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Related Experiment Videos

The inverted repeat as a recognizable structural feature in supercoiled DNA molecules.

D M Lilley

    Proceedings of the National Academy of Sciences of the United States of America
    |November 1, 1980
    PubMed
    Summary
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    Aspergillus oryzae's single-strand-specific endonuclease S1 enzyme precisely cuts supercoiled DNA at specific inverted repeat sequences. This enzyme’s targeted DNA cleavage highlights potential recognition sites for cellular proteins.

    Area of Science:

    • Molecular Biology
    • Enzymology
    • Genetics

    Background:

    • Supercoiled DNA plays a crucial role in various cellular processes.
    • Endonucleases are enzymes that cleave DNA strands.
    • Aspergillus oryzae is a fungus known for producing various enzymes.

    Purpose of the Study:

    • To investigate the cleavage specificity of the single-strand-specific endonuclease S1 from Aspergillus oryzae.
    • To identify the DNA sequence and structural features recognized by endonuclease S1.
    • To explore the potential biological significance of these recognition sites.

    Main Methods:

    • Treatment of supercoiled and linearized covalently closed circular DNA with purified endonuclease S1.
    • Analysis of DNA cleavage products using gel electrophoresis.

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  • Sequencing and structural analysis of identified cleavage sites.

    • Main Results:

    • Endonuclease S1 selectively cleaved supercoiled DNA but not linearized DNA.
    • Cleavage occurred at inverted repeat sequences of 9-13 base pairs, separated by 2-6 non-repetitive base pairs.
    • These specific DNA regions may form hairpin structures stabilized by superhelix density.

    Conclusions:

    • Endonuclease S1 exhibits high specificity for supercoiled DNA structures containing inverted repeats.
    • The identified cleavage sites represent potential recognition motifs for cellular proteins.
    • This enzyme's activity provides insights into DNA-protein interactions and DNA structural recognition.