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Related Experiment Videos

Domain structure of gpNu1, a phage lambda DNA packaging protein.

Q Yang1, N Berton, M C Manning

  • 1Department of Pharmaceutical Sciences, Molecular Biology Program, University of Colorado Health Sciences Center, Denver 80262, USA.

Biochemistry
|November 26, 1999
PubMed
Summary
This summary is machine-generated.

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Bacteriophage lambda terminase subunit gpNu1's C-terminal 40 amino acids are crucial for specific DNA binding and proper holoenzyme assembly. This study characterizes a gpNu1 mutant lacking these residues, revealing their essential role in function.

Area of Science:

  • Molecular Biology
  • Virology
  • Biochemistry

Background:

  • The terminase enzyme complex, comprising gpA and gpNu1 subunits, is essential for bacteriophage lambda's DNA packaging into viral capsids.
  • Previous research identified functional domains within gpNu1, including DNA binding, self-association, and gpA interaction regions, but lacked detailed biochemical characterization.

Purpose of the Study:

  • To biochemically characterize a deletion mutant of gpNu1 (gpNu1ΔP141) lacking the C-terminal 40 amino acids.
  • To investigate the role of these C-terminal residues in gpNu1's DNA binding, self-association, and interaction with the gpA subunit.

Main Methods:

  • Cloning, expression, and purification of the gpNu1ΔP141 mutant.
  • Circular dichroism (CD) and fluorescence spectroscopy to assess protein folding and stability.

Related Experiment Videos

  • Analysis of protein aggregation, subunit interactions, and DNA binding affinity and specificity.

    • Main Results:

    • gpNu1ΔP141 retains DNA binding and self-association capabilities but exhibits weak interaction with gpA and fails to form a functional holoenzyme.
    • The C-terminal 40 residues are essential for specific DNA binding and proper gpA subunit interaction.
    • Spectroscopic studies confirmed that the DNA binding and self-association domains are independent folding units.

    Conclusions:

    • The C-terminal 40 amino acids of gpNu1 are critical for specific DNA recognition and the formation of a catalytically active terminase holoenzyme.
    • These residues mediate essential interactions with the gpA subunit, ensuring correct assembly and function.