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Entactin: structure and function.

A E Chung1, M E Durkin

  • 1Department of Biological Sciences, University of Pittsburgh, PA 15260.

American Journal of Respiratory Cell and Molecular Biology
|October 1, 1990
PubMed
Summary
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Entactin is a key basement membrane protein that bridges laminin and type IV collagen. Its calcium-binding ability and protease sensitivity are crucial for basement membrane assembly and remodeling.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Extracellular Matrix Research

Background:

  • Entactin is a ubiquitous basement membrane protein.
  • Mouse and human entactin share 85% sequence identity.
  • Entactin possesses three structural domains: N-terminal globule (I), stalk (II), and C-terminal globule (III).

Purpose of the Study:

  • To investigate the role of entactin in basement membrane assembly.
  • To explore entactin's function as a molecular bridge between laminin and type IV collagen.
  • To understand the implications of entactin's calcium-binding and protease sensitivity.

Main Methods:

  • Amino acid sequence determination of mouse and human entactin.
  • Analysis of entactin's structural domains and binding properties.

Related Experiment Videos

  • Gene transfection studies using human choriocarcinoma (JAR) cells.

    • Main Results:

    • Entactin binds calcium ions and supports cell adhesion.
    • Entactin's carboxyl globule binds to laminin and type IV collagen, acting as a molecular bridge.
    • Transfection of entactin into JAR cells stimulated the incorporation of laminin and type IV collagen into the extracellular matrix.

    Conclusions:

    • Entactin is essential for basement membrane assembly by connecting laminin and type IV collagen.
    • Calcium-binding activity may facilitate matrix assembly.
    • Protease sensitivity suggests entactin's role in tissue remodeling and turnover.