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Related Concept Videos

Complement System01:27

Complement System

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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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Extrinsic and Intrinsic Pathways of Hemostasis01:20

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Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
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Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
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Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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High-resolution Melting PCR for Complement Receptor 1 Length Polymorphism Genotyping: An Innovative Tool for Alzheimer's Disease Gene Susceptibility Assessment
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High-resolution Melting PCR for Complement Receptor 1 Length Polymorphism Genotyping: An Innovative Tool for Alzheimer's Disease Gene Susceptibility Assessment

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Factor H-related proteins determine complement-activating surfaces.

Mihály Józsi1, Agustin Tortajada2, Barbara Uzonyi3

  • 1MTA-ELTE 'Lendület' Complement Research Group, Department of Immunology, Eötvös Loránd University, Budapest, Hungary.

Trends in Immunology
|May 17, 2015
PubMed
Summary
This summary is machine-generated.

Complement factor H-related proteins (FHRs) regulate complement activation. Recent findings suggest FHRs may enhance complement pathways, impacting health and disease by competing with factor H (FH) for surface recognition.

Keywords:
CFHRscomplementdisease susceptibilityfactor Hfactor H-related proteins

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Area of Science:

  • Immunology
  • Molecular Biology
  • Protein Chemistry

Background:

  • Complement factor H-related proteins (FHRs) are structurally similar to complement inhibitor factor H (FH).
  • FHRs are implicated in diseases associated with complement dysregulation.
  • Initial assumptions posited FHRs as negative regulators of complement activation.

Purpose of the Study:

  • To review recent findings on the role of FHRs in complement regulation.
  • To propose a revised understanding of FHR function in health and disease.
  • To highlight the role of FHRs in discriminating self from non-self surfaces.

Main Methods:

  • Literature review of existing studies on FHRs and complement activation.
  • Analysis of evolutionary and structural relationships between FHRs and FH.
  • Synthesis of recent experimental data on FHR activities.

Main Results:

  • Contrary to initial beliefs, FHRs may enhance complement activation.
  • FHRs compete with FH, influencing surface recognition.
  • This competition plays a central role in appropriate complement pathway activation.

Conclusions:

  • FHRs are complex surface recognition molecules.
  • Their role in complement regulation is more nuanced than previously thought, potentially promoting activation.
  • Understanding FHR function is crucial for comprehending complement dysregulation in disease.