A Red-Shifted Chlorophyll

Chen, Min; Schliep, Martin; Willows, Robert D.; Cai, Zheng Li; Neilan, Brett A.; Scheer, Hugo

doi:10.1126/science.1191127

Cited by 468 publications

(361 citation statements)

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“…Furthermore, Chl f was recently discovered in filamentous (Chen et al, 2010;Airs et al, 2014;Gan et al, 2014) and unicellular cyanobacteria (Miyashita et al, 2014), enabling light harvesting even further into the NIR region up to B740 nm, often aided by employing additional far-red light-absorbing pigments such as Chl d and phycobiliproteins (Gan et al, 2014). Whereas the biochemical structure (Willows et al, 2013) and biophysical properties Tomo et al, 2014) of Chl f have been studied in detail, the actual importance of this new chlorophyll for photosynthesis is hardly explored (Li et al, 2014).…”

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confidence: 99%

“…In addition, weak spectral signatures of carotenoids and phycobilins, with absorption occurring at B495 and 665 nm, were evident in the hyperspectral data. Cyanobacteria, including those producing Chl d/f, are known to actively remodel their pigment content in response to the available light spectrum (Stomp et al, 2007;Chen and Scheer, 2013;Gan et al, 2014) and Chl d/f has almost exclusively been found in cyanobacteria grown under far-red light and not under visible light (Kü hl et al, 2005;Chen et al, 2010;Airs et al, 2014;Gan et al, 2014;Li et al, 2014;Miyashita et al, 2014). Recent work describes this acclimation response as 'Far-Red Light photoacclimation' (FaRLiP), which, in strain JSC-1, comprises a global change in gene expression and structural remodeling of the PSII/PSI core proteins and phycobilisome constituents (Gan et al, 2014).…”

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confidence: 99%

“…The textbook concept that oxygenic phototrophs primarily use radiation in the visible range (400-700 nm) has been challenged by several findings of unique cyanobacteria and chlorophylls (Chl) over the past two decades (Miyashita et al, 1996;Chen et al, 2010;Croce and van Amerongen, 2014) Unicellular cyanobacteria in the genus Acaryochloris primarily employ Chl d for oxygenic photosynthesis at 700-720 nm (Miyashita et al, 1996) and thrive in shaded habitats with low levels of visible light but replete of near-infrared radiation (NIR, 4700 nm, Kü hl et al, 2005;Behrendt et al, 2011Behrendt et al, , 2012. Furthermore, Chl f was recently discovered in filamentous (Chen et al, 2010;Airs et al, 2014;Gan et al, 2014) and unicellular cyanobacteria (Miyashita et al, 2014), enabling light harvesting even further into the NIR region up to B740 nm, often aided by employing additional far-red light-absorbing pigments such as Chl d and phycobiliproteins (Gan et al, 2014).…”

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Chlorophyll f-driven photosynthesis in a cavernous cyanobacterium

et al. 2015

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Chlorophyll (Chl) f is the most recently discovered chlorophyll and has only been found in cyanobacteria from wet environments. Although its structure and biophysical properties are resolved, the importance of Chl f as an accessory pigment in photosynthesis remains unresolved. We found Chl f in a cyanobacterium enriched from a cavernous environment and report the first example of Chl f-supported oxygenic photosynthesis in cyanobacteria from such habitats. Pigment extraction, hyperspectral microscopy and transmission electron microscopy demonstrated the presence of Chl a and f in unicellular cyanobacteria found in enrichment cultures. Amplicon sequencing indicated that all oxygenic phototrophs were related to KC1, a Chl f-containing cyanobacterium previously isolated from an aquatic environment. Microsensor measurements on aggregates demonstrated oxygenic photosynthesis at 742 nm and less efficient photosynthesis under 768-and 777-nm light probably because of diminished overlap with the absorption spectrum of Chl f and other far-red absorbing pigments. Our findings suggest the importance of Chl f-containing cyanobacteria in terrestrial habitats.

