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Related Concept Videos

Protein-protein Interfaces02:04

Protein-protein Interfaces

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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
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Real Time Measurements of Membrane Protein:Receptor Interactions Using Surface Plasmon Resonance SPR
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Protein Interaction Analysis by Surface Plasmon Resonance.

Dennis G Drescher1, Marian J Drescher2

  • 1Departments of Otolaryngology and Biochemistry-Molecular Biology, Wayne State University School of Medicine, Detroit, MI, USA. ddresche@med.wayne.edu.

Methods in Molecular Biology (Clifton, N.J.)
|April 24, 2023
PubMed
Summary
This summary is machine-generated.

Surface Plasmon Resonance (SPR) is a label-free optical method for detecting molecular interactions, particularly protein-protein binding. This technique offers high sensitivity for analyzing small protein quantities without altering molecular properties.

Keywords:
Biacore 3000CM5 sensor chipFusion proteinGel electrophoresisInteraction kineticsMolecular cloningProtein-protein interactionSurface plasmon resonance (SPR)Western blotting

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Area of Science:

  • Biophysical Chemistry
  • Molecular Biology
  • Analytical Chemistry

Background:

  • Surface Plasmon Resonance (SPR) is a label-free optical detection method.
  • It is widely used for real-time monitoring of biomolecular interactions.
  • SPR relies on changes in refractive index near a metal surface.

Purpose of the Study:

  • To provide practical methodologies for performing Surface Plasmon Resonance (SPR) analysis.
  • To highlight the advantages of SPR in studying molecular interactions.
  • To detail the principles of SPR for detecting direct protein-protein interactions.

Main Methods:

  • SPR utilizes polarized light impinging on a thin metal film.
  • Changes in the refractive index, caused by analyte-ligand binding, alter the angle of light extinction.
  • The resonance phenomenon is monitored as a dip in reflected light intensity.

Main Results:

  • SPR strictly detects mass, eliminating the need for labeling interacting components.
  • This label-free nature prevents alterations in molecular properties.
  • The technique demonstrates high sensitivity, suitable for analyzing small protein amounts.

Conclusions:

  • SPR is a powerful and sensitive technique for studying molecular interactions, especially protein-protein binding.
  • Its label-free nature and high sensitivity make it ideal for analyzing small sample sizes.
  • This chapter focuses on the practical application and methodologies of SPR analysis.