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A quantitative, high-throughput screen for protein stability.

S Ghaemmaghami1, M C Fitzgerald, T G Oas

  • 1Department of Biochemistry, Duke University Medical Center, Durham, NC 27710, USA.

Proceedings of the National Academy of Sciences of the United States of America
|July 13, 2000
PubMed
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SUPREX is a new technique measuring protein stability using hydrogen exchange and mass spectrometry. This rapid, high-throughput method accurately assesses unpurified protein samples, crucial for proteomic research.

Area of Science:

  • Proteomics
  • Biophysical Chemistry
  • Mass Spectrometry

Background:

  • Assessing protein structural stability is vital in proteomic research.
  • Current methods for protein stability assessment are often time-consuming and require purified samples.
  • A high-throughput method for analyzing unpurified protein stability is needed.

Purpose of the Study:

  • To introduce and validate a novel technique, Stability of Unpurified Proteins from rates of H/D exchange (SUPREX), for measuring protein stability.
  • To demonstrate the applicability of SUPREX for rapid, high-throughput screening of protein stability in unpurified samples.
  • To compare SUPREX results with conventional methods and assess its precision across various stability ranges.

Main Methods:

  • Utilizing hydrogen deuterium exchange (H/D exchange) coupled with matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS).

Related Experiment Videos

  • Measuring microgram quantities of unpurified protein extracts.
  • Employing SUPREX to determine the stability of proteins like maltose binding protein and lambda repressor variants.

    • Main Results:

    • SUPREX results for maltose binding protein and lambda repressor variants showed strong agreement with conventional circular dichroism (CD) denaturation data.
    • The method successfully detected changes in protein stability upon ligand binding, such as maltose binding to maltose binding protein.
    • SUPREX demonstrated high precision across a broad spectrum of protein stabilities.

    Conclusions:

    • SUPREX provides a rapid, high-throughput, and accurate method for assessing protein stability using unpurified samples.
    • This technique is valuable for proteomic research, enabling efficient screening of protein structural integrity.
    • SUPREX offers a precise and versatile tool for biophysical characterization of proteins and their interactions.