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Collagen's primary structure determines collagen:HSP47 complex stoichiometry.

Elena T Abraham1, Sinan Oecal1, Matthias Mörgelin2

  • 1Faculty of Mathematics and Natural Sciences, Institute of Biochemistry, University of Cologne, Cologne, Germany.

The Journal of Biological Chemistry
|September 6, 2021
PubMed
Summary
This summary is machine-generated.

Heat shock protein 47 (HSP47) binds collagen for proper folding. This study reveals that specific hydrophobic amino acids in collagen enhance HSP47 binding, forming a 1:1 complex and altering binding site interactions.

Keywords:
collagencrystal structureextracellular matrix proteinsprotein–protein interactionstoichiometry

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Collagens are crucial for organism development and homeostasis.
  • Heat shock protein 47 (HSP47) is essential for collagen folding and secretion.
  • The precise binding interactions between HSP47 and collagen remain unclear.

Purpose of the Study:

  • To characterize high-affinity binding sites of HSP47 on collagen peptides.
  • To investigate the structural basis of HSP47-collagen interactions.
  • To elucidate the stoichiometry and conformational changes during binding.

Main Methods:

  • Utilized a collagen II peptide library to identify binding sites.
  • Determined crystal structures of HSP47 bound to collagen peptides.
  • Analyzed binding affinities and stoichiometry.

Main Results:

  • Identified large hydrophobic amino acids (e.g., phenylalanine) as key determinants of high-affinity HSP47 binding.
  • Revealed local conformational rearrangements in HSP47 upon binding.
  • Discovered an unexpected 1:1 binding stoichiometry, differing from previous observations.
  • Explained the altered stoichiometry by steric hindrance caused by hydrophobic residues.

Conclusions:

  • HSP47 binding to collagen is influenced by specific amino acid residues, particularly hydrophobic ones.
  • The crystal structures provide novel insights into HSP47 conformational flexibility and binding modes.
  • The 1:1 complex formation highlights the importance of considering individual collagen strands as distinct interaction surfaces.
  • Findings may inform understanding of collagen-chaperone interactions and higher-order complex formation.