Cross-kymography analysis to simultaneously quantify the function and morphology of the archaellum
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- Kinosita Yoshiaki
- Department of Physics, Gakushuin University Present address: Institute for Biology II, Freiburg University, Germany
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- Nishizaka Takayuki
- Department of Physics, Gakushuin University
抄録
<p>In many microorganisms helical structures are important for motility, e.g., bacterial flagella and kink propagation in Spiroplasma eriocheiris. Motile archaea also form a helical-shaped filament called the ‘archaellum’ that is functionally equivalent to the bacterial flagellum, but structurally resembles type IV pili. The archaellum motor consists of 6–8 proteins called fla accessory genes, and the filament assembly is driven by ATP hydrolysis at catalytic sites in FlaI. Remarkably, previous research using a dark-field microscopy showed that right-handed filaments propelled archaeal cells forwards or backwards by clockwise or counterclockwise rotation, respectively. However, the shape and rotational rate of the archaellum during swimming remained unclear, due to the low signal and lack of temporal resolution. Additionally, the structure and the motor properties of the archaellum and bacterial flagellum have not been precisely determined during swimming because they move freely in three-dimensional space. Recently, we developed an advanced method called “cross-kymography analysis”, which enables us to be a long-term observation and simultaneously quantify the function and morphology of helical structures using a total internal reflection fluorescence microscope. In this review, we introduce the basic idea of this analysis, and summarize the latest information in structural and functional characterization of the archaellum motor.</p>
収録刊行物
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- Biophysics and Physicobiology
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Biophysics and Physicobiology 15 (0), 121-128, 2018
一般社団法人 日本生物物理学会
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詳細情報 詳細情報について
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- CRID
- 1390282680739904000
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- NII論文ID
- 130006733966
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- ISSN
- 21894779
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可