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Related Experiment Videos

Evolutionary divergence and conservation of trypsin

W R Rypniewski1, A Perrakis, C E Vorgias

  • 1European Molecular Biology Laboratory (EMBL), Hamburg, Germany.

Protein Engineering
|January 1, 1994
PubMed
Summary

This study reveals trypsin

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Area of Science:

  • Biochemistry and Molecular Biology
  • Evolutionary Biology
  • Structural Biology

Background:

  • Trypsin is a crucial digestive enzyme with homologs across diverse life forms.
  • Understanding trypsin's evolutionary trajectory and structural conservation provides insights into enzyme function.

Purpose of the Study:

  • To investigate the evolutionary divergence and structural conservation of trypsin across prokaryotic and eukaryotic organisms.
  • To identify conserved residues critical for trypsin's function.

Main Methods:

  • Collected and aligned available trypsin sequences from databases.
  • Performed sequence homology and structural superposition using crystal structures from cow, Streptomyces griseus, and Fusarium oxysporum.
  • Constructed a phylogenetic tree based on multiple sequence alignment.

Main Results:

  • Phylogenetic analysis indicates continuous evolutionary divergence of trypsin from a common ancestor.
  • Crystal structure comparison shows strict conservation of secondary structures.
  • Sequence alignment reveals insertions/deletions localized to loop regions, preserving secondary structure integrity.
  • Conserved residues are concentrated around the active site, linked to zymogen activation, catalysis, and substrate specificity.
  • Hydrophobic core residues and calcium ion binding sites exhibit less conservation.

Conclusions:

  • Trypsin's evolution demonstrates a conserved core structure with functional adaptations.
  • Key functional sites, including the active site, are highly conserved, underscoring their importance.
  • Non-essential regions, like the hydrophobic core, show greater variability, allowing for evolutionary flexibility.

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