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Related Experiment Videos

Chaperones in bacteriophage T4 assembly

E I Marusich1, L P Kurochkina, V V Mesyanzhinov

  • 1Bakh Institute of Biochemistry, Russian Academy of Sciences, Leninskii pr. 33, Moscow, 117071 Russia.

Biochemistry. Biokhimiia
|April 29, 1998
PubMed
Summary

Bacteriophage T4 chaperones, including gp31, gp40, gp38, gp57A, and fibritin, are crucial for viral protein folding and assembly. These virus-specific proteins aid in capsid formation and tail fiber construction, offering insights into protein folding mechanisms.

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Area of Science:

  • Molecular Biology
  • Virology
  • Structural Biology

Background:

  • Cellular protein folding relies on chaperones and enzymes like protein disulfide isomerase and peptidyl prolyl cis-trans isomerase.
  • Chaperones stabilize folding intermediates and aid in supramolecular assembly and disaggregation.
  • Bacteriophage T4 provides a valuable model for studying protein folding due to its encoded virus-specific chaperones.

Purpose of the Study:

  • To review the roles of bacteriophage T4 chaperones in viral protein folding and assembly.
  • To highlight specific T4 chaperones involved in capsid formation and tail fiber assembly.
  • To discuss the potential of T4 chaperones as models for understanding general protein folding mechanisms.

Main Methods:

  • Review of existing literature on bacteriophage T4 chaperones.

Related Experiment Videos

  • Analysis of the functions of specific T4-encoded chaperones (gp31, gp40, gp38, gp57A, fibritin).
  • Comparison of T4 chaperones with host cell and eukaryotic counterparts.

    • Main Results:

    • Phage T4 gene 31 protein (gp31) substitutes for host GroES in folding the major capsid protein (gp23) with GroEL.
    • Phage T4 gene 40 protein aids in the assembly of gp20 and procapsid connector formation.
    • Phage T4 gene 57A protein is essential for folding and oligomerization of tail fibers; gp38 participates in distal long fiber formation.
    • Fibritin (wac gene product) assembles long tail fiber subunits and serves as a model for fibrous protein folding.

    Conclusions:

    • Bacteriophage T4 encodes multiple specialized chaperones that are essential for viral structural protein folding and assembly.
    • These T4 chaperones, such as gp31, gp40, gp57A, gp38, and fibritin, play distinct roles in capsid and tail fiber formation.
    • The study of T4 chaperones offers significant insights into fundamental mechanisms of protein folding, oligomerization, and supramolecular assembly.