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Functional evolution within a protein superfamily.

Zhengping Yi1, Olga Vitek, M A Qasim

  • 1Department of Chemistry, Purdue University, West Lafayette, Indiana, USA.

Proteins
|February 8, 2006
PubMed
Summary
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Kazal inhibitor superfamily evolution reveals avian ovomucoid third domains are optimized to inhibit serine proteinases, unlike first domains. Functional conservation, not just specific residues, drives this evolutionary adaptation.

Area of Science:

  • Biochemistry
  • Protein Engineering
  • Evolutionary Biology

Background:

  • Protein families and superfamilies exhibit functional evolution.
  • Predicting reactivity distributions aids in understanding protein evolution.

Purpose of the Study:

  • To analyze functional evolution within the Kazal inhibitor superfamily.
  • To compare predicted association free energy distributions of Kazal inhibitors against serine proteinases.

Main Methods:

  • Analysis of predicted association free energy distributions.
  • Comparison across different Kazal inhibitor groups (all, avian ovomucoid first/third domains, weighted residue combinations).
  • Statistical analysis of residue hypervariability and conservation.

Main Results:

Related Experiment Videos

  • Avian ovomucoid third domains evolved to inhibit target serine proteinases, while first domains did not.
  • Residue hypervariability at binding sites is compensated by similar energetic contributions from various residue types.
  • Conservation is observed in functionality, with frequent selection of beneficial residues.

Conclusions:

  • Kazal inhibitor evolution prioritizes functional inhibition across multiple enzymes over maximal inhibition against a single target.
  • Proteinase-binding site hypervariability is a mechanism for maintaining functional conservation.
  • Nature optimizes for a balance of inhibitory strength and broad applicability.