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The role of axial ligands for the structure and function of chlorophylls

  • Jimmy Heimdal
  • Kasper P. Jensen
  • Ajitha Devarajan
  • Ulf Ryde
Original Paper

Abstract

We have studied the effect of axial ligation of chlorophyll and bacteriochlorophyll using density functional calculations. Eleven different axial ligands have been considered, including models of histidine, aspartate/glutamate, asparagine/glutamine, serine, tyrosine, methionine, water, the protein backbone, and phosphate. The native chlorophylls, as well as their cation and anion radical states and models of the reaction centres P680 and P700, have been studied and we have compared the geometries, binding energies, reduction potentials, and absorption spectra. Our results clearly show that the chlorophylls strongly prefer to be five-coordinate, in accordance with available crystal structures. The axial ligands decrease the reduction potentials, so they cannot explain the high potential of P680. They also redshift the Q band, but not enough to explain the occurrence of red chlorophylls. However, there is some relation between the axial ligands and their location in the various photosynthetic proteins. In particular, the intrinsic reduction potential of the second molecule in the electron transfer path is always lower than that of the third one, a feature that may prevent back-transfer of the electron.

Keywords

Chlorophyll Photosynthesis Axial ligands Density functional theory Reduction potential 

Abbreviations

Backb

Amino acid backbone

BChl

Bacteriochlorophyll

BDE

Bond dissociation energy

BP86

Becke’s 1988 gradient corrected exchange functional, combined with Perdew’s 1986 correlation functional

Chl

Chlorophyll

COSMO

Conductor-like screening model

LHC

Light-harvesting complex

Pheo

Pheophytin

Phos

Phosphate

PSI

Photosystem I

PSII

Photosystem II

RC

Reaction centre

RI

Resolution-of-the-identity approximation

Notes

Acknowledgements

This investigation was supported by grants from the Swedish Research Council and by computer resources of Lunarc at Lund University.

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Copyright information

© SBIC 2006

Authors and Affiliations

  • Jimmy Heimdal
    • 1
  • Kasper P. Jensen
    • 1
  • Ajitha Devarajan
    • 1
  • Ulf Ryde
    • 1
  1. 1.Department of Theoretical ChemistryLund University, Chemical CentreLundSweden

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