Thiocapsa bogoroviiのHydSLヒドロゲンゼは,硫黄呼吸に関与する可能性があります
Makhmadyusuf Khasimov1, Ekaterina P Petushkova1, Ekaterina V Mayorova1
1Institute of Basic Biological Problems RAS, PNCBI RAS, Pushchino, Moscow region, 142290, Russia.
Biochimica et biophysica acta. Bioenergetics
|February 22, 2026
まとめ
研究者らは,チオカプサ・ボゴロヴィイ (Thiocapsa bogorovii) に含まれるHydSLヒドロゲンゼを含むタンパク質複合体を特定し,硫黄の呼吸におけるその役割を実証した. この発見は,無酸素条件下における isp型水素生成物の機能に関する実験的証拠を提供します.
科学分野:
- 微生物学 微生物学とは
- バイオケミストリー バイオケミストリー
- 酵素学 酵素学とは
背景:
- NiFeヒドロゲナーゼは,サブグループに分類され,サブグループ1e (isp型) が硫黄呼吸のために提案されています.
- 現在,限られた実験的証拠が,isp型ヒドロゲネサスの硫黄呼吸機能を支持している.
研究 の 目的:
- ティオカプサ・ボゴロビイのHydSLヒドロゲンゼの機能を調査する.
- 硫黄呼吸における isp型ヒドロゲナーゼの役割に関する実験的証拠を提供すること.
主な方法:
- HydSLヒドロゲンゼを含むタンパク質複合体の分離と特徴付け.
- ネイティブおよびSDS-PAGE電泳により,複雑な組成を分析する.
- 特定の潜伏条件下での遺伝子発現分析 (トランスクリプトレベル).
- H2 + S0 → H2S反応に対する酵素活性測定.
主要な成果:
- H2 + S0 → H2S反応で高い活性を持つタンパク質複合体が分離されました.
- 複合体は,HydS,Isp1,Isp2,およびHydLタンパク質で構成されています.
- 複雑なサブユニットをコードする遺伝子の発現は,水素と元素硫黄のインキュベーション下で増加した.
- 遺伝子の発現の増加は,元素硫黄の減少における細胞活動の強化と相関する.
結論:
- T. bogoroviiのHydSLを含むタンパク質複合体は,硫黄の呼吸に関与している可能性が高い.
- この機能は,酸素や発酵可能な基板のない暗い無酸素状態で発生します.
- この発見は,この複合体を硫化水素酵素酵素として指定することを支持する.
関連する概念動画
Sulfur Assimilation
421
Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...
421
Carbon-dioxide Fixation
765
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...
765
Anoxygenic Photosynthesis
1.5K
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...
1.5K
Anoxygenic Phototrophic Bacteria
973
Anoxygenic phototrophic bacteria are a diverse group of microorganisms that perform photosynthesis without producing oxygen. They primarily include purple sulfur bacteria, purple nonsulfur bacteria, green sulfur bacteria, and green nonsulfur bacteria. These bacteria are classified into the Gammaproteobacteria, Alphaproteobacteria, Betaproteobacteria, Chlorobi, and Chloroflexi lineages, each with distinct physiological and ecological adaptations.Purple sulfur bacteria belong to the...
973
Preparation and Reactions of Thiols
7.7K
Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
7.7K
The Sulfur Cycle
52.4K
Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the atmosphere as sulfur dioxide (SO2), sulfur is released by decaying organisms, weathered rocks, geothermal vents, volcanos, and burning fossil fuels. It is deposited into the ecosystem, cycled through the biotic community, and either released back into the atmosphere as gas or deposited in marine sediment for long-term storage and eventual...
52.4K

![Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F55858.jpg&w=3840&q=50)
