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Updated: Oct 31, 2025

Stability and Structure of Bat Major Histocompatibility Complex Class I with Heterologous &#946;2-Microglobulin
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Structural Comparison Between MHC Classes I and II; in Evolution, a Class-II-Like Molecule Probably Came First.

Yanan Wu1, Nianzhi Zhang1, Keiichiro Hashimoto2

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

Frontiers in Immunology
|July 1, 2021
PubMed
Summary
This summary is machine-generated.

Major histocompatibility complex (MHC) class I and class II structures evolved from a class II-type ancestor. This study compares primitive vertebrate MHC structures, revealing conserved features and new functions in MHC class I evolution.

Keywords:
class IMHCb2-microglobulinclass IIevolutionpeptidestructure

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Area of Science:

  • Immunology
  • Evolutionary Biology
  • Structural Biology

Background:

  • Major histocompatibility complex (MHC) class I (pMHC-I) and class II (pMHC-II) complexes present peptides to T cells.
  • pMHC-II complexes consist of IIα and IIβ chains, while pMHC-I complexes comprise a heavy chain (HC) and β2-microglobulin (β2-m).
  • Recent structural studies of primitive vertebrate pMHC-I and pMHC-II complexes provide new insights into their evolution.

Purpose of the Study:

  • To conduct a comprehensive structural comparison of pMHC-I and pMHC-II complexes.
  • To understand the structural evolution of MHC molecules.
  • To support the hypothesis of MHC evolution from class II-type to class I.

Main Methods:

  • Comparative structural analysis of pMHC-I and pMHC-II complexes from primitive vertebrates.
  • Examination of conserved structural features and functional adaptations.
  • Analysis of sequence conservation in peptide-binding domains across divergent species.

Main Results:

  • Extant pMHC-II structures resemble a deduced MHC-II-type homodimer ancestor.
  • Evolution of pMHC-I involved new functions: increased peptide selectivity via a closed groove, enhanced peptide discrimination, and heterotrimer complex formation.
  • Conserved pMHC-I structures include a shifted P1 pocket and a β2-m hydrophobic knob; MHC-I peptide-binding domains show greater sequence conservation than MHC-II.
  • Lungfish genes with fused MHC-IIα and MHC-IIβ domains offer an alternative evolutionary pathway hypothesis.

Conclusions:

  • MHC structural evolution likely proceeded from a class II-type ancestor to class I.
  • Key structural innovations in pMHC-I facilitated enhanced peptide binding and discrimination.
  • Conserved structural elements and sequence conservation patterns support the proposed evolutionary trajectory.