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Related Experiment Videos

Global quantitative phosphoprotein analysis using Multiplexed Proteomics technology.

Thomas H Steinberg1, Brian J Agnew, Kyle R Gee

  • 1Proteomics Section, Molecular Probes Inc., 29851 Willow Creek Road, Eugene, OR 97402, USA.

Proteomics
|July 23, 2003
PubMed
Summary
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A new Pro-Q Diamond phosphoprotein dye enables specific, reversible fluorescent detection of phosphoproteins in gels. This technology aids in understanding cellular regulation and cancer pathways, compatible with mass spectrometry analysis.

Area of Science:

  • Proteomics and Post-Genomics Research
  • Cellular Signaling and Regulation
  • Biochemical Analysis and Detection

Background:

  • Protein phosphorylation is crucial for cellular processes and cancer-related signaling pathways.
  • Current methods lack satisfactory specific and reversible fluorescent detection for phosphoproteins in complex samples.
  • Advancements in proteomics require robust tools for analyzing post-translational modifications.

Purpose of the Study:

  • To introduce and evaluate the Pro-Q Diamond phosphoprotein dye technology for fluorescent detection of phosphoproteins.
  • To demonstrate the dye's specificity for phosphoserine, phosphothreonine, and phosphotyrosine residues.
  • To establish a method for quantitative, parallel analysis of protein expression and phosphorylation in 2-D gels.

Main Methods:

Related Experiment Videos

  • Development and application of Pro-Q Diamond phosphoprotein dye for direct detection in SDS-PAGE and 2-D gels.
  • Testing dye specificity against other macromolecules like DNA, RNA, and sulfated glycans.
  • Combining Pro-Q Diamond with SYPRO Ruby stain for multiplexed, dichromatic fluorescence detection.
  • Assessing sensitivity and linearity of fluorescence signal response.

Main Results:

  • Pro-Q Diamond dye specifically detects phosphoserine, phosphothreonine, and phosphotyrosine-containing proteins.
  • The staining procedure is rapid, reversible, and compatible with MALDI-TOF mass spectrometry.
  • Sensitivity down to 1-2 ng of phosphoprotein was achieved, with signal intensity correlating to phosphorylation levels.
  • Multiplexed proteomics allows parallel quantitative analysis of protein expression and phosphorylation patterns.

Conclusions:

  • Pro-Q Diamond dye technology offers a significant advancement for phosphoprotein detection in proteomics.
  • This technology facilitates the study of cellular regulatory networks and cancer-related signaling.
  • Multiplexed proteomics using Pro-Q Diamond enables comprehensive analysis of protein expression and post-translational modifications.