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Related Concept Videos

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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 membrane...
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Structure of human complement C8, a precursor to membrane attack.

Doryen Bubeck1, Pietro Roversi, Rossen Donev

  • 1University of Oxford, Wellcome Trust Centre for Human Genetics, Oxford OX3 7BN, UK.

Journal of Molecular Biology
|November 16, 2010
PubMed
Summary
This summary is machine-generated.

The study reveals the structure of complement component C8, crucial for antibacterial immunity. This structural insight explains how C8 subunits assemble to form the membrane attack complex (MAC) pore.

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Area of Science:

  • Immunology
  • Structural Biology
  • Biochemistry

Background:

  • Complement component C8 is essential for forming the membrane attack complex (MAC), a key antibacterial immune effector.
  • C8 initiates membrane penetration and orchestrates MAC pore formation, but its subunit organization remains structurally undefined.
  • Existing high-resolution structures of C8 subunits lack information on intersubunit organization crucial for MAC assembly.

Purpose of the Study:

  • To determine the structure of the C8 heterotrimer and elucidate how its subunits are organized to facilitate MAC assembly.
  • To provide structural insights into the functional mechanisms of C8 during MAC formation.

Main Methods:

  • Determined the structure of C8 using electron microscopy.
  • Fitted the C8α-MACPF-C8γ co-crystal structure into the electron microscopy density.
  • Incorporated a homology model for C8β-MACPF into the density map.

Main Results:

  • The study presents the overall structure of the C8 heterotrimer.
  • Demonstrated the accessibility of the C8γ protrusion, which is involved in MAC assembly.
  • Showed that the C8α-MACPF region, responsible for membrane insertion upon activation, is also accessible.

Conclusions:

  • The determined structure provides a framework for understanding C8 function in MAC assembly.
  • The accessibility of key functional regions (C8γ protrusion and C8α-MACPF) offers insights into C8's role in membrane attack.
  • This structural information is vital for comprehending the antibacterial mechanisms of the complement system.