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Yiğit Kutlu1, Gabriel Axel2, Rachel Kolodny3

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Summary
This summary is machine-generated.

New research suggests protein evolution involves mixing-and-matching sub-domain segments. These "dynamic elements" identified by Gaussian Network Models (GNMs) align with previously found recurring protein "themes," highlighting the role of dynamics in protein evolution.

Keywords:
domainsdynamic elementselastic network modelsevolutionstructural dynamicsthemes

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Area of Science:

  • Structural biology
  • Computational biology
  • Evolutionary biology

Background:

  • Protein evolution often involves combining existing segments, suggesting a modular architecture.
  • The interplay between geometric and dynamic properties is crucial for protein function and evolution.

Purpose of the Study:

  • To investigate if sub-domain level segments, termed "dynamic elements," exhibit evolutionary recurrence similar to larger protein domains.
  • To explore the correlation between dynamic properties and recurring structural motifs in proteins.

Main Methods:

  • Utilized Gaussian Network Models (GNMs) to compute low-frequency modes of motion for 150 protein domains.
  • Decomposed protein domains into "dynamic elements" based on GNM-derived collective motions.
  • Correlated identified dynamic elements with known recurring sub-domain segments ("themes") identified through sequence similarity.

Main Results:

  • A statistically significant correlation was observed between GNM-identified dynamic elements and previously established protein themes.
  • Dynamic elements, representing segments with concerted motions, frequently corresponded to evolutionarily conserved sub-domain structures.
  • This suggests that dynamic properties play a key role in the selection and combination of protein segments during evolution.

Conclusions:

  • Protein evolution likely favors the combination of segments that are compatible both geometrically and dynamically.
  • The findings support a model where proteins evolve from recurring themes that possess favorable dynamic characteristics for function, such as facilitating allosteric regulation.