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Bacterial Peptide Display for the Selection of Novel Biotinylating Enzymes

Bacterial Peptide Display for the Selection of Novel Biotinylating Enzymes

Published on: October 3, 2019

Phosphopeptide Detection with Biotin-Labeled Phos-tag.

Emiko Kinoshita-Kikuta¹, Eiji Kinoshita², Tohru Koike¹

¹Department of Functional Molecular Science, Institute of Biomedical & Health Sciences, Hiroshima University, Hiroshima, 734-8553, Japan.

Methods in Molecular Biology (Clifton, N.J.)

|November 21, 2015

Summary

A new microarray method uses biotin-labeled Phos-tag to detect protein kinase activity. This technique enables sensitive, high-throughput profiling of cellular signaling and drug screening.

Keywords:

Biotin Enhanced chemiluminescence High-throughput profiling Microarray Peptide Phos-tag Phosphorylation Protein kinase

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Area of Science:

Biochemistry
Molecular Biology
Analytical Chemistry

Background:

Protein kinases are crucial drug targets and disease biomarkers.
Accurate measurement of protein kinase activity is essential for phosphoproteomics.
Existing analytical techniques may lack the sensitivity or throughput required.

Purpose of the Study:

To develop a highly sensitive microarray-based technique for tracing protein kinase activities.
To establish a protocol for detecting phosphopeptides using biotin-labeled Phos-tag.
To create a system for high-throughput profiling of intracellular protein kinase activities.

Main Methods:

Immobilizing specific peptide substrates of protein kinases on a glass slide.
Subjecting immobilized peptides to phosphorylation using cell lysates.
Detecting phosphorylated peptides using biotin-labeled Phos-tag and horseradish peroxidase-conjugated streptavidin.
Analyzing enhanced chemiluminescence signals with an automatic image analyzer.

Main Results:

Demonstration of a sensitive method for detecting phosphopeptides.
Development of a microarray system for simultaneous detection of multiple kinase activities.
Successful application of biotin-labeled Phos-tag for enhanced chemiluminescence detection.

Conclusions:

The Phos-tag-based microarray method provides sensitive detection of protein kinase activities.
This technique facilitates high-throughput profiling of cellular signaling pathways.
Potential applications include rapid screening of kinase activators and inhibitors for drug discovery.