photoautotrophic

Edge evidence

• photoautotrophic uses energy source light METPO:2000010

  Photoautotrophy uses light as the energy source.

  • DOI:10.3390/life10050071 capture solar energy Supports light capture by cyanobacteria under photoautotrophic metabolism.
• photosystem II oxidizes water METPO:2000016

  Oxygenic photosynthesis extracts electrons from water through PSII.

  • DOI:10.3390/life10050071 uses it to split H2O Supports water splitting by PSII in cyanobacteria.
• water oxidized to molecular oxygen METPO:2007405

  Water oxidation releases molecular oxygen.

  • DOI:10.3390/life10050071 split H2O molecules into O2 Supports oxygen as the product of water splitting.
• photosystem II feeds electrons into photosynthetic electron transport METPO:2007402

  PSII feeds electrons into the photosynthetic electron transport chain.

  • DOI:10.3390/life10050071 passes its reducing equivalents to an electron transfer chain Supports electron flow from PSII/plastoquinol into photosynthetic electron transport.
• photosynthetic electron transport produces ATP and NADPH METPO:2000202

  Photosynthetic electron transport generates ATP and NADPH.

  • DOI:10.3390/life10050071 generate chemical energy (ATP) and reducing power (NADPH) Supports ATP and NADPH generation by photosynthetic electron transport.
• carbon dioxide fixed by Calvin-Benson cycle METPO:2007404

  CO2 is assimilated through the Calvin-Benson cycle in many photoautotrophs.

  • DOI:10.1128/AEM.02473-10 Calvin-Benson reductive pentose phosphate cycle Supports Calvin-Benson cycle as an autotrophic CO2-fixation route.
• RuBisCO catalyzes Calvin-Benson cycle biolink:catalyzes

  RuBisCO is a key carboxylating enzyme for Calvin-Benson CO2 fixation.

  • DOI:10.3390/life10050071 Calvin cycle enzymes, RuBisCO Supports RuBisCO as a Calvin-cycle enzyme tied to CO2 fixation rate.
• Calvin-Benson cycle produces biomass METPO:2000202

  Fixed carbon supports biosynthesis and biomass production.

  • DOI:10.3390/life10050071 fix ... CO2 into ... biomass Supports CO2 fixation into biomass by cyanobacterial photoautotrophy.
• photosynthetic electron transport enables Calvin-Benson cycle RO:0002327

  Light-driven photosynthetic electron transport supplies the energy/reductant that drives CBB-cycle CO2 fixation.

  • DOI:10.3389/fpls.2024.1417680 Phototrophs use light energy to drive a photosynthetic electron transport chain, and CO2 fixation occurs via the Calvin-Benson-Bassham cycle.
• carbon-concentrating mechanism lowers RuBisCO oxygenase activity

  The CCM enriches intracellular inorganic carbon, suppressing the wasteful RuBisCO oxygenase reaction.

  • DOI:10.3389/fpls.2024.1417680 The CCM lowers RuBisCO's oxygenase reaction to below ~1% by enriching intracellular inorganic carbon.
• bicarbonate diffuses into carboxysome

  Cytoplasmic bicarbonate enters the carboxysome where it is converted to CO2 for fixation.

  • DOI:10.1111/ppl.14140 Cytoplasmic HCO3- diffuses into the carboxysome.
• carboxysomal carbonic anhydrase converts bicarbonate

  Carboxysomal carbonic anhydrase dehydrates bicarbonate to CO2 to feed RuBisCO.

  • DOI:10.1111/ppl.14140 Bicarbonate is converted back to CO2 by carbonic anhydrase inside carboxysomes (CA produces CO2).