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Cyanobacteria are a diverse group of oxygenic, phototrophic bacteria that played a pivotal role in converting Earth’s atmosphere from anoxic to oxygen-rich billions of years ago. They exhibit remarkable morphological diversity, ranging from unicellular forms to filamentous types, with cell sizes varying between 0.5 μm and 100 μm. Cyanobacteria are classified into five groups: Chroococcales (unicellular, dividing by binary fission), Pleurocapsales (unicellular, dividing by...
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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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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...
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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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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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Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
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Assembly and Quantification of Co-Cultures Combining Heterotrophic Yeast with Phototrophic Sugar-Secreting Cyanobacteria
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Assembly and Quantification of Co-Cultures Combining Heterotrophic Yeast with Phototrophic Sugar-Secreting Cyanobacteria

Published on: December 27, 2024

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Heterotrophy among Cyanobacteria.

Ronald Stebegg1, Georg Schmetterer1, Annette Rompel1

  • 1Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, 1090 Wien, Austria.

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|September 25, 2023
PubMed
Summary
This summary is machine-generated.

Cyanobacteria exhibit surprising flexibility beyond photosynthesis, with many strains capable of heterotrophic growth. This review highlights their underestimated adaptability and diverse nutritional capabilities.

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Area of Science:

  • Microbiology and Photosynthesis Research
  • Cyanobacterial Physiology and Ecology

Background:

  • Cyanobacteria are key models for studying oxygenic photosynthesis.
  • Historically, their metabolic versatility, particularly heterotrophy, has been underestimated.
  • Many cyanobacterial strains can utilize organic compounds for growth.

Purpose of the Study:

  • To review known cyanobacterial strains capable of heterotrophic growth.
  • To catalog substrates and conditions supporting heterotrophy in cyanobacteria.
  • To emphasize the underestimated metabolic flexibility of cyanobacteria.

Main Methods:

  • Literature review and data compilation.
  • Phylogenetic structuring of identified heterotrophic strains.
  • Detailed analysis of growth conditions for heterotrophy.

Main Results:

  • A comprehensive list of cyanobacterial strains capable of heterotrophy, organized phylogenetically.
  • Identification of various organic substrates utilized by these strains.
  • Detailed conditions promoting heterotrophic growth are presented.

Conclusions:

  • Cyanobacteria possess significant metabolic flexibility beyond photoautotrophy.
  • Understanding heterotrophy is crucial for novel cultivation strategies.
  • Further research is encouraged to discover new heterotrophic strains.