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Is SPARC an evolutionarily conserved collagen chaperone?

N Martinek1, J Shahab, J Sodek

  • 1Department of Cell and Systems Biology, University of Toronto, 25 Harbord Street, Toronto, ON, Canada M5S 3G5.

Journal of Dental Research
|March 27, 2007
PubMed
Summary
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SPARC acts as a collagen chaperone, working with HSP47 to ensure proper protein folding in the endoplasmic reticulum. This process is crucial for collagen deposition and tissue integrity in various organisms.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Collagen scaffolds are vital for connective tissues and basement membranes, assembled via pro-collagen alpha-chain folding.
  • Endoplasmic reticulum chaperones, including HSP47, guide pro-collagen assembly and dissociation.
  • SPARC, a collagen-binding glycoprotein, is co-expressed with collagen in remodeling tissues.

Purpose of the Study:

  • To investigate the role of SPARC as an intracellular collagen chaperone.
  • To elucidate the collaborative function of SPARC and HSP47 in collagen processing.
  • To understand SPARC's role in collagen deposition and extracellular matrix formation.

Main Methods:

  • Analysis of genome project data for conserved SPARC sequences.
  • Comparative studies in invertebrates lacking HSP47.

Related Experiment Videos

  • Observation of collagen deposition in mammalian tissues with and without SPARC expression.

    • Main Results:

    • SPARC's collagen-binding domains are evolutionarily conserved.
    • SPARC is essential for collagen IV deposition in invertebrates.
    • Absence of SPARC correlates with collagen deposition defects in mammals.
    • SPARC functions intracellularly as a chaperone in the endoplasmic reticulum.

    Conclusions:

    • SPARC acts as an intracellular collagen chaperone, collaborating with HSP47 in higher organisms.
    • SPARC ensures correct pro-collagen folding and exit from the endoplasmic reticulum.
    • SPARC's transport through the Golgi suggests roles in post-ER collagen fibrillogenesis.