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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...

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Isolation and Characterization Of Chimeric Human Fc-expressing Proteins Using Protein A Membrane Adsorbers And A Streamlined Workflow
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A method of purifying intact complement factor H from human plasma.

Feng-Mei Wang1, Feng Yu, Ming-Hui Zhao

  • 1Renal Division, Department of Medicine, Peking University First Hospital, Beijing 10034, China; Institute of Nephrology, Peking University, Beijing 10034, China; Key Laboratory of Renal Disease, Ministry of Health of China, Beijing 10034, China; Key Laboratory of Chronic Kidney Disease Prevention and Treatment, Ministry of Education of China, Beijing 100034, China.

Protein Expression and Purification
|August 3, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed a high-yield purification method for intact complement factor H (CFH) from human plasma. This new process ensures high purity and functional comparability to commercial CFH, suitable for lab and clinical use.

Keywords:
ChromatographyComplement factor HHuman plasmaPurification

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Area of Science:

  • Biochemistry
  • Immunology
  • Protein Purification

Background:

  • Complement factor H (CFH) is a crucial regulator of the alternative complement pathway.
  • Deficiency or dysfunction of CFH is associated with various diseases, including age-related macular degeneration and atypical hemolytic uremic syndrome.
  • Efficient purification of intact and functional CFH is essential for research and therapeutic applications.

Purpose of the Study:

  • To establish a stable, high-yield, and high-purity method for purifying intact complement factor H (CFH) from human plasma.
  • To characterize the functional properties of the purified CFH in vitro and compare them with commercially available CFH.

Main Methods:

  • Human plasma was subjected to polyethylene glycol (PEG) precipitation.
  • Sequential chromatography using l-lysine Sepharose, Resource Q, and Sephacryl S-300 columns was employed.
  • Purification was performed using Fast Protein Liquid Chromatography (FPLC) at 4°C; purity and identity were confirmed by SDS-PAGE and Western blot.

Main Results:

  • A homogeneous preparation of intact CFH was obtained with a yield of 26±3%.
  • The purified CFH demonstrated comparable binding abilities to C3b and mCRP, protective function against hemolysis, and cofactor activity for complement factor I-mediated C3b inactivation as commercial CFH.
  • The developed method offers high yield and high purity compared to previous purification strategies.

Conclusions:

  • A stable and feasible system for purifying intact complement factor H from human plasma has been successfully established.
  • The method yields highly pure and functionally active CFH, suitable for laboratory and clinical investigations.
  • This optimized purification protocol provides a valuable resource for research into complement-mediated diseases and potential therapeutic development.