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Design, activity, and structure of a highly specific artificial endonuclease
Brett S Chevalier1, Tanja Kortemme, Meggen S Chadsey
1Fred Hutchinson Cancer Research Center and Graduate Program in Molecular and Cell Biology, University of Washington, 1100 Fairview Avenue N. A3-023, Seattle, WA 98109, USA.
Molecular Cell
|November 7, 2002
Summary
Scientists engineered a new enzyme, E-DreI, by combining two natural endonucleases. This engineered protein precisely cuts DNA, showing potential for creating novel DNA-binding proteins.
Area of Science:
- Protein engineering
- Molecular biology
- Biochemistry
Background:
- Homing endonucleases like I-DmoI and I-CreI are highly specific DNA-cutting enzymes.
- Protein engineering offers a route to create novel enzymes with tailored specificities.
Purpose of the Study:
- To engineer a novel, highly specific endonuclease by combining domains from I-DmoI and I-CreI.
- To validate the protein interface redesign algorithm and assess the enzyme's function.
Main Methods:
- Fusion of I-DmoI and I-CreI endonuclease domains.
- Computational protein redesign.
- In vivo protein-folding screen for functional assessment.
- Structural analysis of the engineered enzyme-DNA complex.
Main Results:
- Generation of a new endonuclease, E-DreI (Engineered I-DmoI/I-CreI).
- E-DreI exhibits high affinity (nanomolar) for a specific chimeric DNA target.
- Precise DNA cleavage at a rate comparable to parent enzymes.
- Structural data confirm the accuracy of the redesigned protein interface.
Conclusions:
- The protein interface redesign algorithm is effective for creating novel endonucleases.
- Engineered endonucleases like E-DreI can maintain catalytic function.
- This approach demonstrates the potential for generating new, highly specific DNA-binding proteins from homing endonucleases.