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Updated: Apr 14, 2026
Immunopeptidomics: Isolation of Mouse and Human MHC Class I- and II-Associated Peptides for Mass Spectrometry Analysis
Published on: October 15, 2021
A comprehensive analysis of peptides presented by HLA-A1
K Giam1, R Ayala-Perez, P T Illing
1Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria 3800, Australia; The Department of Biochemistry and Molecular Biology, The Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia.
Insights
Human leukocyte antigen (HLA)-A1, a common Caucasian allele, presents a diverse peptide repertoire. This study identified 4735 naturally processed peptides, revealing HLA-A*01:01
Area of Science:
- Immunology
- Proteomics
Background:
- Human leukocyte antigen (HLA)-A1 is a prevalent HLA-A allele in Caucasian populations.
- Understanding the HLA-A*01:01 ligand repertoire is crucial for immune system research.
Purpose of the Study:
- To comprehensively analyze the naturally processed and presented peptide repertoire of HLA-A*01:01.
- To identify source proteins and characterize the binding motifs of HLA-A*01:01 ligands.
Main Methods:
- Mass spectrometry-based identification of peptides naturally processed and presented by HLA-A*01:01.
- Bioinformatic analysis to determine peptide length, source proteins, and binding motifs.
Main Results:
- Identification of 4735 naturally processed peptides derived from 2477 source proteins.
- HLA-A*01:01 binds peptides of various lengths, with a notable tolerance for longer peptides (11-13 amino acids).
- A conserved binding motif with an acidic residue at P3 and Y at CΩ was observed, even in peptides up to 18 amino acids.
Conclusions:
- The extensive HLA-A*01:01 ligand database provides valuable insights into peptide binding.
- Findings will aid in refining predictive algorithms for peptide binding, especially for longer peptides.
- This research contributes to a deeper understanding of antigen presentation by HLA-A*01:01.
Abstract:
Human leukocyte antigen (HLA)-A1 is one of the most common Caucasian HLA-A alleles. Here, we describe the comprehensive analysis of the HLA-A*01:01 ligand repertoire with the identification of 4735 naturally processed and presented peptides derived from 2477 source proteins. We found HLA-A*01:01 bound an equivalent number of ligands of 9 or 10 amino acids in length as well as being remarkably tolerant of even longer peptides. Indeed close to half of the HLA-A1 bound peptides identified ranged between 11 and 13 amino acids in length. These longer peptides contained the strong canonical motif of and acidic E/D residue at position 3 (P3) and Y at the C-terminus (CΩ), a motif that was still apparent in peptides of up to 18 amino acids in length. The identification of this large database of natural ligands will facilitate the refinement of predictive algorithms particularly with respect to longer peptide ligands.
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