Nucleic Acids Research, 1980, Vol. 8, No. 15 3275-3285
© 1980
ENZYMOLOGY |
A second site specific endonuclease from Thermus thermophilus 111, Tth111II
Mitsubishi-Kasei Institute of Life Sciences 11 Minamiooya, Machida, Tokyo 194, Japan
Received June 20, 1980.
A second site specific endonuclease with novel specificity has been purified from Thermus thermophilus strain 111 and named Tth111II. The enzyme is active at temperature up to 80°C and requires Mg2+ or Mn2+ for endonuclease activity. Tth111II cleaves
X174RFDNA into 11 fragments and lambda DNA into more than 25 fragments. From the 5'-terminal sequences of Tth111II fragments of
X174RFDNA determined by the two dimensional homochromatography and the survey on nucleotide sequence of
X174RFDNA, it was concluded that Tth111II recognizes the DNA sequence
and cleaves the sites as indicated by the arrows.
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