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Related Experiment Videos

Protein-labeling effects in confocal laser scanning microscopy.

Christopher A Teske1, Magnus Schroeder, Robert Simon

  • 1Institut für Biotechnologie 2, Forschungszentrum Jülich, Jülich 52425, Germany.

The Journal of Physical Chemistry. B
|July 21, 2006
PubMed
Summary

Fluorescent probes used in confocal laser scanning microscopy (CLSM) can alter protein binding in chromatography resins. This study shows probe identity affects protein adsorption profiles, impacting prior observations of protein transport mechanisms.

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Area of Science:

  • Biophysical Chemistry
  • Chromatography Science
  • Microscopy Techniques

Background:

  • Confocal laser scanning microscopy (CLSM) is increasingly used to study protein uptake in chromatography resins.
  • Previous CLSM studies suggest non-diffusive protein transport mechanisms may exist.
  • Protein observation via CLSM necessitates labeling with fluorescent probes.

Purpose of the Study:

  • To investigate the impact of fluorescent probe identity on protein adsorption profiles observed using CLSM.
  • To determine if fluorescent labeling affects the binding behavior of proteins in chromatography.

Main Methods:

  • Lysozyme was conjugated with various fluorescent probes (Cy5, BODIPY FL, Atto 635, Atto 520).
  • Adsorption of lysozyme-dye conjugates on SP Sepharose Fast Flow was analyzed using CLSM.

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  • Zonal chromatography experiments were conducted to validate CLSM findings and measure retention times.

    • Main Results:

    • Zonal chromatography revealed significant differences in retention times between lysozyme-dye conjugates and unlabeled lysozyme.
    • Changes in lysozyme retention correlated with alterations in net charge due to dye conjugation.
    • CLSM adsorption profiles varied based on whether the conjugate was retained longer or shorter than unlabeled lysozyme.

    Conclusions:

    • The identity of the fluorescent probe significantly influences protein adsorption behavior in chromatography.
    • Observed protein concentration overshoots in prior CLSM studies may be artifacts caused by probe-induced binding changes.
    • These findings highlight the importance of considering probe effects when interpreting CLSM data for protein transport studies.