Journal of Photochemistry and Photobiology A Chemistry, Journal Year: 2024, Volume and Issue: 462, P. 116257 - 116257
Published: Dec. 31, 2024
Language: Английский
Journal of Integrative Plant Biology, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 24, 2025
ABSTRACT Plants, algae and photosynthetic bacteria convert light into chemical energy by means of photosynthesis, thus providing food for most organisms on Earth. Photosynthetic pigments, including chlorophylls (Chls) carotenoids, are essential components that absorb the necessary to drive electron transport in photosynthesis. The biosynthesis Chl shares several steps common with other tetrapyrroles, siroheme, heme phycobilins. Given many tetrapyrrole precursors possess photo‐oxidative properties deleterious macromolecules can lead cell death, (TBS) requires stringent regulation under various developmental environmental conditions. Thanks decades research model plants algae, we now have a deeper understanding regulatory mechanisms underlie synthesis, (i) factors control activity stability TBS enzymes, (ii) transcriptional post‐translational pathway, (iii) complex roles tetrapyrrole‐mediated retrograde signaling from chloroplasts cytoplasm nucleus. Based these new findings, Chls their derivatives will find broad applications synthetic biology agriculture future.
Language: Английский
Citations
2
The Plant Cell, Journal Year: 2024, Volume and Issue: 36(10), P. 4036 - 4064
Published: April 23, 2024
Cyanobacteria, red algae, and cryptophytes produce 2 classes of proteins for light harvesting: water-soluble phycobiliproteins (PBP) membrane-intrinsic that bind chlorophylls (Chls) carotenoids. In cyanobacteria, glaucophytes, phycobilisomes (PBS) are complexes brightly colored PBP linker (assembly) proteins. To date, 6 structural PBS have been described: hemiellipsoidal, block-shaped, hemidiscoidal, bundle-shaped, paddle-shaped, far-red-light bicylindrical. Two additional antenna containing single types also described. Since 2017, structures reported examples all these except bundle-shaped by cryogenic electron microscopy. range in size from about 4.6 to 18 mDa can include ∼900 polypeptides >2000 chromophores. Cyanobacteria additionally membrane-associated the PsbC/CP43 superfamily Chl a/b/d-binding proteins, including iron-stress protein IsiA other paralogous Chl-binding (CBP) form with Photosystem I (PSI) and/or II (PSII). Red cryptophyte algae CBP associated PSI but which belong a/b-binding unrelated cyanobacteria. This review describes recent progress structure determination cryptophytan algae.
Language: Английский
Citations
11
Photosynthesis Research, Journal Year: 2025, Volume and Issue: 163(1)
Published: Jan. 17, 2025
Abstract Pheophytin- a derivatives possessing plastoquinone and phylloquinone analogs in the peripheral 3-substituent were prepared by Friedel–Crafts reactions of 3-hydroxymethyl-chlorin as one chlorophyll- with benzo- naphthohydroquinones, respectively, successive oxidation 1,4-dihydroxy-aryl groups resulting dehydration products. The 3-quinonylmethyl-chlorins exhibited ultraviolet–visible absorption circular dichroism spectra acetonitrile, which composed those starting corresponding methylated naphthoquinones. No intramolecular interaction between chlorin quinone π-systems was observed solution owing to methylene spacer. first reduction potentials moieties synthetic conjugates determined cyclic voltammetry shifted positively from reference quinones. former quinonyl reduced more readily approximately 0.1 V than latter quinones, ascribable stabilization anion radical nearby macrocyclic π-chromophore. This observation implied that quinones regulated close pheophytin- derivative through-space interaction. Considering charge shift reaction centers photosystems II I, these determinant factor rapid electron transfer process would be dependent on photosynthetic oxygenic phototrophs well neighboring peptides.
Language: Английский
Citations
0
bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2024, Volume and Issue: unknown
Published: June 3, 2024
Abstract Some cyanobacteria can do photosynthesis using not only visible but also far-red light that is unused by most other oxygenic photoautotrophs because of its lower energy content. These species have a modified photosynthetic apparatus containing red-shifted pigments. The incorporation pigments decreases the photochemical efficiency photosystem I and, especially, II, and it might affect distribution excitation between two photosystems with possible consequences on activity entire electron transport chain. To investigate in vivo effects these pigment changes, we present here adaptation spectroscopic method, based physical phenomenon called ElectroChromic Shift (ECS), to absorbing Acaryochloris marina Chroococcidiopsis thermalis PCC7203. ECS measures electric field component trans-thylakoid proton motive force generated transfer. We show be used stoichiometry II their absorption cross-section, as well overall conversion into transport. Our results indicate both use similar efficiency, despite significant differences characteristics. thus represents new non-invasive tool study performance naturally occurring photosynthesis.
Language: Английский
Citations
0
Biochimica et Biophysica Acta (BBA) - Bioenergetics, Journal Year: 2024, Volume and Issue: 1865(4), P. 149502 - 149502
Published: Aug. 9, 2024
Language: Английский
Citations
0
Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy, Journal Year: 2024, Volume and Issue: 330, P. 125681 - 125681
Published: Dec. 30, 2024
Language: Английский
Citations
0
Journal of Photochemistry and Photobiology A Chemistry, Journal Year: 2024, Volume and Issue: 462, P. 116257 - 116257
Published: Dec. 31, 2024
Language: Английский
Citations
0