Nucleic Acids Research, 1980, Vol. 8, No. 1 43-56
© 1980
Articles |
A site specific endonuclease from Thermus thermophilus 111, Tth1111
Mitsubishi-Kasei Institute of Life Sciences Minamiooya, Machida, Tokyo 194, Japan
Received November 1, 1979.
A site specific endonuclease with novel specificity has been isolated from Thermus thermophilus strain 111 and named Tth111I. Tth111I cleaves
DNA into three fragments of 23.5, 25.7 and 50.8 % of the total length, and ColE1 DNA into two fragments of nearly equal length. The sequences around Tth111I cleavage sites of ColE1 and
DNA were determined by the Maxam and Gilbert method and the two dimensional mapping method. The results suggest that Tth111I recognizes the DNA sequence
and cleaves the site as indicated by the arrows. Assuming that the first T. A pair in the sequence can be replaced for any base pair, the Tth111I recognition sequence has the symmetry with the two-fold axis as most type II restriction endonucleases do.
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