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Related Concept Videos

A Serum Bactericidal Assay for the Complement-Mediated Bactericidal Activity of Antibodies05:40

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This video demonstrates a technique to evaluate the complement-mediated bactericidal activity of antibodies present in serum. This approach combines isolated serum with pathogenic bacteria and exogenous complement proteins. Upon incubation, the bacteria are grown on an agar plate, and the produced colonies are quantified to measure the serum bactericidal...
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X-ray Diffraction of Intact Murine Skeletal Muscle as a Tool for Studying the Structural Basis of Muscle Disease08:26

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Complement System01:27

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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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Complementation Tests00:49

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A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
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Related Experiment Video

Updated: Jan 19, 2026

X-ray Diffraction of Intact Murine Skeletal Muscle as a Tool for Studying the Structural Basis of Muscle Disease
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Structural Basis for Properdin Oligomerization and Convertase Stimulation in the Human Complement System.

Dennis V Pedersen1, Trine A F Gadeberg1, Caroline Thomas2

  • 1Department of Molecular Biology and Genetics, Center for Structural Biology, Aarhus University, Aarhus, Denmark.

Frontiers in Immunology
|September 12, 2019
PubMed
Summary
This summary is machine-generated.

Properdin stabilizes complement convertases by binding C3b and Bb, enhancing immune response. It also inhibits C3b degradation, offering insights into complement system regulation and deficiencies.

Keywords:
complementcomplement component C3convertasecrystal structurefactor Bproperdinregulation

More Related Videos

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Related Experiment Videos

Last Updated: Jan 19, 2026

X-ray Diffraction of Intact Murine Skeletal Muscle as a Tool for Studying the Structural Basis of Muscle Disease
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Purification of Human S100A12 and Its Ion-induced Oligomers for Immune Cell Stimulation
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Area of Science:

  • Immunology
  • Structural Biology
  • Biochemistry

Background:

  • Properdin (FP) is a key regulator of the alternative pathway in the complement system.
  • FP enhances the activity of the C3 convertase C3bBb, a crucial component of innate immunity.

Purpose of the Study:

  • To elucidate the structural basis of Properdin's function in complement activation.
  • To understand how Properdin interacts with C3b and Bb to stabilize the C3 convertase.
  • To investigate Properdin's role in inhibiting C3b degradation.

Main Methods:

  • X-ray crystallography to determine structures of Properdin alone and bound to the C3 convertase.
  • Biochemical binding experiments to confirm structural findings.
  • Analysis of mutation effects associated with Properdin deficiencies.

Main Results:

  • Detailed structures of Properdin and Properdin-bound convertase reveal key interaction sites.
  • Properdin's thrombospondin repeats (TSRs) and TB domain form the convertase binding site, primarily interacting with C3b.
  • Properdin stabilizes the convertase by interacting with C3b and Bb, and inhibits C3b degradation by competing for binding sites.

Conclusions:

  • The structures provide a molecular understanding of Properdin's function in stabilizing complement convertases.
  • Properdin's oligomeric structure and flexibility contribute to its extended architecture.
  • These findings offer a structural basis for analyzing Properdin function, deficiencies, and potential roles in pattern recognition.