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Sulfur Assimilation01:20

Sulfur Assimilation

180
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...
180
Cell Inclusions01:27

Cell Inclusions

454
Prokaryotic cells possess a variety of inclusions that play crucial roles in nutrient storage, metabolic processes, and environmental adaptation. These structures enable bacteria to thrive under fluctuating environmental conditions by storing essential resources and optimizing their metabolic efficiency.Carbon Storage: Poly-β-Hydroxybutyric Acid and Glycogen GranulesBacteria frequently store excess carbon in specialized granules. Poly-β-hydroxybutyric acid (PHB) granules are lipid...
454
Microbial Nutrition01:28

Microbial Nutrition

680
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...
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Anoxygenic Photosynthesis01:30

Anoxygenic Photosynthesis

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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...
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Carbon-dioxide Fixation01:28

Carbon-dioxide Fixation

291
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...
291
Metabolism of Chemolithotrophs01:15

Metabolism of Chemolithotrophs

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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.
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Updated: Nov 16, 2025

Prospecting Microbial Strains for Bioremediation and Probiotics Development for Metaorganism Research and Preservation
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硫黄の封じ込めは,栄養の制限中に多細胞性を促進する.

Beth Kelly1, Gustavo E Carrizo1, Joy Edwards-Hicks1

  • 1Max Planck Institute for Immunobiology and Epigenetics, Freiburg, Germany.

Nature
|February 25, 2021
PubMed
まとめ

Dictyostelium discoideumの栄養素の制限は反応性酸素種を誘発し,グルタチオンにシステインを隔離する. この硫黄の調節により 増殖が止まり 多細胞の発達が可能になり 酸素と硫黄が活性化します

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科学分野:

  • 細胞生物学
  • 生物化学
  • 発達生物学

背景:

  • Dictyostelium discoideumは栄養に依存する行動の変化を示し,飢餓時に単細胞から多細胞状態に切り替わります.
  • この生物は,代謝が細胞の分化と機能にどのように影響するかを理解するためのモデルとして機能します.

研究 の 目的:

  • 栄養素が限られたディクティオステリウム・ディスコイデウム (Dictyostelium discoideum) の活性酸素種 (ROS) の役割を調査する.
  • 硫黄の代謝が栄養素の利用可能性に応じて細胞の運命を制御するメカニズムを解明する.

主な方法:

  • 栄養素の制限下で反応性酸素種生成の分析
  • グルタチオンのシステイン結合の定量化
  • タンパク質変換と鉄硫黄クラスター酵素活性における硫黄利用の評価

主要な成果:

  • 栄養素の制限はROSを誘導し,グルタチオンのシステイン結合につながります.
  • この封じ込めはミトコンドリア代謝と細胞増殖のための硫黄の利用可能性を制限する.
  • ROSによる硫黄の調節は,多細胞の発達を促進する非増殖状態を維持する.

結論:

  • 反応性酸素種は 信号分子として作用し 硫黄の調節を通して 細胞の運命を決定します
  • 酸素と硫黄は初期の真核生物の細胞運命を決定する 重要なシグナリング分子として識別される.
  • この発見は,多細胞生物における栄養素の変動に対する細胞の反応を理解するための意味を持つ.