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A BRET-based Assay Reveals collagen-Hsp47 Interaction Dynamics in the Endoplasmic Reticulum and Small-Molecule Inhibition of This Interaction

A BRET-based Assay Reveals collagen-Hsp47 Interaction Dynamics in the Endoplasmic Reticulum and Small-Molecule Inhibition of This Interaction

Shinya Ito, Masazumi Saito, Masahito Yoshida, Koh Takeuchi, Takayuki Doi, Kazuhiro Nagata

J Biol Chem. 2019 Nov 1;294(44):15962-15972.

PMID: 31492754

Abstract:

Molecular chaperones perform pivotal roles in proteostasis by engaging in protein-protein interactions (PPIs). The collagen-specific molecular chaperone Hsp47 (heat shock protein 47) interacts with procollagen in the endoplasmic reticulum (ER) and plays crucial roles in collagen synthesis. PPIs between Hsp47 and collagen could offer a therapeutic target for fibrosis, which is characterized by abnormal collagen accumulation in the extracellular matrix of fibrotic organs. Herein, we established a bioluminescence resonance energy transfer (BRET) system for assessing Hsp47-collagen interaction dynamics within the ER. After optimization and validation of the method, we could demonstrate inhibition of the interaction between Hsp47 and collagen by a small molecule (Col003) in the ER. Using the BRET system, we also found that Hsp47 interacts not only with the Gly-Pro-Arg motif but also weakly with Gly-Pro-Hyp motifs of triple-helical collagen in cells. Moreover, we found that the serpin loop of Hsp47 (SerpinH1) contributes to its binding to collagen. We propose that the method developed here can provide valuable information on PPIs between Hsp47 and collagen and on the effects of PPI inhibitors important for the management of fibrotic disorders.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP328565168	Col003		328565-16-8	Price

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