Related Experiment Videos
A new restriction endonuclease from Citrobacter freundii.
Nucleic Acids Research
|October 25, 1982
Summary
A novel restriction enzyme, CfrI, was discovered in Citrobacter freundii. This enzyme uniquely targets and cleaves specific DNA sequences, producing tetranucleotide ends for molecular biology applications.
Area of Science:
- Molecular Biology
- Enzymology
- Genetics
Background:
- Restriction enzymes are crucial tools in molecular biology for DNA manipulation.
- The discovery of novel enzymes with unique specificities expands the toolkit for genetic engineering.
Purpose of the Study:
- To isolate and characterize a new restriction endonuclease from a Citrobacter freundii strain.
- To determine the substrate specificity and cleavage pattern of the novel enzyme.
Main Methods:
- Isolation and purification of the restriction endonuclease CfrI from Citrobacter freundii.
- DNA substrate analysis to determine recognition sequence and cleavage site.
- Characterization of the resulting DNA ends.
Main Results:
- A new restriction endonuclease, designated CfrI, was successfully isolated.
- CfrI recognizes the degenerate DNA sequence PyGGCCPu.
- The enzyme cleaves between Py and G, generating 5'-protruding tetranucleotide GGCC ends.
Conclusions:
- CfrI is a unique restriction enzyme with a novel recognition site.
- The specific cleavage pattern of CfrI offers new possibilities for DNA manipulation and cloning.
- This discovery contributes to the repertoire of restriction enzymes available for biotechnological applications.