Recent structural discoveries of photosystems I and II acclimated to absorb far-red light

Gisriel, Christopher J.

doi:10.1016/j.bbabio.2024.149032

Cited by 11 publications

(9 citation statements)

References 39 publications

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“…A recent cryogenic electron-microscopy (cryo-EM) study of far-red light-adapted PSII from Synechococcus sp. PCC 7335 at 2.25 Å resolution also identified a Chl d molecule at the Chl D1 position, with Chl a preserved at the P D1 position even under FRL illumination ( Gisriel et al., 2022 ; MacGregor-Chatwin et al., 2022 ; Gisriel, 2024 ), akin to our findings for H. hongdechloris , which has either Chl d or Chl f at Chl D1 and probably exhibits a similar architecture ( Schmitt et al., 2024 ). According to Gisriel et al., four additional Chl f molecules are found in the core antenna contributing to FRL absorption in Synechococcus sp.…”

Section: Introductionsupporting

confidence: 82%

“…Such a change enables the organism to extend the spectrum of light absorption beyond the conventional red limit of oxygenic photosynthesis. A detailed understanding of the mechanisms behind FaRLiP will not only enhance our understanding of photosynthetic diversity and adaptability under spectrally extreme light conditions but also advance the bioengineering of other photosynthetic organisms to utilize far-red light ( Gisriel, 2024 ).…”

Section: Introductionmentioning

confidence: 99%

“…According to Gisriel et al., four additional Chl f molecules are found in the core antenna contributing to FRL absorption in Synechococcus sp. PCC 7335 after FaRLiP ( Gisriel et al., 2022 ; Gisriel, 2024 ).…”

Section: Introductionmentioning

confidence: 99%

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Adaptation processes in Halomicronema hongdechloris, an example of the light-induced optimization of the photosynthetic apparatus on hierarchical time scales

Schmitt,

Friedrich

2024

Front. Plant Sci.

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Oxygenic photosynthesis in Halomicronema hongdechloris, one of a series of cyanobacteria producing red-shifted Chl f, is adapted to varying light conditions by a range of diverse processes acting over largely different time scales. Acclimation to far-red light (FRL) above 700 nm over several days is mirrored by reversible changes in the Chl f content. In several cyanobacteria that undergo FRL photoacclimation, Chl d and Chl f are directly involved in excitation energy transfer in the antenna system, form the primary donor in photosystem I (PSI), and are also involved in electron transfer within photosystem II (PSII), most probably at the ChlD1 position, with efficient charge transfer happening with comparable kinetics to reaction centers containing Chl a. In H. hongdechloris, the formation of Chl f under FRL comes along with slow adaptive proteomic shifts like the rebuilding of the D1 complex on the time scale of days. On shorter time scales, much faster adaptation mechanisms exist involving the phycobilisomes (PBSs), which mainly contain allophycocyanin upon adaptation to FRL. Short illumination with white, blue, or red light leads to reactive oxygen species-driven mobilization of the PBSs on the time scale of seconds, in effect recoupling the PBSs with Chl f-containing PSII to re-establish efficient excitation energy transfer within minutes. In summary, H. hongdechloris reorganizes PSII to act as a molecular heat pump lifting excited states from Chl f to Chl a on the picosecond time scale in combination with a light-driven PBS reorganization acting on the time scale of seconds to minutes depending on the actual light conditions. Thus, structure–function relationships in photosynthetic energy and electron transport in H. hongdechloris including long-term adaptation processes cover 10−12 to 106 seconds, i.e., 18 orders of magnitude in time.

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Section: Introductionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

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Adaptation processes in Halomicronema hongdechloris, an example of the light-induced optimization of the photosynthetic apparatus on hierarchical time scales

Schmitt,

Friedrich

2024

Front. Plant Sci.

