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Related Experiment Videos

Structural basis for vertebrate filamin dimerization.

Regina Pudas1, Tiila-Riikka Kiema, P Jonathan G Butler

  • 1Biocenter Oulu and Department of Biochemistry, University of Oulu, Finland.

Structure (London, England : 1993)
|January 12, 2005
PubMed
Summary
This summary is machine-generated.

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Filamins are vital actin-binding proteins. This study reveals the crystal structure of human filamin C

Area of Science:

  • Biochemistry
  • Structural Biology
  • Cell Biology

Background:

  • Filamins are large actin cross-linking proteins essential for cell motility and development.
  • They possess N-terminal actin-binding domains and a rod region of 24 Ig domains.
  • Filamin dimerization, critical for function, is mediated by the C-terminal Ig domain.

Purpose of the Study:

  • To elucidate the crystal structure of the 24th Ig domain (Ig24) of human filamin C.
  • To characterize the dimerization mechanism mediated by Ig24.
  • To investigate the functional implications of mutations within the dimerization interface.

Main Methods:

  • X-ray crystallography to determine the structure of human filamin C Ig24.
  • Biochemical assays to analyze dimerization and binding affinities.

Related Experiment Videos

  • Site-directed mutagenesis to probe the dimerization interface.

    • Main Results:

    • The crystal structure of human filamin C Ig24 reveals a novel dimerization interface.
    • This interface differs significantly from that of Dictyostelium discoideum filamin.
    • Point mutations at the interface disrupt dimerization, with a dissociation constant in the micromolar range.

    Conclusions:

    • The C-terminal Ig24 domain of human filamin C mediates dimerization through a unique interface.
    • The identified dimerization mechanism is likely conserved across vertebrate filamins.
    • Disruption of this interface affects filamin dimerization, impacting its function in cellular processes.