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Small-angle scattering reveals major light-harvesting complex II (LHCII) solution structures. Detergent choice influences LHCII aggregation, with one preparation forming a novel trimer-of-trimers complex important for photoprotection.

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Area of Science:

  • Biophysics
  • Photosynthesis research
  • Structural biology

Background:

  • The crystal structure of major light-harvesting complex II (LHCII) is crucial for understanding its functions.
  • LHCII's structure in solution and its aggregation state can differ from crystal structures.
  • Functional states influence LHCII's oligomerization.

Purpose of the Study:

  • Investigate the solution structures of solubilized LHCII using small-angle scattering.
  • Compare the structural behavior of LHCII prepared with different detergents (OG and β-DM).
  • Elucidate the oligomeric states of LHCII relevant to its photoprotective functions.

Main Methods:

  • Small-angle scattering (SAS) experiments.
  • Solubilization of LHCII using nonionic detergents n-octyl-β-d-glucoside (OG) and n-dodecyl-β-D-maltoside (β-DM).
  • Analysis of structural data in aqueous solution at physiological temperatures.

Main Results:

  • The LHCII-OG complex in solution matches the known trimeric crystal structure.
  • A novel, stable oligomer of three LHCII trimers was observed for the LHCII-β-DM preparation.
  • This trimer-of-trimers complex suggests additional pigment-pigment interactions.

Conclusions:

  • Detergent choice significantly impacts LHCII solution structure and oligomerization.
  • The observed trimer-of-trimers complex may mimic in vivo trimer-trimer interactions.
  • These findings provide insights into the structural basis of photoprotective nonphotochemical quenching in LHCII.