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Related Concept Videos

Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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IR Frequency Region: Fingerprint Region01:03

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy
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Protocol for determining protein dynamics using FT-IR spectroscopy.

Hao Shen1, Cuiping Fu2, Junting Zhang2

  • 1Institute of Mass Spectrometry, School of Material Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, China; State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Ningbo University, Ningbo, 315211, China.

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|December 3, 2023
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Summary
This summary is machine-generated.

This study introduces a Fourier-transform infrared (FT-IR) spectroscopy protocol to measure protein dynamics using amide hydrogen/deuterium (H/D) exchange. This method helps analyze how mutations or interactions affect protein H/D exchange rates.

Keywords:
BiophysicsProtein BiochemistryStructural Biology

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Area of Science:

  • Biochemistry
  • Spectroscopy
  • Structural Biology

Background:

  • Protein function is intrinsically linked to dynamic structural changes.
  • Protein dynamics are crucial for biological processes and can be investigated using amide hydrogen/deuterium (H/D) exchange.
  • Amide H/D exchange is a powerful technique for probing protein flexibility and conformational landscapes.

Purpose of the Study:

  • To present a detailed protocol for assessing protein dynamics.
  • To establish a method utilizing Fourier-transform infrared (FT-IR) spectroscopy for H/D exchange analysis.
  • To provide a framework for studying the impact of various factors on protein dynamics.

Main Methods:

  • Sample preparation for proteins.
  • Fourier-transform infrared (FT-IR) spectra collection.
  • Detailed analysis procedures for FT-IR spectra to quantify H/D exchange.

Main Results:

  • The protocol enables the determination of protein dynamics via FT-IR spectroscopy.
  • The method allows for the quantitative assessment of H/D exchange rates.
  • The study outlines the practical steps for implementing this technique.

Conclusions:

  • The presented FT-IR spectroscopy protocol offers a robust method for studying protein dynamics.
  • This technique is applicable to investigating the effects of mutations, metal ions, and ligand interactions on protein H/D exchange.
  • The protocol facilitates a deeper understanding of structure-function relationships in biological systems.