Elucidating mechanism cellular uptake
In most bacteria and in eukaryotes, Th MP is hydrolyzed to thiamine, which may then be pyrophosphorylated to Th DP by thiamine diphosphokinase (thiamine ATP → Th DP AMP, EC 220.127.116.11).The biosynthetic pathways are regulated by riboswitches.It is believed that the development of the arbuscular mycorrhizal symbiosis played a crucial role in the initial colonisation of land by plants and in the evolution of the vascular plants.Both paleobiological and molecular evidence indicate that AM is an ancient symbiosis that originated at least 460 million years ago.Nakase, I.; Ueno, N.; Katayama, M.; Noguchi, K.; Takatani-Nakase, T.; Kobayashi, N.; Yoshida, T.; Fujii, I.; Futaki, S., Receptor Clustering and Activation by Multivalent Interaction through Recognition Peptides Presented on Exosomes Chem. Motoyama, K.; Nishiyama, R.; Maeda, Y.; Higashi, T.; Kawaguchi, Y.; Futaki, S.; Ishitsuka, Y.; Kondo, Y.; Irie, T.; Era, T.; Arima H., Cholesterol-lowering Effect of Octaarginine-appended β-Cyclodextrin in Npc1-trap-CHO Cells Biol. Stress-responsive dihydroxy B-ring-substituted flavonoids have great potential to inhibit the generation of reactive oxygen species (ROS) and reduce the levels of ROS once they are formed, i.e., to perform antioxidant functions.These flavonoids are located within or in the proximity of centers of ROS generation in severely stressed plants.
Dihydroxy B-ring substituted flavonoids are present in the nucleus of mesophyll cells and may inhibit ROS-generation making complexes with Fe and Cu ions.
Vacuolar dihydroxy B-ring flavonoids have been reported to serve as co-substrates for vacuolar peroxidases to reduce H escape from the chloroplast, following the depletion of ascorbate peroxidase activity.
Antioxidant flavonoids may effectively control key steps of cell growth and differentiation, thus acting regulating the development of the whole plant and individual organs.► Stress-responsive dihydroxy B-ring-substituted flavonoids are effective antioxidants.
Thiamine is soluble in water, methanol, and glycerol and practically insoluble in less polar organic solvents.
It is stable at acidic p H, but is unstable in alkaline solutions.