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Updated: Jul 5, 2026

An Optimized Single-Molecule Pull-Down Assay for Quantification of Protein Phosphorylation

An Optimized Single-Molecule Pull-Down Assay for Quantification of Protein Phosphorylation

Published on: June 6, 2022

Permeabilization strategies to study protein phosphorylation.

¹The Salk Institute for Biological Studies, La Jolla, California, USA.

Current Protocols in Protein Science

|April 23, 2008

Summary

This summary is machine-generated.

This study details methods for labeling proteins using nucleotide triphosphates in vitro. Researchers can use these techniques for protein analysis in various cellular contexts.

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Area of Science:

Biochemistry
Molecular Biology
Cell Biology

Background:

Protein labeling is crucial for studying protein function and interactions.
Existing methods may require complex sample preparation or lack versatility.

Purpose of the Study:

To describe straightforward methods for in vitro protein labeling using nucleotide triphosphates.
To provide techniques for analyzing labeled proteins in permeabilized cells and isolated fractions.
To outline alternative methods for direct kinase analysis without cell permeabilization.

Main Methods:

In vitro labeling of proteins using [gamma-(32)P]ATP or [gamma-(32)P]GTP in permeabilized cells or cellular fractions.
Immunoprecipitation of labeled proteins from cell lysates.
Electrophoretic analysis of protein samples.
Direct analysis of cytosolic or membrane-bound kinases without permeabilization.
Methods for determining the specific radioactivity of 32P-labeled compounds.

Main Results:

Successful labeling of proteins in vitro using nucleotide triphosphates.
Efficient immunoprecipitation and subsequent analysis of labeled proteins.
Demonstration of a direct kinase analysis method.
Established protocols for radioactivity quantification.

Conclusions:

The described methods offer a versatile and straightforward approach for in vitro protein labeling and analysis.
Considerations are necessary for adapting these techniques to new biological systems.
These protocols facilitate the study of protein phosphorylation and kinase activity.