Related Experiment Video

Updated: Jul 17, 2026

Protein Complex Affinity Capture from Cryomilled Mammalian Cells
10:37

Protein Complex Affinity Capture from Cryomilled Mammalian Cells

Published on: December 9, 2016

Immunoaffinity purification of plasma membrane with secondary antibody superparamagnetic beads for proteomic analysis

Lijun Zhang1, Xi'e Wang, Xia Peng

  • 1Key Laboratory of Protein Chemistry and Developmental Biology of National Education Committee, College of Life Science, Hunan Normal University, Changsha 410081, PR China.

Journal of Proteome Research
|January 6, 2007
PubMed

Insights

This study introduces a novel method for purifying plasma membranes (PM) using superparamagnetic beads, significantly improving purity and reducing contamination. This technique offers a simple, economical, and reproducible tool for liver plasma membrane proteome analysis.

Area of Science:

  • Cell Biology
  • Proteomics
  • Biochemistry

Background:

  • Plasma membrane (PM) is crucial for cell-cell interactions and signal transduction, making it a key target for drug design.
  • Accurate proteomic analysis of the PM requires highly pure preparations, which are challenging to obtain using traditional methods like density gradient centrifugation due to internal membrane contamination.

Purpose of the Study:

  • To develop and optimize a novel method for plasma membrane purification using second antibody superparamagnetic beads.
  • To compare the efficiency of this new method against traditional density gradient centrifugation for liver plasma membrane isolation.

Main Methods:

  • Combined subcellular fractionation and immunoisolation strategies utilizing second antibody superparamagnetic beads.
  • Compared four immunoaffinity methods and optimized parameters including crude plasma membrane (CPM) quantity, bead concentration, and antibody amounts.
  • Proteomic analysis of purified PM using MALDI-TOF-TOF and ESI-Q-TOF mass spectrometry, with data analyzed by Mascot software against the IPI-mouse database.

Main Results:

  • The optimized superparamagnetic bead method achieved a 3-fold enrichment of mouse liver PM compared to density gradient centrifugation.
  • Mitochondrial contamination was reduced 2-fold using the new method.
  • Identified 248 non-redundant proteins, with 67% confirmed as PM or PM-related proteins, and no endoplasmic reticulum or nuclear proteins were detected.

Conclusions:

  • The developed protocol provides a simple, economical, and reproducible method for high-purity plasma membrane isolation.
  • This technique is suitable for comprehensive proteomic characterization of liver plasma membrane.
  • The improved purity and reduced contamination enable more accurate identification of PM-specific proteins.

More Related Videos

Resolving Affinity Purified Protein Complexes by Blue Native PAGE and Protein Correlation Profiling09:35

Resolving Affinity Purified Protein Complexes by Blue Native PAGE and Protein Correlation Profiling

Published on: April 1, 2017

Microsampling in Targeted Mass Spectrometry-Based Protein Analysis of Low-Abundance Proteins10:21

Microsampling in Targeted Mass Spectrometry-Based Protein Analysis of Low-Abundance Proteins

Published on: January 13, 2023

Related Concept Videos

Immunoprecipitation01:20

Immunoprecipitation

Immunoprecipitation, or IP, is a widely used technique that employs protein-antibody interactions to isolate proteins or protein complexes in their native state for studying protein-protein interactions, quaternary structures, or supramolecular complexes. Various modifications of the technique, including chromatin IP, cross-linking IP, and fluorescence IP, are commonly used.
Chromatin Immunoprecipitation
Chromatin immunoprecipitation, also known as ChIP, is used to study protein-DNA or...
Affinity Chromatography01:03

Affinity Chromatography

Affinity chromatography is a powerful technique extensively utilized for separating and purifying specific biomolecules from complex mixtures. It capitalizes on the highly selective binding between an analyte and its counterpart, such as antibody-antigen interactions. The counterpart is immobilized on the stationary phase, forming an affinity column. The stationary phase typically consists of solid support, such as agarose or porous glass beads, immobilizing the affinity ligand. The mobile...