2005 Fiscal Year Final Research Report Summary
Study on the molecular mechanism of endosymbiosis based on the genomic information of Buchnera
| Project/Area Number |
16570110
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Functional biochemistry
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| Research Institution | The University of Tokyo |
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Principal Investigator |
MORIOKA Mizue The University of Tokyo, Graduate School of Science, Assistant Professor, 大学院理学系研究科, 助手 (20272461)
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| Co-Investigator(Kenkyū-buntansha) |
SASAKI Tetsuhiko Tamagawa University, Research Institute, Associate Professor, 学術研究所, 助教授 (60235257)
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| Project Period (FY) |
2004 – 2005
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| Keywords | Symbiosis / Buchnera / Flagellar / Hook-Basal Body Complex / Protein traffic |
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| Research Abstract |
Based on the genomic information of Buchnera, the mechanism of the protein transport in an aphid endosymbiotic system was analyzed from the aspects of molecular biology and cellular biology, and following results were obtained.
1. It was found that the Buchnera 26 flagellar genes are not pseudogenes but all of them are actively transcribed and translated. Furthermore, electron microscopic observation revealed that the Buchnera surface is completely covered with thousands flagellum hook and basal body complexes (HBB). Analyses are planned to investigate the relation of the expression of flagellar genes and proteins to the developmental stages of host insects or morphogenesis.
2. In the course of the present study, we discovered that in alatae immediately after the final ecdysis, the number of Buchnera was decreased drastically, and also the hematoxylin-staining image of Buchnera was entirely different from that in apterae, suggesting that the localization of Buchnera DNA in alatae and apterae may be different.
3. As a preliminary experiment to prove the possibility that HBB functions as the protein transport machinery, isolated Buchnera were incubated with a fluorescent labeled substance and observed under a confocal microscope. Since the fluorescence was detected in Buchnera, construction of an in vitro assay system for protein transport was evaluated to be successful.
4. Several proteins which appeared to be imported from the host bacteria cells into Buchnera have been identified through proteome analysis. In the present investigation, it was the most important task to determine whether a "Buchnera targeting signal peptide" that is in common for these proteins exists or not. However, since the genome project for aphid is incomplete, our investigation has to be terminated. The results obtained in the present investigation will contribute in elucidating the mechanism of the protein transport mechanism, which is hitherto unknown, in a bacteriocyte endosymbiotic system.
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Research Products
(2 results)
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[Journal Article] Hundreds of the flagellar basal bodies cover the cell surface of the endosymbiotic bacterium Buchnera sp. APS.
Author(s)
Maezawa, K, Shigenobu, S., Taniguchi, H., Kubo, T., Aizawa, S-L, Morioka, M.
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Journal Title
Journal of Bacteriology (in press)
Description
「研究成果報告書概要(欧文)」より
