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Related Experiment Video

Updated: Jan 26, 2026

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From Rhesus macaque to human: structural evolutionary pathways for immunoglobulin G subclasses.

William David Tolbert1,2, Ganesh Prasad Subedi3, Neelakshi Gohain1

  • 1a Division of Vaccine Research , Institute of Human Virology of University of Maryland School of Medicine , Baltimore , MD , USA.

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|April 4, 2019
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Summary

Rhesus macaque IgG Fc domains show less structural diversity than human IgGs, limiting their use in disease modeling. Only rhesus macaque IgG1 matches human IgG1 and IgG3 properties for Fcγ receptor interactions.

Keywords:
FcIgG subclassesMacaca mulattaRhesus macaquecrystallizable fragment

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Area of Science:

  • Immunology
  • Structural Biology
  • Primate Models

Background:

  • Rhesus macaques (Macaca mulatta, Mm) are common primate models for human diseases and vaccine development.
  • Despite 93% genome identity, differences in adaptive immune genes, including IgG subclasses and Fcγ receptors, limit Mm utility.
  • These molecular disparities affect Fc-mediated functions and interactions with effector cells.

Purpose of the Study:

  • To comprehensively analyze the molecular properties of Rhesus macaque IgG Fc domains.
  • To describe potential mechanisms for their interactions with effector cell Fc receptors.
  • To compare structural and functional characteristics with human IgG subclasses.

Main Methods:

  • Structural analysis of the Fc domain of the four Rhesus macaque IgG subclasses.
  • Comparison of molecular properties with human IgG subclasses.
  • Analysis of Fcγ receptor and neonatal receptor interactions.

Main Results:

  • Rhesus macaque IgG Fc domains exhibit less structural diversity compared to human IgGs.
  • MmIgG1 Fc is structurally similar to human IgG3, with comparable CH2 loops and N297 glycan mobility to human IgG1.
  • MmIgG3 and MmIgG4 Fcs lack structural features crucial for human IgG3/IgG4 functions like neonatal receptor interaction and Fab-arm exchange.

Conclusions:

  • Rhesus macaque IgG subclasses are less structurally divergent than human IgGs.
  • Only MmIgG1 possesses molecular properties aligning with human IgG1 and IgG3, the most potent in Fcγ receptor binding and Fc-mediated functions.
  • Structural differences necessitate careful consideration when using Rhesus macaques as models for human IgG-mediated immunity.