Cloning and sequence analysis of a novel insertion element from plasmids harbored by the carbofuran-degrading bacterium, Sphingomonas sp. CFO6

被引:12
作者
Feng, XH
Ou, LT
Ogram, A
机构
[1] UNIV FLORIDA, DEPT SOIL & WATER SCI, GAINESVILLE, FL 32611 USA
[2] WASHINGTON STATE UNIV, DEPT CROP & SOIL SCI, PULLMAN, WA 99164 USA
关键词
D O I
10.1006/plas.1997.1289
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
Sphingomonas sp. CF06 (a member of the alpha group of Proteobacteria) was isolated from a Washington soil by enrichment on the insecticide carbofuran as a sole source of carbon and energy. This strain has been shown to harbor five plasmids, at least some of which are required for catabolism of carbofuran. Rearrangements, deletions, and loss of individual plasmids resulting in the loss of the carbofuran-degrading phenotype were observed following treatment with heat or introduction of Tn5. Several putative insertion sequence elements of different sizes were cloned from these plasmids by trapping in pUCD800, a positive selection vector for isolation of transposable elements. Three of the most common putative IS elements (designated IS1412, IS1487, and IS1488) in the clone library were of different sizes and cross-hybridize with each other. An element hybridizing with IS1412, IS1487, and IS1488 was mobilized during growth of CF06 at 42 degrees C. and inserted into one of CF06's plasmids (pCFO4), corresponding to a deletion in the plasmid and a loss of catabolic function. IS1412 was completely sequenced and its sequence analyzed. IS1412 is 1656 bp in length and possesses terminal partially matched inverted repeats of unequal length (17 and 18 bp). In addition, IS1412 contains an open reading frame which encodes a putative transposase with significant homology to the putative transposases of IS1380 from Acetobacter pasteurianus, HRS1 from Bradyrhizobium japonicum, and IS1247 from Xanthobacter autotrophicus. These related IS elements form part of a family of common IS elements distributed among members of the alpha group of the Proteobacteria. (C) 1997 Academic Press.
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页码:169 / 179
页数:11
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