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

Wenguo Li, Junjiang Peng, Deqiang Yao, Bing Rao, Ying Xia, Qian Wang, Shaobai Li, Mi Cao, Yafeng Shen, Peixiang Ma, Rijing Liao, An Qin (), Jie Zhao () and Yu Cao ()
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Wenguo Li: Shanghai Jiao Tong University School of Medicine
Junjiang Peng: Shanghai Jiao Tong University School of Medicine
Deqiang Yao: Shanghai Jiao Tong University School of Medicine
Bing Rao: Shanghai Jiao Tong University School of Medicine
Ying Xia: Shanghai Jiao Tong University School of Medicine
Qian Wang: Shanghai Jiao Tong University School of Medicine
Shaobai Li: Shanghai Jiao Tong University School of Medicine
Mi Cao: Shanghai Jiao Tong University School of Medicine
Yafeng Shen: Shanghai Jiao Tong University School of Medicine
Peixiang Ma: Shanghai Jiao Tong University School of Medicine
Rijing Liao: Shanghai Jiao Tong University School of Medicine
An Qin: Shanghai Jiao Tong University School of Medicine
Jie Zhao: Shanghai Jiao Tong University School of Medicine
Yu Cao: Shanghai Jiao Tong University School of Medicine

Nature Communications, 2024, vol. 15, issue 1, 1-14

Abstract: Abstract Collagen posttranslational processing is crucial for its proper assembly and function. Disruption of collagen processing leads to tissue development and structure disorders like osteogenesis imperfecta (OI). OI-related collagen processing machinery includes prolyl 3-hydroxylase 1 (P3H1), peptidyl-prolyl cis-trans isomerase B (PPIB), and cartilage-associated protein (CRTAP), with their structural organization and mechanism unclear. We determine cryo-EM structures of the P3H1/CRTAP/PPIB complex. The active sites of P3H1 and PPIB form a face-to-face bifunctional reaction center, indicating a coupled modification mechanism. The structure of the P3H1/CRTAP/PPIB/collagen peptide complex reveals multiple binding sites, suggesting a substrate interacting zone. Unexpectedly, a dual-ternary complex is observed, and the balance between ternary and dual-ternary states can be altered by mutations in the P3H1/PPIB active site and the addition of PPIB inhibitors. These findings provide insights into the structural basis of collagen processing by P3H1/CRTAP/PPIB and the molecular pathology of collagen-related disorders.

Date: 2024
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DOI: 10.1038/s41467-024-52321-6

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