Identification of Photosystem I components from a glaucocystophyte,Cyanophora paradoxa: The PsaD protein has an N-terminal stretch homologous to higher plants |
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Authors: | Koike Hiroyuki Shibata Mari Yasutomi Kanako Kashino Yasuhiro Satoh Kazuhiko |
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Institution: | (1) Department of Life Science, Faculty of Science, Himeji Institute of Technology, Harima Science Garden City, Hyogo 678-1297, Japan;(2) Department of Life Science, Faculty of Science, Himeji Institute of Technology, Harima Science Garden City, Hyogo 678-1297, Japan |
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Abstract: | Thylakoid membranes and Photosystem I (PS I) complexes were isolated from a glaucocystophyte, Cyanophora paradoxa, which is thought to have the most primitive ‘plastids’, and the proteins related to PS I were examined. The intrinsic light-harvesting
chlorophyll protein complexes of PS I (LHC I) were not detected by an immunological method. The PS I complexes consisted of
at least eight low-molecular-mass proteins in addition to PS I reaction center proteins. The N-terminal sequence of the PsaD
protein has higher homology to that of Chlamydomonas reinhardtii and land plants, than to that of other algae or cyanobacteria. On the other hand, the PsaL sequence has the highest homology
to those of cyanobacteria. Taking into account the other sequences of PS I components whose genes are encoded in the cyanelle
genome, and the fact that LHC I is not detected, it is concluded that PS I of C. paradoxa has chimeric characteristics of both ‘green’ lineages and cyanobacteria.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | Cyanophora paradoxa glaucocystophyte light harvesting complex Photosystem I PsaD PsaL |
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