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Prefractionation techniques in proteome analysis.

Pier Giorgio Righetti1, Annalisa Castagna, Ben Herbert

  • 1Department of Agricultural and Industrial Biotechnologies, University of Verona, Strada Le Grazie no. 15, I-37134 Verona, Italy. righetti@sci.univr.it

Proteomics
|August 19, 2003
PubMed
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This review explores prefractionation techniques in chromatography and electrophoresis to enhance two-dimensional map analysis. These methods reveal hundreds of previously undetected species, expanding proteome analysis.

Area of Science:

  • Proteomics
  • Analytical Chemistry
  • Biochemistry

Background:

  • Two-dimensional map analysis is crucial for comprehensive proteome studies.
  • Many low-abundance or low-expression proteins remain undetected in unfractionated samples.
  • Prefractionation is essential to overcome the dynamic range limitations of current proteomic techniques.

Purpose of the Study:

  • To review and present various prefractionation protocols for two-dimensional map analysis.
  • To highlight the utility of chromatographic and electrophoretic methods for sample enrichment.
  • To discuss instruments and techniques for accessing the "unseen proteome".

Main Methods:

  • Chromatographic prefractionation: affinity, ion-exchange, and reversed-phase resins.
  • Electrophoretic prefractionation: isoelectric focusing-based methods in free solution.

Related Experiment Videos

  • Reviewed instruments: multicompartment electrolyzer, Off-Gel electrophoresis, Rotofor, Octopus, and Gradiflow.

    • Main Results:

    • Prefractionation significantly increases the number of detectable protein species.
    • Several hundred new species were revealed in previously unfractionated samples.
    • Various chromatographic and electrophoretic techniques effectively enrich complex biological samples.

    Conclusions:

    • Prefractionation protocols are vital for advancing proteomic research.
    • The reviewed methods offer powerful tools for "mining below the tip of the iceberg".
    • These techniques enable the detection of the "unseen proteome" and provide deeper biological insights.