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Peptide Identification Using Tandem Mass Spectrometry

Peptide Identification Using Tandem Mass Spectrometry

Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...

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Immunopeptidomics: Isolation of Mouse and Human MHC Class I- and II-Associated Peptides for Mass Spectrometry Analysis

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The HLA-B*2705 peptidome.

Lilach Ben Dror¹, Eilon Barnea, Ilan Beer

¹Technion-Israel Institute of Technology, Haifa, Israel.

Arthritis and Rheumatism

|January 30, 2010

Summary

Researchers analyzed HLA-B27 peptides to find links between bacterial infections and spondylarthritides (SpA). They identified human cartilage peptides similar to bacterial sequences, suggesting a molecular mimicry mechanism in SpA development.

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Area of Science:

Immunology
Molecular Biology
Biochemistry

Background:

The HLA-B27 allele is a significant genetic factor associated with spondylarthritides (SpA).
Understanding the molecular interactions involving HLA-B27 is crucial for elucidating SpA pathogenesis.
Potential molecular mimicry between self-antigens and microbial antigens is a proposed mechanism in autoimmune diseases.

Purpose of the Study:

To conduct a comprehensive biochemical analysis of the HLA-B*2705 peptidome.
To identify potential molecular mimicry between HLA-B27-bound peptides from cartilage proteins and bacterial sequences.
To refine the binding motif of the HLA-B27 allele.

Main Methods:

Recombinant expression of soluble HLA-B27 molecules from chondrocytic and HeLa cells.
Peptide recovery using capillary chromatography and tandem mass spectrometry.
Stable isotope labeling (SILAC) and iTRAQ chemical labeling for enhanced data accuracy.

Main Results:

Identification of over 1,268 HLA-B27-bound peptides, with 569 confirmed at high confidence.
Refinement of the HLA-B27 binding motif, allowing prediction of short and long peptides.
Discovery of human B27 peptide sequences from cartilage proteins exhibiting similarity to bacterial sequences.

Conclusions:

The identified peptides may represent the crucial link between bacterial infections and the development of SpA.
Molecular mimicry involving HLA-B27 and bacterial antigens is a plausible mechanism in SpA pathogenesis.
This study provides a refined understanding of the HLA-B27 peptidome and its implications for inflammatory diseases.