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Isolation of viral coat protein mutants with altered assembly and aggregation properties

D S Peabody1, L Al-Bitar

  • 1Department of Molecular Genetics and Microbiology, University of New Mexico School of Medicine, Albuquerque, NM 87131, USA. dpeabody@salud.unm.edu

Nucleic Acids Research
|November 20, 2001
PubMed

Insights

A new screening method uses bacteriophage MS2 coat protein to identify bacterial mutations affecting protein assembly and solubility. This technique aids in isolating defective mutants and finding soluble protein variants.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Engineering

Background:

  • Bacterial protein expression is crucial for biotechnology.
  • Understanding protein self-assembly and solubility is key to protein engineering.
  • Bacteriophage MS2 coat protein serves as a model for self-associating proteins.

Purpose of the Study:

  • To develop a novel screening method for identifying bacterial mutants with altered protein assembly and solubility.
  • To utilize bacteriophage MS2 coat protein as a model system for this screening method.
  • To isolate assembly-defective mutants and soluble variants of aggregation-prone proteins.

Main Methods:

  • A method involving agarose overlay on bacterial colonies expressing MS2 coat protein was developed.
  • Cell lysis released proteins, which diffused through the overlay based on molecular size.
  • Proteins were transferred to a membrane and detected using specific antiserum to assess aggregation state.

Main Results:

  • The screening method successfully identified spots related to the aggregation state of MS2 coat protein.
  • The technique was effective in isolating assembly-defective mutants.
  • Soluble variants of an aggregation-prone coat protein mutant were successfully identified.

Conclusions:

  • The developed method provides an effective means to screen for bacterial protein synthesis with altered assembly and solubility.
  • This technique is valuable for protein engineering and the study of self-associating proteins.
  • The MS2 coat protein model system demonstrates the utility of this screening approach.

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