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DNA Bacteriophages01:26

DNA Bacteriophages

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Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
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Phage Phenomics: Physiological Approaches to Characterize Novel Viral Proteins
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Phage Phenomics: Physiological Approaches to Characterize Novel Viral Proteins

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Phage-like packing structures with mean field sequence dependence.

Christopher G Myers1,2, B Montgomery Pettitt1,2

  • 1Program in Structural and Computational Biology and Molecular Biophysics, Baylor College of Medicine, Houston, Texas, 77030-3411.

Journal of Computational Chemistry
|March 29, 2017
PubMed
Summary
This summary is machine-generated.

Introducing DNA kinking in bacteriophages significantly reduces energy and pressure by enhancing local ordering. This defect model explains DNA packing challenges and structural data in viral capsids.

Keywords:
virusDNAsimulation

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Area of Science:

  • Biophysics
  • Structural Biology
  • Polymer Physics

Background:

  • Bacteriophage DNA packaging involves overcoming electrostatic repulsions and overcoming the DNA's inherent stiffness (persistence length).
  • Efficiently packing long, double-stranded DNA (dsDNA) into small viral capsids is a complex biophysical challenge.

Purpose of the Study:

  • To investigate the role of DNA kinking and disorder in the energetic and pressure profiles of DNA packaged within bacteriophages.
  • To explore how DNA's flexibility and local ordering influence the packing efficiency and stability of viral capsids.

Main Methods:

  • Utilized coarse-grained polymer models incorporating kinking ability and random disorder.
  • Simulated DNA configurations within spherical confinement, focusing on a kink model with deformation every 24 base pairs (bp).

Main Results:

  • Kinking significantly reduced overall energies and pressures of packaged DNA.
  • Introduction of kinking defects increased local nematic ordering of DNA segments, even with random packing.
  • Local ordering reduced both bending energy (nonlinear elasticity) and electrostatic energy/pressure.

Conclusions:

  • DNA kinking is a crucial factor in overcoming energetic barriers during phage DNA packaging.
  • The proposed kink model provides a consistent explanation for observed structural data and DNA configurations in viral systems.
  • Flexibility and local ordering, facilitated by kinking, are key to efficient and stable DNA packing in bacteriophages.