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Related Experiment Videos

Structural mimicry in the phage phi21 N peptide-boxB RNA complex.

Christopher D Cilley1, James R Williamson

  • 1Department of Molecular Biology, The Scripps Research Institute, La Jolla, California 92037, USA.

RNA (New York, N.Y.)
|May 21, 2003
PubMed
Summary

The bacteriophage phi21 N protein peptide binds the boxB RNA hairpin via an alpha-helix. This interaction, crucial for antitermination, reveals structural similarities across related phage N peptide-boxB RNA complexes.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Bacteriophage N proteins are essential for transcriptional antitermination.
  • The boxB RNA hairpin is a key recognition element for N protein binding.
  • Understanding these interactions is vital for phage-host dynamics.

Purpose of the Study:

  • To determine the solution structure of the bacteriophage phi21 N protein peptide in complex with boxB RNA.
  • To elucidate the molecular basis of the interaction between the N peptide and boxB RNA.

Main Methods:

  • Heteronuclear magnetic resonance (MR) spectroscopy was employed.
  • Solution structure determination of the peptide-RNA complex.

Main Results:

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  • The 22-amino acid N peptide binds the 24-mer boxB RNA hairpin as an alpha-helix.
  • Binding occurs primarily in the major groove of the 5' half of the boxB RNA stem-loop.
  • The interaction interface is characterized by surface complementarity with polar and nonpolar interactions, not extensive sequence-specific recognition.
  • The phi21 boxB loop exhibits a U-turn motif and a C:C base pair closing the loop.
  • The complex shares structural similarities with related bacteriophage N peptide-boxB RNA complexes.

Conclusions:

  • The phi21 N peptide-boxB RNA complex adopts a structure facilitating interaction with Escherichia coli host factors.
  • Structural similarities among different phage complexes suggest a conserved mechanism for enabling antitermination.
  • This study provides insights into the molecular mechanisms of phage transcriptional regulation.