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Insights into the evolution of the antenna domains of Type‐I and Type‐II photosynthetic reaction centres through homology modelling
Author(s) -
Fyfe Paul K,
Jones Michael R,
Heathcote Peter
Publication year - 2002
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(02)03436-1
Subject(s) - photosynthetic reaction centre , bacteriochlorophyll , antenna (radio) , photosystem ii , chemistry , photosynthesis , homology (biology) , stereochemistry , amino acid , biochemistry , computer science , telecommunications
The (bacterio)chlorophylls of photosynthetic antenna and reaction centre complexes are bound to the protein via a fifth, axial ligand to the central magnesium atom. A number of the amino acids identified as providing such ligands are conserved between the large antenna of the cyanobacterial Type‐I reaction centre and smaller antennas of the Type‐I reaction centres of green sulphur bacteria and heliobacteria, and these numbers match closely the estimated number of antenna bacteriochlorophylls in the latter. The possible organisation of the antenna in the latter reaction centres is discussed, as is the mechanism by which the more pigment‐rich antenna of the cyanobacterial reaction centre evolved. The homology modelling approach is also extended to the six‐helix antenna proteins CP47 and CP43 associated with the Photosystem II reaction centre.