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A Novel 3.5 kDa Protein Component of Cyanobacterial Photosystem I Complexes |
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| Authors: | Ikeuchi Masahiko; Sonoike Kintake; Koike Hiroyuki; Pakrasi Himadri B; Inoue Yorinao |
| Institution: | 1 Solar Energy Research Group, The Institute of Physical and Chemical Research (RIKEN) Wako, Saitama, 351-01 Japan 2 Department of Botany, Faculty of Science, University of Tokyo Bunkyo-ku, Tokyo, 113 Japan 3 Department of Life Science, Faculty of Science, Himeji Institute of Technology Harima Science Park City, Hyogo, 678-12 Japan 4 Department of Biology, Washington University Box 1137, St. Louis, MO 63130-4899, U.S.A. |
| Abstract: | A novel protein component of 3.5 kDa was detected in photosystemI complexes prepared from several cyanobacteria, viz. Synechococcusvulcanus, Synechococcus elongotus BP-1, Synechococcus sp. FCC7002 and Synechocystis sp. FCC 6803. The complete amino acidsequence of this component was determined by direct proteinsequencing. The sequences of the 3.5 kDa proteins from thesefour organisms were highly homologous to each other, featuringa hydrophobic domain in the middle. The cyanobacterial consensussequence exhibits significant homology to the presumed productof ORF32 in the chloroplast DNA of liverwort (Marchantia polymorpha),but no homologous ORF is present in the chloroplast DNA of tobaccoor rice. Since this protein appears to interact strongly withthe PS I reaction center complex, it may play some role in thefunction and maintenance of the structure of PS I. (Received May 25, 1992; Accepted August 18, 1992) |
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