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“…Gan et al 2014) has been found across all 5 domains of cyanobacteria (Gan et al, 2015b) and is regulated at the transcriptional level via a 21-gene cluster (Gan et al 2015b) that also contains genes for a red phytochrome-triggered control cascade of FaRLiP (Zhao et al 2015). In contrast to cyanobacteria in the genus Acaryochloris that exhibit a constitutive expression of Chl d as their major photopigment (Myashita et al 1995), cyanobacteria with FaRLiP respond dynamically to light quality (Gan et al 2014) and can synthesize red-shifted phycobiliproteins, minor amounts of Chl d, as well as Chl f. FaRLiP involves the modification and inclusion of Chl f in both PSI and PSII reactions centers (Itos et al 2015, Nürnberg et al 2018Gisriel, 2024).…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to cyanobacteria in the genus Acaryochloris that exhibit a constitutive expression of Chl d as their major photopigment (Myashita et al 1995), cyanobacteria with FaRLiP respond dynamically to light quality (Gan et al 2014) and can synthesize red-shifted phycobiliproteins, minor amounts of Chl d , as well as Chl f . FaRLiP involves the modification and inclusion of Chl f in both PSI and PSII reactions centers (Itos et al 2015, Nürnberg et al 2018; Gisriel, 2024).…”

Section: Introductionmentioning

confidence: 99%

Near infrared radiation-driven oxygenic photosynthesis contributes substantially to primary production in biofilms harboring chlorophyllf-containing cyanobacteria

Mosshammer,

Trampe,

Frigaard

et al. 2024

Preprint

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Cyanobacteria with far-red light photoacclimation (FaRLiP) can modify their photopigmentation by synthesizing red-shifted phycobiliproteins and chlorophylls, i.e., chlorophyll (Chl)dandf. This enables use of near-infrared radiation (NIR) for oxygenic photosynthesis in habitats depleted of visible light (VIS). Cyanobacteria with FaRLiP are widespread but their quantitative importance for primary production in natural habitats remains unknown. Previously we showed that intertidal beachrock formations can harbor endolithic populations of Chlf-containing cyanobacteria capable of using NIR for oxygenic photosynthesis (Kühl et al., 2020). Here we use a combination of gas exchange measurements and luminescence lifetime-based O2imaging to quantify how endolithic cyanobacteria with far-red chlorophylls contribute to the primary production of an intertidal beachrock habitat when exposed to a natural gradient of visible and near-infrared radiation. While VIS-driven photosynthesis predominantly took place in the dense cyanobacterial surface biofilm of beachrock, NIR-driven photosynthesis was mainly confined to a subsurface layer in the beachrock containing endolithic cyanobacteria with Chlfandd. Yet such subsurface, NIR-driven photosynthesis provided a substantial O2production reaching >20% of the gross photosynthesis rates under comparable photon irradiance of visible light. This points to a hitherto overlooked role of far-red light acclimated cyanobacteria for primary production in natural habitats characterized by steep attenuation of visible light and relative enrichment in near-infrared radiation.

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Counter‐Anion‐Dependent Optical Properties of Cationic N22‐Methylated Chlorophyll‐a Derivatives

Ataka,

Kitagawa,

Tamiaki

2024

J of Physical Organic Chem

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Methyl N22‐methylpyropheophorbides‐a with chloride or hexafluorophosphate were prepared by chemically modifying chlorophyll‐a. The resulting product composed of cationic N‐methylated chlorin and chloride anion exhibited visible absorption and fluorescence emission maxima in chloroform at longer wavelengths than those with hexafluorophosphate. Both the absorption and emission spectra of the former were hypsochromically shifted by change of the solvent from chloroform to methanol to give almost the same corresponding spectra of the latter independent of solvents. The apparent counter‐anion dependency in chloroform and the specific solvent dependency in the N‐methyl‐chlorin with chloride are ascribable to the weak solvation of a hard chloride anion over soft hexafluorophosphate in chloroform and strong electrostatic interaction of the cationic chlorin with a chloride anion over hexafluorophosphate in chloroform as well as well solvation of both the anions in methanol. In addition, less emission of N‐methyl‐chlorin with chloride in chloroform would be due to partial fluorescence quenching based on the heavy atom effect of the adjacent chloride anion.

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Recent structural discoveries of photosystems I and II acclimated to absorb far-red light

Cited by 11 publications

References 39 publications

Adaptation processes in Halomicronema hongdechloris, an example of the light-induced optimization of the photosynthetic apparatus on hierarchical time scales

Adaptation processes in Halomicronema hongdechloris, an example of the light-induced optimization of the photosynthetic apparatus on hierarchical time scales

Near infrared radiation-driven oxygenic photosynthesis contributes substantially to primary production in biofilms harboring chlorophyllf-containing cyanobacteria

Counter‐Anion‐Dependent Optical Properties of Cationic N22‐Methylated Chlorophyll‐a Derivatives

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