A highly specific graphene platform for sensing collagen triple helix

Area of Science:

• Biomolecular Engineering
• Biosensor Technology
• Molecular Diagnostics

Background:

• Chronic fibroproliferative diseases are prevalent, necessitating simple and efficient collagen biomarker detection methods.
• Existing biosensors often leverage DNA's double helix structure; novel approaches are needed for collagen's triple helix.
• Graphene oxide (GO) has shown promise in biosensor development.

Purpose of the Study:

• To create a highly specific graphene oxide (GO) platform for sensing the collagen triple helix.
• To develop a fluorescence-enhanced assay for quantitative detection of collagen peptides.

Main Methods:

• Designed a dye-labeled single-stranded collagen (ssCOL) peptide probe.
• Utilized GO's binding properties to quench probe fluorescence.
• Observed fluorescence retention upon hybridization of the ssCOL probe with its target collagen peptide (GPO).

Main Results:

• Demonstrated a fluorescence-enhanced assay sensitive and selective for target collagen peptides.
• Showed minimal interference from other proteins in complex biological fluids.
• Successfully applied the assay for quantitative detection.

Conclusions:

• The GO-based ssCOL platform is a promising tool for molecular diagnostics of fibroproliferative diseases.
• This approach offers a novel strategy for creating efficient assays for proteins with triple helix motifs.
• Potential applications include detecting proteins like collectins, adiponectin, and C1q.