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Structural characterization and evolutionary analysis of fish-specific TLR27.

Jinlan Wang1, Zheng Zhang2, Jing Liu1

  • 1Institute of Developmental Biology, School of Life Science, Shandong University, Jinan 250100, PR China.

Fish & Shellfish Immunology
|June 21, 2015
PubMed
Summary

Toll-like receptors (TLRs) are key to fish immunity. TLR27, highly conserved in fish, features a unique structure for recognizing ligands, crucial for innate immune responses.

Keywords:
Innate immunityMolecular evolutionPAMPsStructural characteristicsToll-like receptor 27

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Area of Science:

  • Immunology
  • Evolutionary Biology
  • Structural Biology

Background:

  • Toll-like receptors (TLRs) are vital for innate immunity in fish.
  • TLR family 1 members, including TLR27, play significant roles in immune responses.

Purpose of the Study:

  • To investigate the evolutionary and structural characteristics of fish TLR27.
  • To understand the potential ligand-binding mechanisms of TLR27.

Main Methods:

  • Phylogenetic analysis of TLR27 across three fish species.
  • Structural modeling of the TLR27 ectodomain.
  • Evolutionary analysis using dN/dS ratios.

Main Results:

  • Phylogenetic analysis placed TLR27 within TLR family 1, clustering with TLR14/18 and TLR25.
  • Structural modeling revealed a unique hydrophobic pocket in the TLR27 ectodomain, likely involved in ligand recognition.
  • Evolutionary analysis indicated strong negative selection pressure on TLR27, signifying high conservation.

Conclusions:

  • Fish TLR27 is highly conserved due to significant negative selection.
  • The identified structural features suggest a critical role for TLR27 in fish innate immunity and ligand recognition.