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Protein Folding01:22

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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
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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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ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...
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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
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Thermodynamics of Membrane Protein Folding Measured by Fluorescence Spectroscopy
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Energetics-based methods for protein folding and stability measurements.

M Ariel Geer1, Michael C Fitzgerald

  • 1Department of Chemistry, Duke University, Durham, North Carolina 27708-0346;

Annual Review of Analytical Chemistry (Palo Alto, Calif.)
|June 5, 2014
PubMed
Summary

Energetics-based techniques like SUPREX and SPROX analyze protein folding and stability. These methods enable high-throughput screening for drug discovery and understanding drug mechanisms.

Keywords:
mass spectrometryprotein H/D exchangeprotein foldingproteomicsthermodynamics

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Area of Science:

  • Biochemistry
  • Biophysics
  • Structural Biology

Background:

  • Energetics-based techniques have advanced protein folding and stability analysis over 15 years.
  • Key methods include Stability of Unpurified Proteins from Rates of amide H/D Exchange (SUPREX) and Stability of Proteins from Rates of Oxidation (SPROX).

Purpose of the Study:

  • To review energetics-based techniques for thermodynamic analysis of protein folding and stability.
  • To highlight their application in analyzing protein-ligand complexes.

Main Methods:

  • Utilizing chemical or enzymatic modification reactions to probe protein unfolding.
  • Employing mass spectrometry, SDS-PAGE, and optical spectroscopy for analysis.
  • Leveraging techniques such as SUPREX, pulse proteolysis, SPROX, and quantitative cysteine reactivity (QCR).

Main Results:

  • These methods provide thermodynamic insights into protein folding and stability.
  • Readouts are advantageous for high-throughput and multiplexed analyses.
  • Enabled new applications in identifying protein ligands and mode-of-action studies.

Conclusions:

  • Energetics-based techniques offer powerful tools for protein stability assessment.
  • Their high-throughput nature facilitates drug discovery and target identification.
  • These methods are crucial for understanding protein behavior and interactions.