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Related Experiment Videos

Chimeric restriction endonuclease

Y G Kim1, S Chandrasegaran

  • 1Department of Environmental Health Sciences, School of Hygiene and Public Health, Johns Hopkins University, Baltimore, MD 21205-2179.

Proceedings of the National Academy of Sciences of the United States of America
|February 1, 1994
PubMed
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Researchers engineered a hybrid enzyme by combining a DNA-binding domain with a cleavage domain. This novel restriction endonuclease, Ubx-FN, demonstrates specific DNA recognition and cleavage, offering potential for genome mapping.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genomics

Background:

  • Fok I restriction endonuclease possesses distinct DNA-binding and cleavage domains.
  • Understanding domain function is crucial for engineering novel enzymatic tools.

Purpose of the Study:

  • To construct a chimeric restriction endonuclease by fusing the Drosophila Ultrabithorax (Ubx) homeodomain to the Fok I cleavage domain (FN).
  • To characterize the DNA-binding and cleavage properties of the resulting hybrid enzyme, Ubx-FN.
  • To explore the potential applications of engineered hybrid enzymes in large-scale genome analysis.

Main Methods:

  • Construction and purification of the chimeric Ubx-FN enzyme.
  • Characterization of DNA cleavage activity using specific DNA substrates.

Related Experiment Videos

  • Analysis of DNA sequence-binding preference based on the Ubx homeodomain.

    • Main Results:

    • The hybrid Ubx-FN enzyme exhibited DNA sequence-binding specificity dictated by the Ubx homeodomain.
    • Cleavage occurred at sites distinct from the DNA recognition sequence, as predicted.
    • Specific cleavage patterns were observed on both strands of the target DNA.

    Conclusions:

    • Engineered chimeric restriction endonucleases can combine novel DNA-binding specificities with catalytic activity.
    • The Ubx-FN hybrid enzyme demonstrates the feasibility of creating custom DNA-cutting tools.
    • Such engineered enzymes hold promise as valuable tools for physical mapping and sequencing of complex eukaryotic genomes.