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[Substrate specificity of restriction endonuclease Eco781]
Bioorganicheskaia Khimiia
|November 1, 1985
Summary
Restriction endonuclease Eco78I recognizes the 5'-GGCGCC- sequence and cleaves DNA to produce flush ends. This unique cleavage pattern distinguishes it from other enzymes, like NarI and BbeI, that recognize the same sequence but yield different protruding ends.
Area of Science:
- Molecular Biology
- Enzymology
- Genetics
Background:
- Restriction endonucleases are crucial tools in molecular biology for DNA manipulation.
- Several restriction enzymes recognize the 5"-GGCGCC-" sequence, but exhibit varied cleavage patterns.
Purpose of the Study:
- To determine the recognition sequence and cleavage point of the restriction endonuclease Eco78I.
- To characterize the cleavage activity of Eco78I and compare it with known isoschizomers.
Main Methods:
- DNA sequencing techniques to identify the recognition site.
- Enzymatic assays to determine the cleavage pattern of Eco78I on DNA substrates.
Main Results:
- The recognition sequence for Eco78I was identified as 5 -GGCGCC-3 .
- Eco78I generates flush ends upon cleavage, unlike other enzymes recognizing the same sequence.
- Isoschizomers NarI, NdaI, and NunII produce 5 -protruding ends, while BbeI produces 3 -protruding ends.
Conclusions:
- Restriction endonuclease Eco78I possesses a unique specificity due to its flush-end cleavage.
- Eco78I represents a novel enzyme within the group of restriction endonucleases that recognize the 5 -GGCGCC-3 sequence.