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Protein flexibility facilitates quaternary structure assembly and evolution.

Joseph A Marsh1, Sarah A Teichmann2

  • 1European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, United Kingdom.

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This summary is machine-generated.

Protein flexibility influences how protein subunits assemble into complexes, favoring asymmetric interfaces and promoting the evolution of new protein components. More recent protein subunits are generally more flexible, enabling greater structural diversity.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Evolutionary Biology

Background:

  • Proteins exhibit intrinsic flexibility, enabling conformational changes and assembly into diverse quaternary structures.
  • Understanding how protein flexibility impacts complex formation and evolution is crucial for deciphering cellular mechanisms.

Purpose of the Study:

  • To investigate the influence of protein chain flexibility on the assembly and evolution of protein complexes.
  • To explore the relationship between subunit flexibility, quaternary structure, and evolutionary history.

Main Methods:

  • Analysis of protein complex structures and evolutionary relationships.
  • Correlation studies between subunit flexibility and complex assembly characteristics.

Main Results:

  • Protein flexibility is conducive to forming heterologous (asymmetric) intersubunit interfaces.
  • Increased number of nonhomologous subunits in a complex correlates with higher subunit flexibility.
  • Evolutionarily recent protein subunits are generally more flexible than older subunits.
  • Eukaryotic proteins' increased flexibility facilitates the assembly of heteromeric complexes with unique components.

Conclusions:

  • Subunit flexibility plays a significant role in shaping protein complex quaternary structure and assembly.
  • Protein flexibility is closely linked to the evolutionary trajectory of protein complexes.
  • Flexibility enables greater exploration of quaternary structure space, particularly in eukaryotes.