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Related Experiment Videos

Fibrillin-1: organization in microfibrils and structural properties

D P Reinhardt1, D R Keene, G M Corson

  • 1Shriners Hospital for Crippled Children, Research Department, Portland, Oregon 97201, USA.

Journal of Molecular Biology
|April 26, 1996
PubMed
Summary

Researchers mapped fibrillin-1 antibody binding sites on recombinant peptides to understand microfibril structure. Fibrillin-1 molecules are compacted in microfibrils, with N- and C-terminal ends near each other.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Fibrillin-1 is a major component of extracellular microfibrils.
  • Understanding fibrillin-1's organization is crucial for comprehending microfibril structure and function.

Purpose of the Study:

  • To investigate the microfibrillar organization and structural properties of fibrillin-1.
  • To map the binding sites of specific monoclonal antibodies (mAbs) on fibrillin-1.
  • To elucidate the arrangement of fibrillin-1 molecules within microfibrils.

Main Methods:

  • Production and purification of overlapping recombinant fibrillin-1 peptides in human cells.
  • Characterization of purified peptides under non-denaturing conditions.
  • Mapping of monoclonal antibody binding sites (mAbs 26, 69, 201) using recombinant peptides.

Related Experiment Videos

  • Immunolocalization of antibodies to microfibrils.
  • Analysis of antibody binding site distances and tissue labeling.

    • Main Results:

    • Monoclonal antibody binding sites were mapped to specific regions of the fibrillin-1 molecule: N-terminus (residues 45-450 for mAb 26), central region (residues 451-909 for mAb 201), and C-terminus (residues 2093-2871 for mAb 69).
    • Immunolocalization revealed that the N- and C-terminal ends of fibrillin-1 are in proximity, on opposite sides of microfibril beads, with central regions located between beads.
    • Each epitope was found once between each bead, suggesting a specific stoichiometry.
    • Comparison of peptide data with tissue labeling indicated that fibrillin molecules are compacted in their microfibrillar form.
    • New information on the eight-cysteine motif and suggestions of N- and C-terminal processing of fibrillins were obtained.

    Conclusions:

    • Fibrillin-1 molecules are organized in a compacted, head-to-tail or head-to-head arrangement within microfibrils, with N- and C-termini located close to each other.
    • The study provides models for fibrillin-1 organization in microfibrils and highlights the compaction of the protein in its native tissue form.
    • The findings contribute to understanding the structural basis of microfibril assembly and the role of fibrillin-1 in the extracellular matrix.