Journal of Protein Chemistry

, Volume 18, Issue 2, pp 225–231 | Cite as

Preparative High-Resolution Two-Dimensional Electrophoresis Enables the Identification of RNA Polymerase B Transcription Factor 3 as an Apoptosis-Associated Protein in the Human BL60–2 Burkitt Lymphoma Cell Line

  • Ekkehard Brockstedt
  • Albrecht Otto
  • Anke Rickers
  • Kurt Bommert
  • Brigitte Wittmann-Liebold


Apoptosis or programmed cell death is essential in the process of controlling lymphocyte growth and selection. We identified RNA polymerase B transcription factor 3 (BTF3), which is associated with anti-IgM antibody-mediated apoptosis, using a subclone of the human Burkitt lymphoma cell line BL60. To identify the transcription factor BTF3, which is expressed only in minor amounts, we used preparative high-resolution two-dimensional gel electrophoresis (2DE) employing carrier ampholytes for isoelectric focusing. Comparison of the 2DE protein patterns from apoptotic and nonapoptotic cells showed BTF3 as a predominantly altered protein spot. The characterization of the differentially expressed transcription factor and 13 marker proteins described in this study were performed by internal Edman microsequencing and/or by peptide mass fingerprinting using matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS). The proteome analysis was significantly improved by performing the newly developed preparative high-resolution two-dimensional gels employing high protein concentrations.

Two-dimensional electrophoresis MALDI-MS apoptosis RNA polymerase B transcription factor 3 


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Copyright information

© Plenum Publishing Corporation 1999

Authors and Affiliations

  • Ekkehard Brockstedt
    • 1
  • Albrecht Otto
    • 1
  • Anke Rickers
    • 1
  • Kurt Bommert
    • 1
  • Brigitte Wittmann-Liebold
    • 1
  1. 1.Max-Delbrück-Center for Molecular MedicineBerlinGermany

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