植物におけるベンゾイル-コアからサリチル酸の3段階の生物合成

Yanan Liu¹, Lu Xu², Mingsong Wu¹

¹Key Laboratory of Bio-resource and Eco-environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China.

Nature

|July 23, 2025

まとめ

科学者は,種子植物におけるサリチル酸 (SA) 生物合成の保存経路を発見した. この経路は3つの鍵となる酵素を含んでおり植物防御に不可欠であり異なる植物ファミリーで保たれています

科学分野:

植物生物学
生物化学
分子生物学

背景:

サリシル酸 (SA) は,医学で歴史的に使用されている重要な植物防衛ホルモンです.
これまでのSA生物合成の理解は,モデル植物アラビドプシスに限られていた.
ブラシカセア以外の植物におけるSA合成の経路は,ほとんど不明のままでした.

研究の目的:

種子植物におけるサリチル酸生物合成の保存経路を特定し,特徴づけること.
ブラシカセア以外でSAの生産に関わる主要な酵素とステップを明らかにする.

主な方法:

ニコチア・ベンタミアナをモデル生物として利用した.
ベンゾイル-CoA:ベンジルアルコールのベンジルトランスファーゼ (BEBT),ベンジルベンゾ酸酸化酶 (BBO),およびベンジルサリチ酸水酸化酶 (BSH) の3つの主要な酵素を特定し,特徴づけました.
SA欠乏性変異体における補完性アッセイと米 (Oryza sativa) のノックアウト分析により遺伝子機能が確認された.

主要な成果:

ベンジルベンゾ酸の形成,ベンジルサリシラートへの水酸化,およびSAの生成のための3段階の経路が特定されました.
BEBT,BBO,およびBSHをコードする遺伝子が,幅広い二葉植物および一葉植物種に保存されていることが実証されました.
これらの遺伝子が米のSAバイオシンセシスにおける重要な役割をノックアウト研究で確認した.

結論:

特定されたSA生物合成経路は種子植物に保存されます.
この保存された経路は植物の防御メカニズムに不可欠です
この発見は,様々な植物ファミリーのSA合成に関する包括的な理解を提供します.

さらに関連する動画

08:56

Transient Expression in Nicotiana Benthamiana Leaves for Triterpene Production at a Preparative Scale

Published on: August 16, 2018

17.5K

09:50

Biosynthesis of a Flavonol from a Flavanone by Establishing a One-pot Bienzymatic Cascade

Published on: August 14, 2019

9.4K

関連する概念動画

01:46

The Calvin Benson Cycle

4.7K

Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...

4.7K

01:27

C4 Pathway and CAM

46.2K

Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
C4 Pathway
The C4 pathway is used by plants such as...

46.2K

01:40

The Calvin Cycle

76.6K

OverviewOxygenic photosynthesis plays a central role in the global carbon and oxygen cycles. The carbohydrates produced support nearly all food webs, while the oxygen by‑product enables aerobic life.Light‑dependent and light‑independent reactionsPhotosynthesis occurs in two main stages, each in a different part of the chloroplast: light‑dependent reactions and light‑independent reactions, also called the Calvin‑Benson cycle or simply the Calvin...

76.6K

01:24

Biosynthesis in Bacteria

107

Biosynthesis in bacteria is a fundamental anabolic process that generates essential macromolecules, including proteins, nucleic acids, lipids, and polysaccharides. These macromolecules are critical for cellular growth, replication, and function. The process is tightly regulated and energetically linked to catabolic pathways to ensure optimal resource utilization.Biosynthetic pathways begin with precursor metabolites such as pyruvate, acetyl-CoA, and glucose-6-phosphate derived from glycolysis,...

107

01:29

Amino Acid Biosynthetic Pathways

141

Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which...

141

01:28

Carbon-dioxide Fixation

Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...

関連する実験動画