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Purification and functional characterization of factor I.

Sara C Nilsson1, Anna M Blom

  • 1Department of Laboratory Medicine, Section of Medical Protein Chemistry, The Wallenberg Laboratory, Lund University, Skåne University Hospital, Malmö, Sweden.

Methods in Molecular Biology (Clifton, N.J.)
|November 13, 2013
PubMed
Summary

This study presents a new method for purifying Factor I (FI), a key complement inhibitor, from human plasma. A functional assay was also developed to assess the activity of purified Factor I.

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Area of Science:

  • Immunology
  • Biochemistry

Background:

  • Factor I (FI) is a crucial plasma glycoprotein that regulates complement system activation.
  • FI inhibits all complement pathways by degrading C4b and C3b fragments.
  • Its function is cofactor-dependent, involving proteins like C4b-binding protein and factor H.

Purpose of the Study:

  • To develop an efficient method for purifying Factor I from human plasma.
  • To establish a functional assay for assessing Factor I activity.

Main Methods:

  • Purification involved a combination of affinity chromatography and anion exchange chromatography.
  • Functional assessment utilized a specific assay to measure Factor I's enzymatic activity.

Main Results:

  • A reproducible method for isolating high-purity Factor I from human plasma was established.

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  • A reliable functional assay was developed to quantify Factor I's complement inhibitory capacity.

    • Conclusions:

    • The described purification method provides a reliable source of Factor I for research.
    • The functional assay enables accurate assessment of Factor I activity, aiding in complement system studies.