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Isolation of mouse complement component C7

Y Hitsumoto1, H Ohnishi, M Okada

  • 1Department of Clinical Laboratory Medicine, Ehime University School of Medicine, Japan.

Journal of Immunological Methods
|December 2, 1994
PubMed
Summary
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Researchers purified mouse complement component C7 from serum using a multi-step chromatographic process. This study details the successful isolation and characterization of highly pure mouse C7, crucial for complement system research.

Area of Science:

  • Immunology
  • Biochemistry

Background:

  • The complement system is a vital part of innate immunity.
  • Complement component C7 (C7) plays a critical role in the formation of the membrane attack complex.

Purpose of the Study:

  • To develop and optimize a purification protocol for mouse complement component C7.
  • To characterize the purity and yield of the isolated mouse C7.

Main Methods:

  • Sequential purification involving ammonium sulfate precipitation, DE-52 anion exchange chromatography, Protein G affinity chromatography, Mono S cation exchange chromatography, and Superdex 200 gel filtration.
  • Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) under reduced and non-reduced conditions to assess purity.
  • Biological activity assays to determine yield.

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Main Results:

  • A highly purified mouse C7 component was obtained.
  • SDS-PAGE revealed a single band at apparent molecular weights of 90 kDa (non-reduced) and 100 kDa (reduced).
  • The overall yield of purified C7, based on biological activity, was 7.0%.

Conclusions:

  • The established multi-step chromatographic method is effective for purifying mouse C7.
  • The purified mouse C7 is suitable for further functional and structural studies of the complement system.