|
エンドウ トシヤ
ENDO TOSHIYA
遠藤 斗志也 所属 京都産業大学 生命科学部 先端生命科学科 職種 客員教授 |
|
| 言語種別 | 英語 |
| 発行・発表の年月 | 1999/07 |
| 形態種別 | 研究論文 |
| 査読 | 査読あり |
| 標題 | Sec-dependent pathway and Delta pH-dependent pathway do not share a common translocation pore in thylakoidal protein transport |
| 執筆形態 | その他 |
| 掲載誌名 | JOURNAL OF BIOLOGICAL CHEMISTRY |
| 出版社・発行元 | AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC |
| 巻・号・頁 | 274(29),pp.20075-20078 |
| 著者・共著者 | T Asai,Y Shinoda,T Nohara,T Yoshihisa,T Endo |
| 概要 | Thylakoidal proteins of plant chloroplasts are transported to thylakoids via several different pathways, including the Delta pH-dependent and the Sec-dependent pathways. In this study, we asked if these two pathways utilize a common translocation pore. A fusion protein consisting of a 23-kDa subunit of the oxygen evolving complex and Escherichia coli biotin carboxyl carrier protein was biotinylated in E. coli cells and purified. When incubated with isolated pea thylakoids in the absence of avidin, the purified fusion protein was imported into the thylakoids via the Delta pH-dependent pathway. However in the presence of avidin, the fusion protein became lodged in the thylakoid membranes, with its N terminus reaching the thylakoidal lumen, while its C-terminal segment complexed with avidin exposed on the thylakoidal surface. The translocation intermediate of the fusion protein inhibited the import of authentic 23-kDa subunit, suggesting that it occupies a putative translocation pore for the Delta pH-dependent pathway. However the intermediate did not block import of the 33-kDa subunit of the oxygen evolving complex, which is a substrate for the Sec-dependent pathway. These results provide evidence against the possibility of a common translocation pore shared by the Sec-dependent pathway and the Delta pH-dependent pathway. |
| ISSN | 0021-9258 |