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Geranylgeranylated-chlorophyll-protein complexes in lhl3 mutant of the green alga Chlamydomonas reinhardtii.
Plant J
November 2024
Research Institute for Interdisciplinary Science, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama, 700-8530, Japan.
Chlorophylls a and b (Chl a and b) are involved in light harvesting, photochemical reactions, and electron transfer reactions in plants and green algae. The core complexes of the photosystems (PSI and PSII) associate with Chl a, while the peripheral antenna complexes (LHCI and LHCII) bind Chls a and b. One of the final steps of Chl biosynthesis is the conversion of geranylgeranylated Chls (Chls) to phytylated Chls by geranylgeranyl reductase (GGR).
View Article and Find Full Text PDFShining new light on naupliar eyes: A novel molecular phylogeny for Pleuromamma (Family: Metridinidae) and the characterization of luciferase and opsin expression.
Mol Phylogenet Evol
December 2024
School of Life Sciences, University of Hawai'i at Mānoa, Honolulu, HI, USA.
Pleuromamma (Giesbrecht, 1898) is a cosmopolitan genus of metridinid copepods, with species that perform remarkable diel vertical migrations (DVM) and emit a bioluminescent secretion when disturbed that varies both spectrally and kinetically. Copepod bioluminescence is autogenic and uses luciferase enzymes that catalyze a luciferin, coelenterazine, to produce light. Pleuromamma possess naupliar eyes, relatively simple photosensitive structures used for many visually-guided behaviors.
View Article and Find Full Text PDFSinglet-Oxygen-Mediated Regulation of Photosynthesis-Specific Genes: A Role for Reactive Electrophiles in Signal Transduction.
Int J Mol Sci
August 2024
Department of Botany, Faculty of Biology, University of Innsbruck, 6020 Innsbruck, Austria.
During photosynthesis, reactive oxygen species (ROS) are formed, including hydrogen peroxide (HO) and singlet oxygen (O), which have putative roles in signalling, but their involvement in photosynthetic acclimation is unclear. Due to extreme reactivity and a short lifetime, O signalling occurs via its reaction products, such as oxidised poly-unsaturated fatty acids in thylakoid membranes. The resulting lipid peroxides decay to various aldehydes and reactive electrophile species (RES).
View Article and Find Full Text PDFAtDREB2G is involved in the regulation of riboflavin biosynthesis in response to low-temperature stress and abscisic acid treatment in Arabidopsis thaliana.
Plant Sci
October 2024
Department of Life Science and Biotechnology, Faculty of Life and Environmental Sciences, Shimane University, 1060 Nishikawatsu, Matsue, Shimane 690-8504, Japan; Graduate School of Natural Science and Technology, Shimane University, 1060 Nishikawatsu, Matsue, Shimane 690-8504, Japan; Institute of Agricultural and Life Sciences, Academic Assembly, Shimane University, 1060 Nishikawatsu, Matsue, Shimane 690-8504, Japan. Electronic address:
Riboflavin (RF) serves as a precursor to flavin mononucleotide and flavin adenine dinucleotide, which are crucial cofactors in various metabolic processes. Strict regulation of cellular flavin homeostasis is imperative, yet information regarding the factors governing this regulation remains largely elusive. In this study, we first examined the impact of external flavin treatment on the Arabidopsis transcriptome to identify novel regulators of cellular flavin levels.
View Article and Find Full Text PDFMutation of the Flavokinase Confers Resistance to Roseoflavin and 8-Aminoriboflavin.
ACS Infect Dis
August 2024
Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia.
The riboflavin analogues, roseoflavin and 8-aminoriboflavin, inhibit malaria parasite proliferation by targeting riboflavin utilization. To determine their mechanism of action, we generated roseoflavin-resistant parasites by in vitro evolution. Relative to wild-type, these parasites were 4-fold resistant to roseoflavin and cross-resistant to 8-aminoriboflavin.
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