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Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates
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Versatile Vibrational Energy Sensors for Proteins.

Jan G Löffler1, Erhan Deniz1, Carolin Feid1

  • 1Institute of Biophysics, Goethe University Frankfurt, Max-von-Laue-Straße 1, 60438, Frankfurt (Main), Germany.

Angewandte Chemie (International Ed. in English)
|February 28, 2022
PubMed
Summary

Vibrational energy transfer (VET) in proteins is crucial for function. Researchers compared IR labels for VET sensing, finding interchangeable utility across various systems and solvents.

Keywords:
Non-Canonical Amino AcidsProtein DynamicsProtein ModificationsTime-Resolved SpectroscopyVibrational Energy Transfer

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Area of Science:

  • Biophysics
  • Spectroscopy
  • Protein Dynamics

Background:

  • Vibrational energy transfer (VET) is increasingly recognized for its role in protein functions like energy dissipation, allosteric regulation, and enzyme catalysis.
  • Understanding VET mechanisms is essential for elucidating these protein functions.
  • Ultrafast VIS-pump/IR-probe spectroscopy is a key technique for studying VET pathways in proteins.

Purpose of the Study:

  • To expand the applicability of VET studies in proteins by evaluating the utility of six different infrared (IR) labels as VET sensors.
  • To assess the suitability of these IR labels in both simple dipeptide models and complex protein systems.

Main Methods:

  • Comparative analysis of six IR labels based on their Fourier-transform infrared (FTIR) and VET signatures in dipeptide models dissolved in various solvents.
  • Incorporation of four selected IR labels into the PDZ3 protein to evaluate their performance in a more complex biological environment.

Main Results:

  • The study demonstrated that different IR labels exhibit interchangeable utility as VET sensors.
  • The choice of IR label can be flexible, depending on the specific protein system and available experimental methods.
  • FTIR and VET signatures were analyzed to characterize label performance.

Conclusions:

  • The findings provide flexibility in selecting IR labels for VET studies in proteins.
  • This interchangeability broadens the scope of proteins and sites amenable to VET investigation.
  • Researchers can now choose the optimal IR label based on their specific experimental needs and system under study.