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Related Concept Videos

Detergent Purification of Membrane Proteins01:18

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Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
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Related Experiment Video

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Glycopeptide Capture for Cell Surface Proteomics
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Extraction, Enrichment, Solubilization, and Digestion Techniques for Membrane Proteomics.

Stephanie M Moore1, Stephanie M Hess1, James W Jorgenson1

  • 1Chemistry Department University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States.

Journal of Proteome Research
|March 17, 2016
PubMed
Summary

This study presents an improved workflow for analyzing membrane proteins in yeast, increasing identifications by 26%. The optimized method enhances solubilization and digestion for better proteomic analysis of these challenging biological molecules.

Keywords:
Saccharomyces cerevisiaemembrane proteinssample preparation techniquessodium deoxycholatesonication

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Cell-Free Production of Proteoliposomes for Functional Analysis and Antibody Development Targeting Membrane Proteins
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Area of Science:

  • Proteomics
  • Biochemistry
  • Cell Biology

Background:

  • Membrane proteins are crucial in biological systems but challenging to study due to their amphipathic nature.
  • Existing techniques for membrane protein analysis often face limitations in efficiency and scope.
  • Saccharomyces cerevisiae (baker's yeast) serves as a model organism for studying fundamental cellular processes.

Purpose of the Study:

  • To compare popular techniques for membrane protein extraction, enrichment, solubilization, and digestion.
  • To develop an improved workflow for analyzing the insoluble fraction of Saccharomyces cerevisiae cell lysate.
  • To enhance the identification and quantification of membrane proteins in yeast.

Main Methods:

  • Yeast cells were lysed using a French press at 20,000 psi.
  • Proteins were fractionated to reduce sample complexity before digestion.
  • Optimal solubilization was achieved using 1% sodium deoxycholate and high-frequency sonication.
  • Tryptic digestion was performed at 37 °C.

Main Results:

  • The improved workflow resulted in a 26% increase in membrane protein identifications in baker's yeast.
  • A higher number of unique membrane protein identifications were obtained with the improved protocol.
  • 93% of identified membrane proteins showed greater abundance (higher intensity) using the improved method compared to the standard operating procedure.

Conclusions:

  • The developed workflow significantly enhances the analysis of membrane proteins from Saccharomyces cerevisiae.
  • This optimized method improves the depth and accuracy of membrane proteomic studies.
  • The findings provide a more robust approach for investigating the roles of membrane proteins in cellular functions.