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Structural, functional, and evolutionary relationships between lambda-exonuclease and the type II restriction

R A Kovall1, B W Matthews

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

Proceedings of the National Academy of Sciences of the United States of America
|July 8, 1998
PubMed
Summary
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Lambda-exonuclease, crucial for DNA repair, degrades DNA strands. Structural analysis reveals similarities to restriction enzymes, suggesting a shared evolutionary origin and mechanism.

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Enzymology

Background:

  • Lambda-exonuclease is involved in DNA recombination and repair pathways.
  • The enzyme functions by binding to double-stranded DNA ends and degrading one strand in the 5' to 3' direction.
  • Its primary sequence shows no homology to other known proteins.

Purpose of the Study:

  • To investigate the structural characteristics of lambda-exonuclease.
  • To compare its structure with other DNA-modifying enzymes.
  • To elucidate the catalytic mechanism and evolutionary relationships of lambda-exonuclease.

Main Methods:

  • X-ray crystallography was used to determine the three-dimensional structure of lambda-exonuclease.
  • Structural comparisons were performed against databases of known protein structures, including restriction endonucleases.

Related Experiment Videos

  • Functional implications of the structural findings were analyzed.

    • Main Results:

    • The crystal structure of lambda-exonuclease revealed partial similarity to type II restriction endonucleases such as PvuII and EcoRV.
    • Weaker structural correspondences were observed with other restriction enzymes, including EcoRI, BamHI, and Cfr10I.
    • The enzyme's toroidal structure, which encircles the DNA substrate, was strongly supported by structural evidence.

    Conclusions:

    • Lambda-exonuclease, PvuII, EcoRV, EcoRI, BamHI, and Cfr10I likely share a common structural ancestor and a similar catalytic mechanism.
    • The toroidal fold of lambda-exonuclease is integral to its DNA hydrolysis function.
    • Structural insights provide a basis for understanding the enzyme's role in DNA metabolism.