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Peptidomes and Structures Illustrate How SLA-I Micropolymorphism Influences the Preference of Binding Peptide Length

Xiaohui Wei1,2, Shen Li1, Suqiu Wang1

  • 1Department of Microbiology and Immunology, College of Veterinary Medicine, China Agricultural University, Beijing, China.

Frontiers in Immunology
|March 17, 2022
PubMed

Insights

Polymorphisms in swine Major Histocompatibility Complex class I (SLA-I) molecules influence peptide binding length. Structural differences between SLA-1*04:01 and SLA-1*13:01 explain varied peptide length preferences, aiding epitope vaccine design.

Area of Science:

  • Immunology
  • Structural Biology
  • Genetics

Background:

  • Polymorphisms in Major Histocompatibility Complex class I (MHC-I) molecules are known to influence peptide binding.
  • The precise mechanisms by which these polymorphisms affect peptide length preferences remain largely unelucidated.
  • Understanding these mechanisms is crucial for fields like vaccinology and transplantation immunology.

Purpose of the Study:

  • To investigate the impact of sequence homology and polymorphisms on peptide length preferences in swine MHC-I molecules.
  • To elucidate the structural basis for differential peptide binding length preferences between closely related SLA-I alleles.
  • To provide insights for the design of SLA-I-restricted epitope vaccines.

Main Methods:

  • Utilized a random peptide library combined with liquid chromatography-tandem mass spectrometry (LC-MS/MS) and de novo sequencing (RPLD-MS).
  • Determined crystal structures of dodecapeptide (RW12) binding to SLA-1*04:01 and SLA-1*13:01.
  • Performed comparative structural analysis focusing on differential amino acids and peptide binding modes.

Main Results:

  • SLA-1*04:01 and SLA-1*13:01, despite high sequence homology, exhibited significant differences in binding peptide length preferences.
  • SLA-1*13:01 bound fewer short peptides (8-10 amino acids) and more long peptides compared to SLA-1*04:01.
  • Structural analysis revealed distinct binding modes of a dodecapeptide (RW12), with five differential amino acids dictating altered long peptide binding and groove restrictiveness.

Conclusions:

  • Specific amino acid differences in closely related SLA-I molecules can profoundly alter peptide length binding preferences.
  • The structural basis for differential peptide binding is linked to variations in how peptides interact with the binding groove.
  • Findings are valuable for understanding MHC-I polymorphism effects and for developing targeted epitope vaccines.
Keywords:
MHC class Ibinding peptide lengthcrystal structuremicropolymorphismpeptidomes

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