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Related Experiment Video

Updated: May 27, 2026

Identification of Protein Complexes in Escherichia coli using Sequential Peptide Affinity Purification in Combination with Tandem Mass Spectrometry

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Published on: November 12, 2012

Elucidating protein: DNA complex by oligonucleotide DNA affinity purification.

Teddy T C Yang¹, Chi-Wing Chow

¹Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY, USA.

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

|November 25, 2011

Summary

Researchers identified novel protein kinases, p90 ribosomal S6 kinase (RSK) and p70 S6 kinase (S6K), that interact with transcription factor NFAT. This discovery advances understanding of gene expression regulation by transcription factor complexes.

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Area of Science:

Molecular Biology
Gene Regulation
Protein Interactions

Background:

Transcription factors regulate gene expression by recruiting co-factors.
Co-factors include enzymes like kinases, phosphatases, and ligases.
Identifying novel co-factors is crucial for understanding gene regulation mechanisms.

Purpose of the Study:

To identify novel protein kinases associated with the transcription factor NFAT.
To investigate the physical interaction between identified kinases and NFAT.

Main Methods:

Oligonucleotide affinity-binding approach to capture DNA-binding transcription factors.
In-gel kinase assays to detect phosphotransferase activity within the complex.
Co-immunoprecipitation to confirm physical interaction between proteins.

Main Results:

p90 ribosomal S6 kinase (RSK) and p70 S6 kinase (S6K) were identified in the NFAT:DNA complex.
RSK and S6K were shown to physically interact with NFATc4.
The study demonstrates the utility of affinity-binding assays coupled with enzymatic detection for identifying transcription co-factors.

Conclusions:

RSK and S6K are novel protein kinase co-factors associated with NFAT.
These findings elucidate new components in the NFAT-mediated gene regulatory network.
The methodology presented can be broadly applied to identify other types of transcription co-factors.