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Structural Polymorphs of Self-Assembled Brome Mosaic Virus Capsid Protein.

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Area of Science:

  • Virology
  • Structural Biology
  • Biochemistry

Background:

  • Brome Mosaic Virus (BMV), Cowpea Chlorotic Mottle Virus (CCMV), and Tobacco Mosaic Virus (TMV) can be reconstituted from purified RNA and capsid protein (CP).
  • CCMV and TMV capsid proteins have been extensively studied for self-assembly polymorphs across various pH and ionic strengths.
  • Understanding viral self-assembly is crucial for developing novel biotechnological applications.

Purpose of the Study:

  • To map the polymorph distribution of Brome Mosaic Virus (BMV) capsid protein self-assemblies.
  • To elucidate the types of quaternary structures formed by BMV capsid proteins.
  • To investigate the influence of pH/ionic strength history on BMV polymorph formation and reversibility.

Main Methods:

  • Utilized electron microscopy to visualize self-assembled structures.
  • Employed atomic force microscopy (AFM) to analyze quaternary structures.
  • Systematically varied pH and ionic strength conditions to study polymorph distribution.

Main Results:

  • Identified spherical, rodlike, and sheet-like polymorphs of BMV capsid protein assemblies.
  • Demonstrated that polymorph formation is independent of pH/ionic strength path history.
  • Showcased the reversible interconversion between different self-assembled polymorphs.

Conclusions:

  • BMV capsid proteins exhibit diverse self-assembly capabilities, forming distinct quaternary structures.
  • The self-assembly process is robust, unaffected by the history of environmental conditions.
  • Reversibility of polymorphs offers potential for controlled nanomaterial design and viral vector development.