Nucleic Acids Research, 1985, Vol. 13, No. 18 6679-6693
© 1985
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Nucleotlde sequence characterization of Ty 117 , a class II transposon from yeast
Department of Biochemistry and Applied Molecular Biology, University of Manchester Institute for Science and Technology P.O. Box 88, Manchester M60 1QD, UK +Department of Microbiology, UMDNJ-New Jersey Medical School 100 Bergen Street, Newark, NJ 07103, USA
*To whom correspondence should be addressed
Received July 29, 1985. Revised September 3, 1985. Accepted September 3, 1985.
We have determined the nucleotide sequence of a class II yeast transposon (Ty 117) which is found just centromere-distal to the LEU2 structural gene on chromosome III of Saccharomyces cerevisiae. The complete element is 5961 bp long and is bounded by two identical, directly repeated, delta sequences of 332 bp each. The sequence organization indicates that Ty 117 is a retrotransposon, like the class I elements characterized previously. It contains two long open reading-frames, TyA (439 amino acids) and TyB (1349 amino acids). In this paper, the sequences of the two classes of yeast transposon are compared with one another and with analogous elements, such as retroviral proviruses, cauliflower mosaic virus and copia sequences. Features of the Ty 117 sequence which may be important to its mechanism of transposition and its genetic action are discussed.
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