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Excitation energy trapping in photosystem I complexes depleted in Lhca1 and Lhca4
Author(s) -
Ihalainen Janne A.,
Klimmek Frank,
Ganeteg Ulrika,
van Stokkum Ivo H.M.,
van Grondelle Rienk,
Jansson Stefan,
Dekker Jan P.
Publication year - 2005
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/j.febslet.2005.06.091
Subject(s) - photosystem ii , photosystem i , chemistry , energy transfer , fluorescence , photochemistry , biophysics , p700 , photosystem , spectroscopy , trapping , photosynthesis , chemical physics , biochemistry , physics , biology , optics , ecology , quantum mechanics
We report a time‐resolved fluorescence spectroscopy characterization of photosystem I (PSI) particles prepared from Arabidopsis lines with knock‐out mutations against the peripheral antenna proteins of Lhca1 or Lhca4. The first mutant retains Lhca2 and Lhca3 while the second retains one other light‐harvesting protein of photosystem I (Lhca) protein, probably Lhca5. The results indicate that Lhca2/3 and Lhca1/4 each provides about equally effective energy transfer routes to the PSI core complex, and that Lhca5 provides a less effective energy transfer route. We suggest that the specific location of each Lhca protein within the PSI–LHCI supercomplex is more important than the presence of so‐called red chlorophylls in the Lhca proteins.