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Related Experiment Videos

The specificity of lambda exonuclease. Interactions with single-stranded DNA.

K S Sriprakash, N Lundh, Huh MM-O

    The Journal of Biological Chemistry
    |July 25, 1975
    PubMed
    Summary
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    Lambda exonuclease efficiently degrades DNA from the 5' terminus. Its interaction with single-stranded DNA and inhibition by double-stranded DNA are characterized, offering insights into its role in genetic recombination.

    Area of Science:

    • Molecular Biology
    • Enzymology
    • Genetics

    Background:

    • Lambda exonuclease is an enzyme involved in genetic recombination.
    • It is known to degrade native DNA processively from the 5' terminus.

    Purpose of the Study:

    • To investigate the interactions of lambda exonuclease with single-stranded DNA.
    • To characterize the enzyme's degradation rates and binding affinities for various DNA structures.

    Main Methods:

    • Enzymatic digestion assays using native and single-stranded DNA substrates.
    • Analysis of enzyme kinetics and binding affinities.
    • Investigating the effect of DNA length and structure on enzyme activity.

    Main Results:

    • Digestion rate of single-stranded DNA is inversely related to chain length.

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  • Enzyme affinity for single strands also decreases with increasing chain length.
  • Lambda exonuclease activity on double-stranded DNA is partially inhibited by single-stranded DNA and can be sterically blocked by long 3'-terminal single strands.

    • Conclusions:

    • Lambda exonuclease exhibits distinct interaction patterns with single-stranded DNA, influencing its degradation efficiency.
    • Understanding these properties is crucial for both practical applications and elucidating its function in genetic recombination.