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Teodor Silviu Balaban1, Paula Braun, Christof Hättig

  • 1Karlsruhe Institute of Technology, Forschungszentrum Karlsruhe, Institute for Nanotechnology, Karlsruhe, Germany. silviu.balaban@int.fzk.de

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Chlorophylls (Chls) exhibit alpha and beta configurations influencing light-harvesting. Beta-ligated Chls form special dimers, guiding excitation energy transfer in photosystems I and II.

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Area of Science:

  • Photosynthesis research
  • Biophysical chemistry
  • Structural biology

Background:

  • Chlorophylls (Chls) are central to light-harvesting in photosynthetic organisms.
  • The magnesium atom in Chls can adopt alpha or beta configurations due to axial ligation.
  • The alpha configuration is generally more stable and frequent than the beta configuration.

Purpose of the Study:

  • To investigate the structural and energetic implications of the alpha/beta dichotomy in chlorophylls within photosystems I and II.
  • To understand the role of beta-ligated chlorophylls in excitation energy transfer pathways.

Main Methods:

  • Analysis of high-resolution crystal structures of photosystems I and II.
  • Ab initio calculations using the CC2 model to predict absorption spectra.
  • Statistical analysis of protein-Chl contacts.

Main Results:

  • Identified specific numbers of beta-configured Chls in photosystem II (9 definitively, 4 uncertain out of 35).
  • Calculations showed minor spectral differences between alpha and beta configurations with histidine ligands.
  • Significant red shifts were observed in excitonically coupled beta-beta-Chl dimers, found in both photosystems and bacterial LH2 complexes.
  • Distinct protein-Chl contacts were observed for alpha and beta configurations.

Conclusions:

  • Beta-ligated chlorophylls, particularly in beta-beta dimers, play a crucial role in directing excitation energy transfer.
  • Structural preferences for beta-ligated Chls create preferential pathways for energy transfer towards reaction centers.
  • This study elucidates the functional significance of chlorophyll stereochemistry in light-harvesting efficiency.