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Trace fluorescent labeling for high-throughput crystallography.

Elizabeth Forsythe1, Aniruddha Achari, Marc L Pusey

  • 1Nektar Therapeutics, Huntsville, AL 35806, USA.

Acta Crystallographica. Section D, Biological Crystallography
|March 3, 2006
PubMed
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Covalent labeling of proteins with fluorescent dyes aids crystal detection in X-ray crystallography. Trace levels of labeling do not significantly impact diffraction data quality, simplifying crystal identification.

Area of Science:

  • Biophysics
  • Crystallography
  • Biochemistry

Background:

  • Crystallization is crucial for X-ray diffraction studies of macromolecules.
  • Identifying small or obscured crystals in crystallization drops can be challenging.
  • Fluorescent labeling offers a potential method for enhanced crystal detection.

Purpose of the Study:

  • To investigate the feasibility of using trace levels of fluorescently labeled proteins for crystal detection.
  • To assess the impact of fluorescent labeling on X-ray diffraction data quality.
  • To determine optimal labeling concentrations for effective crystal identification.

Main Methods:

  • Proteins (insulin, ribonuclease, lysozyme, thaumatin) were covalently labeled with carboxyrhodamine.
  • Labeling occurred at N-terminal amines and, for lysozyme, randomly on lysine side chains.

Related Experiment Videos

  • X-ray diffraction data quality was analyzed at various labeled protein concentrations (up to 10%).
  • Visual inspection and screening experiments were performed to evaluate crystal detection efficacy.

    • Main Results:

    • Well-formed crystals were obtained for thaumatin and randomly labeled lysozyme up to 10% label concentration.
    • Fluorescent labeling did not significantly affect X-ray diffraction data quality across tested concentrations.
    • Optimal derivatization levels for visual detection ranged from 0.025% to 0.25% depending on the protein.
    • Trace labeling (0.5%) proved effective for rapid crystal finding, even with precipitate presence.

    Conclusions:

    • Covalent fluorescent labeling is a viable technique for facilitating crystal detection in X-ray crystallography.
    • Trace labeling enhances crystal visibility under fluorescent illumination, simplifying detection.
    • This method aids both visual and automated crystal identification and centering in X-ray beamlines.