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Related Experiment Videos

Altered dynamics upon oligomerization corresponds to key functional sites.

Sambit Kumar Mishra1,2, Kannan Sankar1,2, Robert L Jernigan1,2

  • 1Bioinformatics and Computational Biology Program, Iowa State University, Ames, Iowa, 50011.

Proteins
|April 7, 2017
PubMed
Summary

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Protein oligomerization alters dynamics, with some residues becoming more mobile and others less so. Dampened fluctuations in conserved residues suggest key functional roles, explaining why some enzymes require oligomeric structures.

Area of Science:

  • Biophysics
  • Structural Biology
  • Protein Dynamics

Background:

  • Most proteins function as oligomeric complexes, not monomers.
  • Oligomerization impacts protein stability and dynamics.
  • Understanding oligomerization's functional significance is crucial.

Purpose of the Study:

  • Investigate how oligomerization affects protein dynamics.
  • Determine the functional importance of these dynamic changes.
  • Explain why some enzymes require oligomeric forms.

Main Methods:

  • Analysis of 145 multimeric proteins using coarse-grained elastic network models.
  • Comparison of residue fluctuations with evolutionary conservation scores.
  • Examination of residue communities in monomeric and dimeric triosephosphate isomerase.
Keywords:
elastic network modelshomooligomersoligomerizationprotein dynamicsresidue communities

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Main Results:

  • Oligomerization conserves approximately 50% of protein fluctuations.
  • About 25% of residues show increased mobility, while 25% show decreased mobility.
  • Dampened fluctuations in conserved residues correlate with orthosteric binding sites.
  • Significant changes in the catalytic core's dynamical community architecture were observed in dimeric triosephosphate isomerase.

Conclusions:

  • Oligomerization significantly remodels protein dynamics.
  • Conserved, less mobile residues are critical for function, potentially as binding sites.
  • Altered dynamical community architecture in oligomers explains their necessity for certain enzyme functions.