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Article
Crosstalk between photosynthesis and respiration in microbes
Phototrophic organisms harbor two main bioenergetic hubs, photosynthesis and respiration, and these processes dynamically exchange and share metabolites to balance the energy of the cell. In microalgae and cya...
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Article
Extra O2 evolution reveals an O2-independent alternative electron sink in photosynthesis of marine diatoms
Following the principle of oxygenic photosynthesis, electron transport in the thylakoid membranes (i.e., light reaction) generates ATP and NADPH from light energy, which is subsequently utilized for CO2 fixation ...
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Article
Different Responses of Photosynthesis to Nitrogen Starvation Between Highly Oil-Accumulative Diatoms, Fistulifera solaris and Mayamaea sp. JPCC CTDA0820
Highly oil-accumulative diatoms are expected to be a promising biomass for the production of biofuel. To harvest the diatom oils at high yields, it is critical to elucidate the relationship of oil accumulation...
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Article
NADPH production in dark stages is critical for cyanobacterial photocurrent generation: a study using mutants deficient in oxidative pentose phosphate pathway
Live cyanobacteria and algae integrated onto an extracellular electrode can generate a light-induced current (i.e., a photocurrent). Although the photocurrent is expected to be correlated with the redox enviro...
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Article
Dissection of respiratory and cyclic electron transport in Synechocystis sp. PCC 6803
Cyclic electron transport (CET) is an attractive hypothesis for regulating photosynthetic electron transport and producing the additional ATP in oxygenic phototrophs. The concept of CET has been established in...
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Article
Open AccessOrder-of-magnitude enhancement in photocurrent generation of Synechocystis sp. PCC 6803 by outer membrane deprivation
Biophotovoltaics (BPV) generates electricity from reducing equivalent(s) produced by photosynthetic organisms by exploiting a phenomenon called extracellular electron transfer (EET), where reducing equivalent(...
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Article
Coral symbionts evolved a functional polycistronic flavodiiron gene
Photosynthesis in cyanobacteria, green algae, and basal land plants is protected against excess reducing pressure on the photosynthetic chain by flavodiiron proteins (FLV) that dissipate photosynthetic electro...
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Article
Open AccessQuantification of NAD(P)H in cyanobacterial cells by a phenol extraction method
In photosynthetic organisms, it is recognized that the intracellular redox ratio of NADPH is regulated within an appropriate range for the cooperative function of a wide variety of physiological processes. How...
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Article
Open AccessTime-of-day-dependent responses of cyanobacterial cellular viability against oxidative stress
As an adaptation to periodic fluctuations of environmental light, photosynthetic organisms have evolved a circadian clock. Control by the circadian clock of many cellular physiological functions, including ant...
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Article
Photoprotection mechanisms under different CO2 regimes during photosynthesis in a green alga Chlorella variabilis
Oxygenic photosynthesis converts light energy into chemical energy via electron transport and assimilates CO2 in the Calvin–Benson cycle with the chemical energy. Thus, high light and low CO2 conditions induce th...
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Article
Near-infrared in vivo measurements of photosystem I and its lumenal electron donors with a recently developed spectrophotometer
In photosynthesis research, non-invasive in vivo spectroscopic analyses have been used as a practical tool for studying photosynthetic electron transport. Klas-NIR spectrophotometer has been recently developed...
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Article
Comparative analysis of strategies to prepare electron sinks in aquatic photoautotrophs
While subject to illumination, photosystem I (PSI) has the potential to produce reactive oxygen species (ROS) that can cause photo-oxidative damage in oxygenic photoautotrophs. The reaction center chlorophyll ...
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Article
Respiratory terminal oxidases alleviate photo-oxidative damage in photosystem I during repetitive short-pulse illumination in Synechocystis sp. PCC 6803
Oxygenic phototrophs are vulnerable to damage by reactive oxygen species (ROS) that are produced in photosystem I (PSI) by excess photon energy over the demand of photosynthetic CO2 assimilation. In plant leaves,...
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Article
Open AccessDiverse strategies of O2 usage for preventing photo-oxidative damage under CO2 limitation during algal photosynthesis
Photosynthesis produces chemical energy from photon energy in the photosynthetic electron transport and assimilates CO2 using the chemical energy. Thus, CO2 limitation causes an accumulation of excess energy, res...
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Article
Diversity in photosynthetic electron transport under [CO2]-limitation: the cyanobacterium Synechococcus sp. PCC 7002 and green alga Chlamydomonas reinhardtii drive an O2-dependent alternative electron flow and non-photochemical quenching of chlorophyll fluorescence during CO2-limited photosynthesis
Some cyanobacteria, but not all, experience an induction of alternative electron flow (AEF) during CO2-limited photosynthesis. For example, Synechocystis sp. PCC 6803 (S. 6803) exhibits AEF, but Synechococcus elo...
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Article
Open AccessOverexpression of flv3 improves photosynthesis in the cyanobacterium Synechocystis sp. PCC6803 by enhancement of alternative electron flow
To ensure reliable sources of energy and raw materials, the utilization of sustainable biomass has considerable advantages over petroleum-based energy sources. Photosynthetic algae have attracted attention as ...
