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Related Experiment Video

Updated: May 22, 2026

Quantification of Protein Interaction Network Dynamics using Multiplexed Co-Immunoprecipitation
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IQcat: multiplexed protein quantification by isoelectric QconCAT.

Ryan J Austin1, Deborah K Chang, Carly A Holstein

  • 1Institute for Systems Biology, Seattle, WA, USA.

Proteomics
|May 25, 2012
PubMed
Summary

We developed IQcat, a new method for protein quantification using mass spectrometry. This approach enables accurate protein measurement in complex samples and aids in studying cancer cell protein expression.

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Area of Science:

  • Proteomics
  • Mass Spectrometry
  • Biochemistry

Background:

  • Quantitative proteomics relies on accurate protein standards.
  • Current methods for producing standards can be complex and time-consuming.

Purpose of the Study:

  • To develop a generalizable and efficient strategy for creating isotopically labeled peptide standards.
  • To enable multiplex protein quantification in unlabeled samples using mass spectrometry.
  • To apply this method to study protein expression in biological systems.

Main Methods:

  • Developed the IQcat design strategy for concatenated peptide standards.
  • Utilized isoelectric focusing (pI) for MS-sample enrichment.
  • Employed rapid, scalable purification in Escherichia coli.
  • Validated absolute quantification of yeast proteins.
  • Applied the technique to prostate cancer cell studies.

Main Results:

  • Demonstrated the fidelity of IQcat-based absolute quantification over a broad concentration range.
  • Successfully applied the method for a quantitative study of androgen-dependent protein expression.
  • Achieved rapid, inexpensive, and scalable purification of labeled standards.

Conclusions:

  • IQcat provides a robust and efficient platform for multiplex protein quantification.
  • The method facilitates the study of protein expression in complex biological samples, including cancer research.
  • Isobaric peptide pooling by pI enhances MS-sample enrichment.