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Developing an iMALDI method.

Brinda Shah1, Jennifer D Reid, Michael A Kuzyk

  • 1University of Victoria-Genome British Columbia Proteomics Centre, University of Victoria, Victoria, BC, Canada.

Methods in Molecular Biology (Clifton, N.J.)
|June 15, 2013
PubMed
Summary
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Immuno-MALDI (iMALDI) offers highly specific peptide and protein detection using affinity capture and mass spectrometry. This sensitive technique identifies target peptides by molecular weight and amino acid sequence, even at low-attomole levels.

Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Immunology

Background:

  • Traditional methods for peptide and protein quantification can lack specificity.
  • There is a need for sensitive and specific techniques to detect target molecules in complex samples.

Purpose of the Study:

  • To describe the immuno-MALDI (iMALDI) technique for sensitive and specific peptide and protein analysis.
  • To demonstrate the application of iMALDI for detecting target peptides in various sample types.

Main Methods:

  • Affinity capture of target peptides from enzymatic digests using specific antibodies.
  • Direct analysis of captured peptides on a MALDI target using MALDI-MS and MALDI-MS/MS.
  • Quantification using stable-isotope-labeled standard peptides (SIS peptides).

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Main Results:

  • iMALDI provides high specificity by determining both molecular weight (MALDI-MS) and amino acid sequence (MALDI-MS/MS).
  • The technique can detect low-attomole levels of target peptides in environmental samples and human plasma digests.
  • Demonstrated successful application in detecting a bioterrorism threat organism and human EGFR isoforms.

Conclusions:

  • iMALDI is a powerful technique for highly specific and sensitive detection of peptides and proteins.
  • The method allows for precise quantification through the use of SIS peptides.
  • iMALDI has broad applicability in fields such as environmental monitoring and clinical diagnostics.