Abstract
Three phenotypically stable mutants of the extremely thermophilic archaeon Sulfolobus solfataricus have been isolated by screening for β-galactosidase negative colonies on plates with X-Gal (5-bromo-4-chloro-3-indolyl-(3-d-galactopyranoside). From one of these mutants an insertion element, designated ISC1217, was isolated and characterized. Sequence analysis of ISC1217 and of the regions adjacent to the insertion site in the β-galactosidase gene revealed features typical of a transposable element: ISC1217 contained terminal inverted repeats and was flanked by a direct repeat of 6 bp. The 1147 by sequence contained an open reading frame encoding a putative protein of 354 amino acid residues and, overlapping this, two smaller open reading frames on the opposite strand. There were approximately 8 copies of the insertion element in the S. solfataricus genome. ISC1217 did not cross-hybridize with DNA of other Sulfolobus species. All three independently isolated β-galactosidase mutants of S. solfataricus arose by transposition of ISC1217 or a related element.
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Schleper, C., Röder, R., Singer, T. et al. An insertion element of the extremely thermophilic archaeon Sulfolobus solfataricus transposes into the endogenous β-galactosidase gene. Molec. Gen. Genet. 243, 91–96 (1994). https://doi.org/10.1007/BF00283880
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DOI: https://doi.org/10.1007/BF00283880