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関連する概念動画

Cell Signaling in Plants01:25

Cell Signaling in Plants

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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...
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Biological Clocks and Seasonal Responses02:45

Biological Clocks and Seasonal Responses

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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.
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Photoreceptors and Plant Responses to Light02:00

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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.
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Channel Rhodopsins01:11

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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.
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Plant hormones—or phytohormones—are chemical molecules that modulate one or more physiological processes of a plant. In animals, hormones are often produced in specific glands and circulated via the circulatory system. However, plants lack hormone-producing glands.
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Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency can...
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Updated: Sep 28, 2025

Investigating Tissue- and Organ-specific Phytochrome Responses using FACS-assisted Cell-type Specific Expression Profiling in Arabidopsis thaliana
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植物フィトクロームBは,ユニークなシグナル伝達能力を有する非対称なダイマーである.

Hua Li1, E Sethe Burgie2, Zira T K Gannam2

  • 1Department of Structural Biology, Van Andel Institute, Grand Rapids, MI, USA.

Nature
|March 31, 2022
PubMed
まとめ
この要約は機械生成です。

アラビドプシス・フィトクロームB (PhyB) の最初の3D構造は,原生生物の親類とは異なるユニークな二次元組織を明らかにする. この構造は,光信号が植物で認識され,伝達され,PhyBの安定性とシグナル伝達に影響を及ぼすことを説明します.

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科学分野:

  • 植物生物学
  • 分子光受容体
  • 構造生物学

背景:

  • 植物による光感知は,ビリンを含む光感受体であるフィトクローム (Phy) に依存する.
  • 物理信号の理解は3D構造データの欠如によって制限されています.

研究 の 目的:

  • アラビドプシスPhyBの不活性 (Pr) 状態の3D構造を決定する.
  • PhyBの二次組織と信号伝送への影響の構造的基礎を解明する.

主な方法:

  • アラビドプシスPhyBの構造を決定するために,冷凍電子顕微鏡 (cryo-EM) が使用されました.
  • 領域の相互作用とその光受容体機能への影響を理解するために生化学的分析が用いられました.

主要な成果:

  • PhyBの新しい二重構造が明らかにされ,プロカリオット植物性染色体と大きく異なる.
  • 構造は,C端領域の頭から頭への関連と,N端の光感受領域の頭から尾への関連を示し,平行図を形成する.
  • 活性Pfr状態から不活性Pr状態への逆転を加速し,Pfrの安定性を低下させる内部ドメインのリンクが特定されました.

結論:

  • PhyBのユニークな二次元構造は,植物による光信号の知覚と伝導に関する洞察を提供します.
  • 構造的非対称性は,各プロトメアの異なるシグナリングポテンシャルを示唆する.
  • ダイナミックな構造は,光知覚を媒介するシグナリングパートナーとの形状依存の相互作用を容易にする.