染色適応センサのフィトクロームとエチレン受容体との類似性
1Department of Plant Biology, Carnegie Institution of Washington, 290 Panama Street, Stanford, CA 94305, USA.
Science (New York, N.Y.)
|September 6, 1996
まとめ
サイアノバクテリアは,光採集複合生物合成を制御するために,補完的な色素適応のための光受容体を使用します. 新しく特定された遺伝子であるrcaEは,FdBk変異体におけるこの光質感知メカニズムにとって極めて重要です.
科学分野:
- 微生物学 微生物学とは
- 光合成に関する研究.
- 分子生物学は分子生物学である.
背景:
- サイアノバクテリアは,補完的な染色体適応 (CCA) を表し,光質への反応として光採集複合生物合成を調節するプロセスである.
- この適応は光受容体によって媒介されるが,正確な感知メカニズムはまだ完全に理解されていない.
研究 の 目的:
- サイアノバクテリア変異体FdBkが補完的な染色体適応を行うことができない遺伝的根拠を特定する.
- CCAのための光の質を感知する分子成分を明らかにする.
主な方法:
- FdBk変異体の遺伝的補完.
- 補完遺伝子の配列分析. 補完遺伝子の配列分析. 補完遺伝子の配列分析. 補完遺伝子の配列分析. 補完遺伝子の配列分析. 補完遺伝子の配列分析. 補完遺伝子の配列分析.
- 推測されたタンパク質ドメインのバイオ情報分析.
主要な成果:
- 黒く見えるFdBk変異体は,色素に適応する能力がなく,光の質感の欠陥を示しています.
- ミュータントの補足により,遺伝子rcaEが特定されました.
- 推論されたRcaEタンパク質は,フィトクローム光受容体とヒスティジンキナーゼに類似するドメインを有しており,信号伝導における役割を示唆しています.
結論:
- rcaE遺伝子は,サイアノバクテリアの補完的な染色体の適応に不可欠である.
- RcaEは,光の質を感知し,光採集複合生物合成を調節するセンサーキナーゼとして機能する可能性が高い.
さらに関連する動画
関連する概念動画
02:00Photoreceptors and Plant Responses to Light
Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
02:45Biological Clocks and Seasonal Responses
The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
01:29The Photochemical Reaction Center
Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
01:11Channel Rhodopsins
Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
01:25Cell Signaling in Plants
Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
01:22Photoreceptors and Visual Pathways
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...