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SrfI, a new type-II restriction endonuclease that recognizes the octanucleotide sequence, [sequence: see text].
T G Simcox1, S J Marsh, E A Gross
1Stratagene Cloning Systems, Inc., La Jolla, CA 92037.
Gene
|December 20, 1991
Summary
A novel restriction enzyme, SrfI, was discovered from Streptomyces. This rare-cutting enzyme recognizes an 8-base pair palindrome and generates blunt DNA ends, making it valuable for large-scale genome mapping.
Area of Science:
- Molecular Biology
- Enzymology
- Genomics
Background:
- Restriction endonucleases are crucial tools in molecular biology for DNA manipulation.
- Identifying novel enzymes with unique recognition sites expands the toolkit for genomic analysis.
- Rare-cutting enzymes are particularly important for mapping large DNA fragments.
Purpose of the Study:
- To isolate and characterize a new restriction endonuclease from an unidentified Streptomyces species.
- To determine the DNA recognition sequence and cleavage site of the novel enzyme.
- To evaluate the enzyme's potential applications in large-scale DNA mapping.
Main Methods:
- Isolation and purification of the restriction endonuclease from Streptomyces.
- DNA substrate preparation for enzyme activity assays.
- Determination of the specific DNA recognition sequence (palindrome) and cleavage pattern.
Main Results:
- A new restriction endonuclease, designated SrfI, was successfully isolated.
- SrfI recognizes the 8-base pair palindrome sequence 5'-GCCCGGGC.
- The enzyme cleaves double-stranded DNA after the third cytosine, producing blunt ends.
Conclusions:
- SrfI is a novel rare-cutting restriction enzyme.
- Its unique recognition site and blunt-end generation offer new possibilities for DNA manipulation.
- SrfI is a promising tool for megabase mapping and other large-genome analyses.