関連する実験動画

Updated: Sep 10, 2025

Medium Preparation for the Cultivation of Microorganisms under Strictly Anaerobic/Anoxic Conditions

Medium Preparation for the Cultivation of Microorganisms under Strictly Anaerobic/Anoxic Conditions

Published on: August 15, 2019

レドックス伝導は,無酸素メタノトロフィックコンソーシアムで直接の種間電子輸送を促進する

Hang Yu^1,2, Shuai Xu², Yamini Jangir³

¹College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.

Science advances

|August 22, 2025

まとめ

アナエロビックメタノトロフィックアーカイア (ANME) と硫酸縮小細菌 (SRB) は共生のために生物分子電子移転を使用する. この研究は,メタンの消費に対する酸化還元伝導を明らかにし,それらの電気化学的性質を定量化します.

科学分野:

微生物学
環境科学
生物化学

背景:

アナエロビックメタノトロフィックアーカイア (ANME) と硫酸縮小細菌 (SRB) は,海洋沈殿物のメタン循環に不可欠です.
シントロフィックANME/SRBのパートナーシップは,直接の種間電子転送 (DIET) を通じてメタンを消費することを提案しています.
ANME/SRB共生の基礎となる電気化学的メカニズムは,大部分が特徴づけられていない.

研究の目的:

生理学的条件下で海洋ANME/SRBコンソーシアムの電子輸送能力を測定する.
ANME/SRB共生におけるDIETの電気化学的性質と生物分子の基礎を解明する.
これらのコンソーシアム内のレドックス活性と電子転送距離を決定する.

主な方法:

様々なANME/SRBコンソーシアムの沈殿物のない濃縮培養を用いた.
ドライコンダクタンス,サイクルボルトメトリー,ジェネレーター・コレクター実験を測定した.
熱,酸素,パラフォーマルアルデヒドの固定が電子輸送に与える影響を評価した.

主要な成果:

ANME/SRBコンソーシアムは,電気生成バイオフィルムに匹敵する高い乾燥伝導性を示した.
導電性は熱と酸素に敏感でしたが,固定後に保存され,生物分子の起源を示しました.
サイクリック・ボルタメトリーにより,異なるANME/SRBペアリングの特定の酸化還元電位が特定された.
ジェネレーター・コレクターの測定で電子の伝達が確認され種間通信が容易になりました

結論:

海洋のANME/SRB共生は,効率的な直接の種間電子伝導に依存しています.
マルチヘム・サイトクロームcは,この電子移転の主要な媒介物として提案されています.
この研究は,メタンの消費のためのメカニズムとしてDIETをサポートするANME/SRBコンソーシアムの最初の電気化学的特徴を提供します.

さらに関連する動画

Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1

Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1

Published on: April 16, 2018

Self-standing Electrochemical Set-up to Enrich Anode-respiring Bacteria On-site

Self-standing Electrochemical Set-up to Enrich Anode-respiring Bacteria On-site

Published on: July 24, 2018

関連する概念動画

Metabolism of Chemolithotrophs

Metabolism of Chemolithotrophs

Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.

Redox Reactions

Redox Reactions

Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...

Anoxygenic Photosynthesis

Anoxygenic Photosynthesis

Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...

Electron Transport Chain Components

Electron Transport Chain Components

The electron transport chain (ETC) is a crucial metabolic pathway that facilitates energy conversion in prokaryotic and eukaryotic cells. In eukaryotes, the ETC comprises four membrane-associated protein complexes in the inner mitochondrial membrane. In prokaryotes, the ETC in the plasma membrane can vary in composition, with fewer or different complexes depending on the organism and environmental conditions. These complexes transfer electrons from electron donors, such as NADH and FADH2, to...

Microbial Nutrition

Microbial Nutrition

Organisms exhibit remarkable metabolic diversity, categorized based on how they acquire energy and carbon. These strategies enable survival in various ecological niches and are essential for maintaining energy flow and nutrient cycling within ecosystems.Energy and Carbon SourcesOrganisms are classified as phototrophs or chemotrophs based on energy acquisition. Phototrophs use light as their energy source, while chemotrophs rely on oxidizing chemical compounds. Further differentiation arises...

The Supercomplexes in the Crista Membrane

The Supercomplexes in the Crista Membrane

The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...