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Structural plasticity enables evolution and innovation of RuBisCO assemblies.

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Researchers explored the evolution of protein assemblies, specifically Ribulose-1,5-bisphosphate carboxylase-oxygenase (RuBisCO). They discovered how structural changes drive new oligomeric states, offering insights into protein evolution and engineering.

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Area of Science:

  • Protein structure and evolution
  • Biochemistry and molecular biology
  • Enzyme function and regulation

Background:

  • Protein oligomerization is crucial for molecular complex formation and function.
  • Evolutionary studies of protein assembly diversity are limited.
  • Ribulose-1,5-bisphosphate carboxylase-oxygenase (RuBisCO) exhibits diverse oligomeric states with unclear evolutionary origins.

Purpose of the Study:

  • To investigate the evolutionary trajectory of RuBisCO oligomerization.
  • To understand the structural basis for the interconversion of RuBisCO oligomeric states.
  • To explore the potential for engineering novel oligomeric states through targeted mutations.

Main Methods:

  • Phylogenetic analysis of ancestral and extant form II RuBisCO sequences.
  • X-ray crystallography to determine the structure of a novel tetrameric RuBisCO.
  • Site-directed mutagenesis to engineer changes in RuBisCO oligomerization.

Main Results:

  • A complex and diverse evolutionary history of RuBisCO oligomerization was revealed.
  • A novel tetrameric RuBisCO structure demonstrated how surface interactions facilitate oligomeric state changes.
  • Engineering RuBisCO with few mutations successfully altered its oligomerization.

Conclusions:

  • Structural plasticity enables the emergence of new protein oligomeric states during evolution.
  • Understanding RuBisCO's oligomerization provides insights into enzyme adaptation and engineering.
  • The study highlights the dynamic nature of protein quaternary structures and their evolutionary adaptability.