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Published on: June 19, 2018
A newly designed microspectrofluorometer for kinetic studies on protein crystals in combination with x-ray
Björn U Klink1, Roger S Goody, Axel J Scheidig
1Max-Planck-Institut für Molekulare Physiologie, Abteilung Physikalische Biochemie, D-44225 Dortmund, Germany.
Biophysical Journal
|May 16, 2006
Summary
We developed FLUMIX (Fluorescence spectroscopy to monitor intermediates in x-ray crystallography), a novel fluorescence microspectrophotometer. This versatile device enables real-time monitoring of crystal reactions during X-ray diffraction experiments.
Area of Science:
- Biophysics
- Crystallography
- Spectroscopy
Background:
- Kinetic crystallography requires monitoring reaction intermediates.
- Conventional fluorometers have limitations in space and versatility.
Purpose of the Study:
- Introduce FLUMIX, a new fluorescence microspectrophotometer for kinetic crystallography.
- Demonstrate its advantages over traditional 90-degree fluorometers.
- Showcase its utility in studying protein dynamics.
Main Methods:
- Designed FLUMIX for 0-degree fluorescence detection.
- Integrated FLUMIX with a stereomicroscope for direct measurements.
- Utilized H-Ras p21 with caged GTP and a fluorophore as a model system.
- Combined FLUMIX with synchrotron X-ray diffraction.
Main Results:
- FLUMIX offers reduced spatial needs and high versatility.
- Real-time fluorescence measurements were performed on H-Ras p21 crystals.
- Significant fluorescence changes were observed within seconds of X-ray exposure.
Conclusions:
- FLUMIX is a versatile tool for kinetic crystallography.
- It provides detailed insights into photolyzed crystal states.
- FLUMIX facilitates rapid monitoring of X-ray-induced changes in protein crystals.
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