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Chlorophyll f-driven photosynthesis in a cavernous cyanobacterium

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“…Rarely do extant oxygenic organisms possess chlorophylls with a longer wavelength range to ca. 720 nm, e.g., Chl d (Allakhverdiev et al 2010) and even Chl f (Chen et al 2010). Are these rare chlorophylls to be regarded as evolutionary remnants, as evolutionary transitions, or as interesting variants that do not represent direct clues to or from a major evolutionary path?…”

Section: Two Photosystems and The Water Splitting Complexmentioning

confidence: 99%

Oxygenic photosynthesis and the distribution of chloroplasts

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2010

Photosynth Res

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The integrated functioning of two photosystems (I and II) whether in cyanobacteria or in chloroplasts is the outstanding sign of a common ancestral origin. Many variations on the basic theme are currently evident in oxygenic photosynthetic organisms whether they are prokaryotes, unicellular, or multicellular. By conservative estimates, oxygenic photosynthesis has been around for at least ca. 2.2-2.7 billions years, consistent with cyanobacteria-type microfossils, biomarkers, and an atmospheric rise in oxygen to less than 1.0% of the present concentration. The presumptions of chloroplast formation by the cyanobacterial uptake into a eukaryote prior to 1.6 BYa ago are confounded by assumptions of host type(s) and potential tolerance of oxygen toxicity. The attempted dating and interrelationships of particular chloroplasts in various plant or animal lineages has relied heavily on phylogenomic analysis and evaluations that have been difficult to confirm separately. Many variations occur in algal groups, involving the type and number of accessory pigments, and the number(s) of membranes (2-4) enclosing a chloroplast, which can both help and complicate inferences made about early or late origins of chloroplasts. Integration of updated phylogenomics with physiological and cytological observations remains a special challenge, but could lead to more accurate assumptions of initial and extant endosymbiotic event(s) leading toward stable chloroplast associations.

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“…Such extension is possible using Chl d or f (Allakhverdiev et al, 2010, ;Chen et al, 2010;Chen and Blankenship, 2011;Chen and Scheer, 2013;Loughlin et al, 2013;Tomo et al, 2011Tomo et al, , 2014. However, the creation of artificial solar cells based on these chlorophylls is still in its early stages of development.…”

Section: Extension Of the Spectral Range Of The Light Absorption By Pmentioning

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Photoelectrochemical cells based on photosynthetic systems: a review

et al. 2015

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HIGHLIGHTSPhotosynthesis is a process which converts light energy into energy contained in the chemical bonds of organic compounds by photosynthetic pigments such as chlorophyll (Chl a, b, c, d, f) or bacteriochlorophyll. It occurs in phototrophic organisms, which include higher plants and many types of photosynthetic bacteria, including cyanobacteria. In the case of the oxygenic photosynthesis, water is a donor of both electrons and protons, and solar radiation serves as inexhaustible source of energy. Efficiency of energy conversion in the primary processes of photosynthesis is close to 100%. Therefore, for many years photosynthesis has attracted the attention of researchers and designers looking for alternative energy systems as one of the most efficient and eco-friendly pathways of energy conversion. The latest advances in the design of optimal solar cells include the creation of converters based on thylakoid membranes, photosystems, and whole cells of cyanobacteria immobilized on nanostructured electrode (gold nanoparticles, carbon nanotubes, nanoparticles of ZnO and TiO2). The mode of solar energy conversion in photosynthesis has a great potential as a source of renewable energy while it is sustainable and environmentally safety as well. Application of pigments such as Chl f and Chl d (unlike Chl a and Chl b), by absorbing the far-red and near infrared region of the spectrum (in the range 700-750 nm), will allow to increase the efficiency of such light transforming systems. This review article presents the last achievements in the field of energy photoconverters based on photosynthetic systems.

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A Red-Shifted Chlorophyll

Cited by 468 publications

References 12 publications

Chlorophyll f-driven photosynthesis in a cavernous cyanobacterium

Chlorophyll f-driven photosynthesis in a cavernous cyanobacterium

Oxygenic photosynthesis and the distribution of chloroplasts

Photoelectrochemical cells based on photosynthetic systems: a review

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