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The structural basis for the collagen processing by human P3H1/CRTAP/PPIB ternary complex.

Wenguo Li1,2, Junjiang Peng2, Deqiang Yao3

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Understanding collagen processing machinery is key to treating disorders like osteogenesis imperfecta (OI). This study reveals the structure of the P3H1/CRTAP/PPIB complex, uncovering its bifunctional mechanism and collagen interaction sites.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Medicine

Background:

  • Collagen posttranslational modification is essential for tissue integrity.
  • Defects in collagen processing cause disorders such as osteogenesis imperfecta (OI).
  • The structural basis of the P3H1/CRTAP/PPIB collagen processing complex remains elusive.

Purpose of the Study:

  • To elucidate the structural organization and mechanism of the P3H1/CRTAP/PPIB complex.
  • To understand how this complex processes collagen.
  • To provide insights into the molecular pathology of collagen-related disorders.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) was used to determine the structures of the P3H1/CRTAP/PPIB complex.
  • Structures were determined for the complex alone and in complex with a collagen peptide.
  • Mutagenesis and inhibitor studies were performed to investigate complex dynamics.

Main Results:

  • The active sites of P3H1 and PPIB form a bifunctional reaction center, suggesting coupled modification.
  • Multiple collagen peptide binding sites were identified, indicating a substrate interaction zone.
  • A dual-ternary complex was observed, with its equilibrium sensitive to mutations and PPIB inhibitors.

Conclusions:

  • The study provides high-resolution structures of the P3H1/CRTAP/PPIB complex, revealing its mechanism of action.
  • These findings offer a structural basis for understanding collagen processing and OI pathogenesis.
  • The identified dual-ternary complex and its regulation provide new avenues for therapeutic intervention.