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Structural and evolutionary determinants of Argonaute function.

Arndt Wallmann1, Mathew Van de Pette1,2

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Argonaute proteins, essential for gene regulation, evolved diverse functions while maintaining a conserved structure. This study traces their evolutionary path, revealing key molecular features linked to new biological roles.

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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Genetics

Background:

  • Argonaute proteins are crucial for post-transcriptional and epigenetic regulation.
  • Despite diverse functions, their structural fold is highly conserved across life.
  • Evolutionary pathways of Argonaute functional diversification remain incompletely understood.

Purpose of the Study:

  • To investigate the evolutionary trajectory of Argonaute proteins.
  • To identify conserved and clade-specific features underlying Argonaute structure and function.
  • To understand how Argonaute functions diversified through evolution.

Main Methods:

  • Comparative analysis of Argonaute proteins across diverse lineages and evolutionary timescales.
  • Integration of structural, sequence, phylogenetic, and disease mutation data.
  • Identification of sequence signatures and intra-protein contact networks.

Main Results:

  • Identified universal and clade-specific sequence signatures and contact networks.
  • Characterized features of the Argonaute structural fold, nucleic acid interface, and binding sites.
  • Analyzed the impact of disease mutations and alterations in Argonaute-like Med13.

Conclusions:

  • Argonaute functional diversification is associated with the emergence of conserved molecular features.
  • Evolutionary analysis provides insights into how Argonaute proteins adapted to new biological roles.
  • Understanding Argonaute evolution aids in deciphering complex gene regulation systems.