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Spatial Separation of Molecular Conformers and Clusters
Published on: January 9, 2014
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Spatially Separating the Conformers of a Dipeptide
Nicole Teschmit1,2,3, Daniel A Horke1,2, Jochen Küpper1,2,3,4
1Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607, Hamburg, Germany.
Angewandte Chemie (International Ed. in English)
|August 15, 2018
Summary
Researchers created ultra-cold peptide beams, separating different molecular shapes. This breakthrough enables conformer-specific chemistry and advances atomic-resolution imaging of single biological molecules.
Area of Science:
- Physical Chemistry
- Molecular Biophysics
- Spectroscopy
Background:
- Atomic-resolution imaging of single molecules, like coherent X-ray diffraction, requires beams of identical molecules.
- Biomolecular beams, even when cold, often contain multiple conformational states, hindering precise analysis.
- Current techniques struggle to isolate specific molecular conformations for detailed study.
Purpose of the Study:
- To produce rotationally very cold molecular beams of intact dipeptide molecules.
- To spatially separate these molecules into their individual populated conformational states.
- To enable conformer-specific chemical investigations and advance single-molecule structural imaging.
Main Methods:
- Utilized supersonic expansion laser-desorption vaporization to generate molecular beams.
- Employed electrostatic deflection in strong inhomogeneous fields for spatial separation.
- Achieved rotational temperatures of approximately 2.3 Kelvin (Trot ≈2.3 K).
Main Results:
- Successfully produced intact dipeptide molecular beams with very low rotational temperatures.
- Demonstrated the spatial separation of molecules into distinct conformational states.
- Established the first conformer-separated, rotationally cold molecular beam of a peptide.
Conclusions:
- This method enables conformer-specific chemistry investigations using techniques not inherently sensitive to conformation.
- Represents a significant milestone towards direct atomic-resolution structural imaging of individual biological molecules.
- Paves the way for ultrafast diffractive-imaging methods applied to complex biomolecules.
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