中央栄養成長ネットワークにおける窒素-CPK-NLPシグナリングの発見
Kun-Hsiang Liu1,2, Yajie Niu1, Mineko Konishi3
1Department of Molecular Biology and Centre for Computational and Integrative Biology, Massachusetts General Hospital, and Department of Genetics, Harvard Medical School, Boston, Massachusetts 02114, USA.
Nature
|May 11, 2017
まとめ
植物栄養シグナル伝達には,カルシウム (Ca2+) 経路が含まれています. この研究では,カルシウムセンサタンパク質キナーゼ (CPK) とNIN-LIKE PROTEIN (NLP) の転写因子が,成長と発達に影響を与える,窒素反応の主要な調節因子として特定されています.
科学分野:
- 植物生物学
- 分子生物学
- 生物化学
背景:
- 遺伝子発現と代謝を調整することで 栄養素のシグナル伝達が 重要な役割を果たします
- 栄養素シグナル伝達,特に窒素反応の背後にある分子メカニズムは完全に理解されていません.
- カルシウム (Ca2+) イオンは,植物信号伝達経路における重要な二次伝達物質として作用する.
研究 の 目的:
- 植物における窒素によって引き起こされるカルシウム (Ca2+) 信号の分子機構を解明する.
- アラビドプシスの主要な窒素反応の調節因子を特定する.
- 窒素シグナリングに関連する包括的な規制および開発プログラムを定義する.
主な方法:
- アラビドプシスの超敏感なCa2+バイオセンサを用いたライブイメージングを用いた.
- Ca2+センサタンパク質キナーゼ (CPK) を識別するための機能的ゲノムスクリーンを実施した.
- 三重変異体 (cpk10 cpk30 cpk32) を分析するために,エンジニアリングされた変異体 (CPK10 ((M141G)) との化学スイッチ戦略を使用した.
主要な成果:
- 亜種IIIのCPKによって誘発された独特のCa2+シグナリングを発見した.
- 主要な窒素反応のマスターレギュレータとして特定されたCPK
- CPKがNINのようなタンパク質 (NLP) の転写因子をシグナル化し,様々な細胞過程のための遺伝子セットを再プログラムすることを実証した.
- CPKとNLPの変異体も同様に,窒素刺激による芽の成長と根の確立を阻害することが示された.
結論:
- 栄養結合のCa2+シグナリングは,トランスクリプトームと細胞代謝を,芽と根の調整と統合する.
- CPKとNLPは,窒素への反応として遺伝子発現と代謝経路の再プログラムに不可欠です.
- この信号ネットワークは 臓器の生体質と構造に影響を及ぼし 発達の可塑性において重要な役割を果たします
関連する概念動画
02:35Key Elements for Plant Nutrition
24.6K
Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the...
24.6K
02:12Short-distance Transport of Resources
17.9K
Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
17.9K
01:28Global Regulatory Systems
789
Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
789
01:22Inorganic Nitrogen Assimilation
680
Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
680
02:26Protein Networks
4.6K
An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
4.6K
02:26Protein Networks
2.9K
2.9K