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In Vitro Directed Evolution of a Restriction Endonuclease with More Stringent Specificity
Published on: March 25, 2020
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Improving selectivity of DNA-RNA binding zinc finger using directed evolution.
1Laboratory of Bioinformatics and Protein Engineering, International Institute of Molecular and Cell Biology, Ks. Trojdena 4, 02-109, Warsaw, Poland. asulej@iimcb.gov.pl.
BMC Research Notes
|December 6, 2019
Summary
Researchers engineered zinc finger proteins to bind DNA-RNA hybrids. Directed evolution of linker sequences improved specificity for DNA-RNA targets over double-stranded DNA.
Area of Science:
- Molecular Biology
- Protein Engineering
- Biochemistry
Background:
- Type C2H2 zinc fingers are versatile DNA-binding proteins.
- Previous engineering efforts established rules for DNA sequence targeting.
- Targeting DNA-RNA hybrids presents unique challenges due to sequence and structural differences.
Purpose of the Study:
- To establish rules for engineering zinc fingers to bind specific DNA-RNA hybrid sequences.
- To utilize directed evolution on the ZfQQR zinc finger to achieve DNA-RNA hybrid specificity.
- To investigate the role of amino acid residues and linker sequences in substrate binding.
Main Methods:
- Directed evolution using phage-displayed libraries of randomized ZfQQR zinc finger variants.
- Biopanning selection strategies to identify variants with altered binding specificities.
- Focus on randomizing amino acid residues involved in substrate interaction and inter-module linkers.
Main Results:
- Randomization of the central zinc finger module was hindered in achieving altered specificity.
- Directed evolution of the linker sequence successfully selected for variants with improved selectivity towards DNA-RNA hybrids.
- Variants showed enhanced binding to DNA-RNA hybrids compared to double-stranded DNA, relative to the original ZfQQR.
Conclusions:
- Linker sequence optimization is crucial for modulating zinc finger protein specificity.
- Directed evolution can be employed to engineer zinc fingers for novel nucleic acid targets like DNA-RNA hybrids.
- The study highlights the importance of linker regions in protein-protein and protein-nucleic acid interactions.
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