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Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...

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Updated: Jun 5, 2026

Extracellular Protein Microarray Technology for High Throughput Detection of Low Affinity Receptor-Ligand Interactions

Extracellular Protein Microarray Technology for High Throughput Detection of Low Affinity Receptor-Ligand Interactions

Published on: January 7, 2019

A peptide aldehyde microarray for high-throughput profiling of cellular events.

Hao Wu¹, Jingyan Ge, Peng-Yu Yang

¹Department of Chemistry, 3 Science Drive 3, National University of Singapore, Singapore 117543.

Journal of the American Chemical Society

|January 21, 2011

Summary

This summary is machine-generated.

We developed a small-molecule microarray (SMM) to profile enzyme activity in complex biological samples. This targeted approach successfully identified cysteine proteases and their activity in various cellular and infected samples.

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Area of Science:

Proteomics
Biochemistry
Enzymology

Background:

Microarrays offer powerful tools for large-scale biological analysis.
Understanding enzymatic activity in native samples is crucial for biological research.

Purpose of the Study:

To develop a small-molecule microarray (SMM) for profiling enzyme activity.
To enable large-scale functional assessment of cysteine proteases in complex samples.

Main Methods:

A focused positional-scanning library of 270 enzyme inhibitors was synthesized.
Peptide aldehyde-based inhibitors were immobilized onto avidin slides to create the SMM.
The SMM was used to analyze pure proteins, cellular lysates, and infected samples.

Main Results:

The SMM specifically targeted cysteine proteases, showing consistent binding fingerprints with model proteins.
Clear protease activity signatures were obtained from apoptotic Hela cells and Plasmodium falciparum-infected red blood cells.
The SMM distinguished parasite infection stages within erythrocyte lysates.
Putative protein markers were identified and validated using a probe derived from a microarray hit.

Conclusions:

Targeted SMMs are effective for dissecting cellular biology in complex proteomic samples.
This approach facilitates large-scale functional assessment and discovery of enzyme activity.
The SMM technology holds potential for target validation and biomarker discovery.