HaloTag-based conjugation of proteins to barcoding-oligonucleotides

Area of Science:

• Biochemistry
• Molecular Biology
• Immunology

Background:

• Accurate protein quantification is crucial for detecting disease biomarkers.
• Existing methods often lack the sensitivity required for early disease detection.

Purpose of the Study:

• To develop a novel, highly sensitive protein quantification system named HaloTag protein barcoding.
• To validate the system's performance in detecting protein-protein interactions and disease-specific antibodies.

Main Methods:

• Covalent linking of target proteins to unique oligonucleotide barcodes using click chemistry.
• Utilizing a 1:1 conjugation ratio for precise molecule counting.
• Assessing sensitivity against luciferase assays and dynamic range against ELISA.

Main Results:

• HaloTag protein barcoding demonstrated significantly higher sensitivity than conventional luciferase assays.
• The system successfully identified 44% of known protein-protein interactions.
• The assay exhibited a dynamic range over 10,000 times wider than ELISA.
• Detection of anti-Desmoglein 3 antibodies in patient samples showed superior sensitivity compared to ELISA.

Conclusions:

• HaloTag protein barcoding offers a highly sensitive and precise method for protein quantification.
• The technology enables earlier disease detection, potentially improving patient outcomes.
• This system has broad applications in diagnostics and biological research.