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Related Experiment Videos

The molecular architecture of human complement component C6.

R G DiScipio1, T E Hugli

  • 1Research Institute of Scripps Clinic, La Jolla, California 92037.

The Journal of Biological Chemistry
|September 25, 1989
PubMed
Summary
This summary is machine-generated.

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The molecular structure of human complement component C6 was detailed, revealing its primary and secondary structures, disulfide bonds, and glycoprotein nature. This provides insights into complement system function and related proteins.

Area of Science:

  • Immunology
  • Structural Biology
  • Molecular Biology

Background:

  • The human complement system is crucial for innate immunity.
  • Terminal complement components (C5-C9) form the membrane attack complex.
  • Understanding C6 structure is key to deciphering complement-mediated lysis.

Purpose of the Study:

  • To elucidate the molecular architecture of human complement component C6.
  • To determine the primary, secondary, and tertiary structures of C6.
  • To compare C6 structure with other complement components and related proteins.

Main Methods:

  • Complement component C6 cDNA sequencing from a human liver library.
  • Circular dichroism spectroscopy for secondary structure analysis.
  • Transmission electron microscopy for tertiary structure visualization.

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Main Results:

  • The primary structure of C6 comprises 913 amino acids, showing homology with C7-C9.
  • C6 contains 32 disulfide bonds and exhibits homology with thrombospondin, LDL receptor, EGF, and complement factors H and I.
  • Secondary structure analysis revealed 12% alpha-helix, 29% beta-sheet, and 21% beta-turns; tertiary structure visualized as a sickle shape (144 x 66 Å).

Conclusions:

  • The study provides a comprehensive structural characterization of human complement component C6.
  • C6's structural features suggest functional roles and evolutionary relationships within the complement cascade.
  • Structural insights into C6 contribute to understanding the membrane attack complex and its implications in disease.