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2D and 3D Matrices to Study Linear Invadosome Formation and Activity
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Mapping and Exploring the Collagen-I Proteostasis Network.

Andrew S DiChiara1, Rebecca J Taylor1, Madeline Y Wong1

  • 1Department of Chemistry, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.

ACS Chemical Biology
|February 6, 2016
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Summary
This summary is machine-generated.

This study maps the collagen-I proteostasis network, identifying new players and a novel post-translational modification. It reveals Erp29

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Collagen-I proteostasis, crucial for human health, is poorly understood.
  • Collagen misfolding causes severe diseases, yet its mechanisms are unclear.
  • No interactomic studies have mapped the collagen-I proteostasis network.

Purpose of the Study:

  • To map the collagen-I proteostasis network for the first time.
  • To identify novel proteins and post-translational modifications involved in collagen-I regulation.
  • To investigate the role of Erp29 in collagen-I processing.

Main Methods:

  • Generated stable fibrosarcoma cells expressing tagged collagen-I.
  • Utilized selective immunoprecipitation and quantitative mass spectrometry-based proteomics.
  • Performed biochemical validation of identified network players.

Main Results:

  • Successfully mapped the collagen-I proteostasis network.
  • Identified numerous new proteins involved in collagen-I folding, quality control, and secretion.
  • Discovered aspartyl-hydroxylation as a new collagen-I post-translational modification.
  • Found Erp29 plays a key role in collagen-I retention under ascorbate deficiency.

Conclusions:

  • Provides novel insights into molecular mechanisms of collagen-I proteostasis.
  • Offers a detailed roadmap for future research on collagen biology and disease.
  • The developed cellular platform can facilitate studies on collagen variants and therapeutic strategies for collagenopathies.