Identification of a chloroplast-encoded 9-Kda polypeptide as a 2[4Fe-4S] protein carrying center-A and center-B of photosystem-I

Høj, Peter Bordier, Svendsen, Ib, Scheller, Henrik Vibe and Møller, Birger Lindberg (1987) Identification of a chloroplast-encoded 9-Kda polypeptide as a 2[4Fe-4S] protein carrying center-A and center-B of photosystem-I. Journal of Biological Chemistry, 262 26: 12676-12684.

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Author Høj, Peter Bordier
Svendsen, Ib
Scheller, Henrik Vibe
Møller, Birger Lindberg
Title Identification of a chloroplast-encoded 9-Kda polypeptide as a 2[4Fe-4S] protein carrying center-A and center-B of photosystem-I
Journal name Journal of Biological Chemistry   Check publisher's open access policy
ISSN 0021-9258
Publication date 1987-09-15
Sub-type Article (original research)
Open Access Status File (Publisher version)
Volume 262
Issue 26
Start page 12676
End page 12684
Total pages 9
Place of publication Bethesda, MD, United States
Publisher American Society for Biochemistry and Molecular Biology
Language eng
Abstract An improved procedure is reported for large-scale preparation of photosystem I (PS-I) vesicles from thylakoid membranes of barley (Hordeum vulgare L.). The PS-I vesicles contain polypeptides of molecular masses 82, 18, 16, 14, and 9 kDa in an apparent molar ratio of 4:2:2:1:2. The 18-, 16-, and 9-kDa polypeptides were purified to homogeneity after exposure of the PS-I vesicles to chaotropic agents. The isolated 9-kDa polypeptide binds 65-70% of the zero-valence sulfur of denatured PS-I vesicles, and the remaining 30-35% is bound to P700-chlorophyll a-protein 1. The N-terminal amino acid sequence (29 residues) of the 9-kDa polypeptide was determined. Comparison with the nucleotide sequence of the chloroplast genome of Marchantia polymorpha (Ohyama, K., Fukuzawa, H., Kohchi, T., Shirai, H., Sano, T., Sano, S., Umesono, K., Shiki, Y., Takeuchi, M., Chang, Z., Aota, S.-i., Inokuchi, H., and Ozeki, H. (1986) Nature 322, 572-574) and of Nicotiana tabacum (Shinozaki, K., Ohme, M., Tanaka, M., Wakasugi, T., Hayashida, N., Matsubayashi, T., Zaita, W., Chunwongse, J., Obokata, J., Yamaguchi-Shinozaki, K., Ohto, C., Torazawa, K., Meng, B. Y., Sugita, M., Deno, H., Kamogashira, T., Yamada, K., Kusuda, J., Takaiwa, F., Kato, A., Tohdoh, N., Shimada, H., and Sugiura, M. (1986) EMBO J. 5, 2043-2049) identified the chloroplast gene encoding the 9-kDa polypeptide. We designate this gene psaC. The complete amino acid sequence deduced from the psaC gene identifies the 9-kDa PS-I polypeptide as a 2[4Fe-4S] protein. Since P700-chlorophyll a-protein 1 carries center X, the 9-kDa polypeptide carries centers A and B. A hydropathy plot permits specific identification of the cysteine residues which coordinate centers A and B, respectively. Except for the loss of the N-terminal methionine residue, the primary translation product of the psaC gene is not proteolytically processed. P700-chlorophyll a-protein 1 binds 4 iron atoms and 4 molecules of acid-labile sulfide/molecule of P700. Each of the two apoproteins of P700-chlorophyll a-protein 1 contains the sequence Phe-Pro-Cys-Asp-Gly-Pro-Gly-Arg-Gly-Gly-Thr-Cys (Fish, L. E., Kück, U., and Bogorad, L. (1985) J. Biol. Chem. 260, 1413-1421). The stoichiometry of the component polypeptides of PS-I indicates the presence of four copies of this sequence per molecule of P700. Center X may be composed of two [2Fe-2S] centers bound to the 8 cysteine residues contained in these four segments.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Office of the Vice-Chancellor
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