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Conserved energetic changes drive function in an ancient protein fold.

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Summary
This summary is machine-generated.

Protein folds are conserved, but their energetic blueprints diverge. This study shows how the same protein fold can adapt distinct functions through evolved energetic networks, even with similar triggers.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Evolutionary Biology

Background:

  • Protein folds, conserved 3D structures, are abundant in nature.
  • Despite structural similarity, protein folds can perform diverse functions.
  • The evolutionary conservation of protein folds may relate to maintaining function-driving energetic changes.

Purpose of the Study:

  • Investigate if key energetic relationships are conserved within protein families.
  • Determine if structural homologs with similar functions share conserved energetic blueprints.
  • Explore how protein folds adapt to different functions via specific energetic requirements.

Main Methods:

  • High-resolution hydrogen exchange/mass spectrometry
  • Bioinformatics analysis
  • X-ray crystallography
  • Molecular dynamics simulations

Main Results:

  • Bacterial transcription factors (TFs) and periplasmic binding proteins (PBPs), despite sharing a fold, exhibit distinct energetic blueprints.
  • The allosteric network in TFs evolved for genome regulation, differing from PBP interactions with membrane transport.
  • The same protein fold can support distinct sense/response functions through family-specific energetic adaptations.

Conclusions:

  • Protein fold conservation does not necessitate conserved energetic blueprints.
  • Family-specific energetic requirements drive the adaptation of protein folds for diverse functions.
  • Understanding conserved energetic blueprints aids in designing novel proteins and addressing disease-related drug targets.