterium Agrobacterium tumefaciens has the normal bacterial arrangement of two tuf genes, of which one is tightly linked to the fus gene. Analysis of the flanking sequences of the single tuf gene in R. prowazekii shows that it is preceded by two of the four tRNA genes located in the 5' region of the Escherichia coli tufB gene and that it is followed by rpsJ as well as associated ribosomal protein genes, which in E. coli are located downstream of the tufA gene. The fus gene is located within the str operon and is followed by one tRNA gene as well as by the genes secE and nusG, which are located in the 3' region of tufB in E. coli. This atypical disposition of genes suggests that intrachromosomal recombination between duplicated tuf genes has contributed to the evolution of the unique genomic architecture of R. prowazekii.
摘要
在普氏立克次体中观察到延伸因子基因的一种特殊排列，其中只有一个tuf基因，它与唯一的fus基因相距较远。相比之下，密切相关的细菌根癌土壤杆菌具有两个tuf基因的正常细菌排列，其中一个与fus基因紧密相连。对普氏立克次体中单个tuf基因侧翼序列的分析表明，它前面是位于大肠杆菌tufB基因5'区域的四个tRNA基因中的两个，后面是rpsJ以及相关的核糖体蛋白基因，这些基因在大肠杆菌中位于tufA基因的下游。fus基因位于str操纵子内，后面跟着一个tRNA基因以及secE和nusG基因，这些基因位于大肠杆菌tufB基因的3'区域。这种基因的非典型排列表明，重复的tuf基因之间的染色体内重组促成了普氏立克次体独特基因组结构的进化。
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