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The proteome of the bacterium Mycoplasma pneumoniae: comparing predicted open reading frames to identified gene

Barbara Ueberle1, Rainer Frank, Richard Herrmann

  • 1Zentrum für Molekulare Biologie, Universität Heidelberg, Heidelberg, Germany.

Proteomics
|July 12, 2002
PubMed

Insights

This study expands the Mycoplasma pneumoniae proteome map to 305 genes, identifying novel proteins using advanced enrichment and mass spectrometry techniques. It also reveals limitations in 2-D gel electrophoresis for certain protein types.

Area of Science:

  • Microbiology
  • Proteomics
  • Genomics

Background:

  • The Mycoplasma pneumoniae proteome map was previously established for 224 genes.
  • Understanding the full proteome is crucial for bacterial research.

Purpose of the Study:

  • To extend the existing proteome map of Mycoplasma pneumoniae.
  • To identify and characterize newly assigned gene products.
  • To analyze the relationship between protein properties and 2-D gel electrophoresis separation.

Main Methods:

  • Protein enrichment using differential centrifugation, ion exchange chromatography, and affinity chromatography.
  • Separation of proteins via one-dimensional and two-dimensional (2-D) gel electrophoresis.
  • Identification of proteins using mass spectrometry.

Main Results:

  • The proteome map was extended to include proteins from 305 genes, representing 44% of the genome's open reading frames (ORFs).
  • Proteins with >3 transmembrane segments and pI > 10.5 are challenging to separate by 2-D gel electrophoresis.
  • An unannotated 128 amino acid protein was identified, highlighting the synergy between genomics and proteomics.

Conclusions:

  • The expanded proteome map provides a more comprehensive view of Mycoplasma pneumoniae.
  • Specific protein characteristics influence their detectability in 2-D gel electrophoresis.
  • Integrated genomics and proteomics approaches are valuable for bacterial genome annotation.

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