A benchmarked protein microarray-based platform for the identification of novel low-affinity extracellular protein...

Area of Science:

• Biochemistry
• Molecular Biology
• Cell Biology

Background:

• Low-affinity extracellular protein interactions are crucial for cellular recognition.
• Current detection methods lack the scale for genome-wide screens, hindering discovery.
• Detecting these weak interactions is essential for understanding cellular processes.

Purpose of the Study:

• To miniaturize the avidity-based extracellular interaction screen (AVEXIS) assay using protein microarray technology.
• To develop a scalable platform for genome-wide screening of extracellular protein interactions.
• To enable sensitive detection and affinity estimation of low-affinity protein interactions.

Main Methods:

• Developed novel protein tags and sample preparation for parallel purification of hundreds of recombinant mammalian proteins.
• Adapted the AVEXIS assay to a protein microarray format.
• Benchmarked the assay using known receptor-ligand pairs to assess sensitivity and specificity.

Main Results:

• Successfully miniaturized the AVEXIS assay onto protein microarrays.
• The assay demonstrates high sensitivity, detecting weak interactions characteristic of extracellular protein binding.
• Enabled observation of saturation binding for specificity assessment and direct estimation of interaction affinities.
• Validated the method against known protein interactions.

Conclusions:

• The protein microarray-based AVEXIS assay is a powerful, miniaturized tool for large-scale screening of extracellular protein interactions.
• This scalable approach overcomes previous limitations, enabling genome-wide discovery of novel receptor-ligand interactions.
• The method facilitates sensitive detection and affinity quantification of weak protein-protein binding events.