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Lhca5 interaction with plant photosystem I
Author(s) -
Lucinski Robert,
Schmid Volkmar H.R.,
Jansson Stefan,
Klimmek Frank
Publication year - 2006
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.2006.10.063
Subject(s) - photosystem i , photosystem ii , arabidopsis , biophysics , photosynthesis , photosystem , chemistry , p700 , cytochrome b6f complex , light harvesting complex , biology , biochemistry , gene , mutant
In the outer antenna (LHCI) of higher plant photosystem I (PSI) four abundantly expressed light‐harvesting protein of photosystem I (Lhca)‐type proteins are organized in two heterodimeric domains (Lhca1/Lhca4 and Lhca2/Lhca3). Our cross‐linking studies on PSI‐LHCI preparations from wildtype Arabidopsis and pea plants indicate an exclusive interaction of the rarely expressed Lhca5 light‐harvesting protein with LHCI in the Lhca2/Lhca3‐site. In PSI particles with an altered LHCI composition Lhca5 assembles in the Lhca1/Lhca4 site, partly as a homodimer. This flexibility indicates a binding‐competitive model for the LHCI assembly in plants regulated by molecular interactions of the Lhca proteins with the PSI core.