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Related Experiment Videos

Toroidal structure of lambda-exonuclease

R Kovall1, B W Matthews

  • 1Institute of Molecular Biology, Howard Hughes Medical Institute, and Department of Physics, University of Oregon, Eugene, OR 97403, USA.

Science (New York, N.Y.)
|September 20, 1997
PubMed
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Lambda-exonuclease, an enzyme crucial for DNA processing, has a toroid structure with a central channel. This structure explains its ability to efficiently degrade DNA strands.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • Lambda-exonuclease is a key enzyme involved in DNA metabolism.
  • Understanding its structure is essential for elucidating its function in DNA processing.

Purpose of the Study:

  • To determine the three-dimensional structure of lambda-exonuclease.
  • To provide a structural basis for its high processivity and substrate specificity.

Main Methods:

  • X-ray crystallography was used to determine the enzyme's structure.
  • High-resolution structure determination was performed at 2.4 angstroms.

Main Results:

  • Lambda-exonuclease forms a toroid structure composed of three subunits.

Related Experiment Videos

  • A funnel-shaped central channel, approximately 30 to 15 angstroms in diameter, was identified.
  • The structure suggests the location of active sites and constraints on DNA cleavage.

    • Conclusions:

    • The determined structure provides a molecular explanation for lambda-exonuclease's processive DNA hydrolysis.
    • The funnel-shaped channel accommodates the DNA substrate, enabling sequential nucleotide removal.
    • Structural insights offer a basis for understanding the enzyme's mechanism and substrate interaction.