Green E P, Tizard M L, Moss M T, Thompson J, Winterbourne D J, McFadden J J, Hermon-Taylor J
Department of Surgery, St Georges Hospital Medical School, London, UK.
Nucleic Acids Res. 1989 Nov 25;17(22):9063-73. doi: 10.1093/nar/17.22.9063.
The complete sequence of an insertion element IS900 in Mycobacterium paratuberculosis is reported. This is the first characterised example of a mycobacterial insertion element. IS900 consists of 1451bp of which 66% is G + C. It lacks terminal inverted and direct repeats, characteristic of Escherichia coli insertion elements but shows a degree of target sequence specificity. A single open reading frame (ORF 1197) coding for 399 amino acids is predicted. This amino acid sequence, and to a lesser extent the nucleotide sequence, show significant homologies to IS110, an insertion element of Streptomyces coelicolor A3(2). It is proposed that IS900, IS110, and similar insertion elements recently identified in disease isolates of Mycobacterium avium are members of a phylogenetically related family. IS900 will provide highly specific markers for the precise identification of Mycobacterium paratuberculosis, useful in defining its relationship to animal and human diseases.
报道了副结核分枝杆菌中插入元件IS900的完整序列。这是分枝杆菌插入元件的首个经鉴定的实例。IS900由1451个碱基对组成,其中66%为G + C。它缺乏大肠杆菌插入元件所特有的末端反向重复序列和正向重复序列,但表现出一定程度的靶序列特异性。预测有一个编码399个氨基酸的单一开放阅读框(ORF 1197)。该氨基酸序列以及在较小程度上的核苷酸序列与天蓝色链霉菌A3(2)的插入元件IS110具有显著同源性。有人提出,IS900、IS110以及最近在鸟分枝杆菌疾病分离株中鉴定出的类似插入元件是一个系统发育相关家族的成员。IS900将为副结核分枝杆菌的精确鉴定提供高度特异性的标记,有助于确定其与动物和人类疾病的关系。