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Related Experiment Videos

Structure and flexibility of the multiple domain proteins that regulate complement activation.

M D Kirkitadze1, P N Barlow

  • 1Center for Neurological Diseases, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA.

Immunological Reviews
|June 21, 2001
PubMed
Summary
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Regulators of complement activation (RCA) proteins, built from complement control protein (CCP) modules, display complex structures and functions. Biophysical studies reveal diverse intermodular connections influencing protein flexibility and function.

Area of Science:

  • Structural biology
  • Biophysics
  • Immunology

Background:

  • Regulators of complement activation (RCA) are crucial for controlling the early stages of the complement system.
  • These proteins are homologous and primarily composed of complement control protein (CCP) modules.
  • RCA proteins lack other common module types found in multiple domain proteins.

Purpose of the Study:

  • To review over a decade of biophysical research on the structural biology of RCA proteins.
  • To explore the structural diversity and functional implications of CCP modules and their interconnections.
  • To discuss the concept of modularity within CCPs and its broader relevance.

Main Methods:

  • Biophysical exploration
  • Structural biology techniques (complementary methods were combined)

Related Experiment Videos

  • Review of existing literature

    • Main Results:

    • Individual CCP modules show significant variations within a common structural theme.
    • Intermodular connections are diverse, with some stabilizing adjacent modules and others forming binding surfaces.
    • The functional sophistication of RCA proteins is not immediately apparent from their seemingly simple modular structure.

    Conclusions:

    • The study of RCA proteins highlights the importance of integrating various structural biology techniques.
    • Findings have implications for understanding protein folding, evolution, flexibility, and structure-function relationships in multiple domain proteins.
    • The true modularity of CCPs remains an area for further investigation.