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Related Experiment Video

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Creating and Applying a Reference to Facilitate the Discussion and Classification of Proteins in a Diverse Group
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Convergent evolution of defensin sequence, structure and function.

Thomas M A Shafee1, Fung T Lay1, Thanh Kha Phan1

  • 1Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, VIC, 3086, Australia.

Cellular and Molecular Life Sciences : CMLS
|August 26, 2016
PubMed
Summary
This summary is machine-generated.

Defensins are diverse antimicrobial peptides found in eukaryotes. Convergent evolution has led to extreme similarities in sequence, structure, and function across defensin superfamilies.

Keywords:
Antimicrobial peptideDisulphide-rich proteinDivergent evolutionEvolutionary constraintEvolvabilityProtein superfamily

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Area of Science:

  • Biochemistry
  • Evolutionary Biology
  • Immunology

Background:

  • Defensins are small, cationic peptides found in all eukaryotes.
  • They exhibit diverse functions, including antimicrobial activity and immune signaling.
  • Defensins belong to two superfamilies (cis- and trans-) with independent evolutionary origins.

Purpose of the Study:

  • To discuss the convergent evolution of defensin superfamilies.
  • To explore the extent, causes, and significance of convergent features in defensins.
  • To provide examples of convergent evolution across eukaryotic defensins.

Main Methods:

  • Comparative analysis of defensin sequences and structures.
  • Examination of evolutionary origins and divergence.
  • Literature review of defensin functions and properties.

Main Results:

  • Defensins display extreme convergent evolution in sequence, structure, and function.
  • Convergent evolution has occurred independently in cis- and trans-defensin superfamilies.
  • The stable, disulphide-rich core facilitates loop display, driving convergent evolution.

Conclusions:

  • Convergent evolution is a significant factor shaping defensin diversity and function.
  • Understanding convergent evolution in defensins provides insights into peptide evolution.
  • Defensins exemplify how evolutionary pressures can lead to similar solutions in unrelated lineages.