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Nitric oxide sensing in plants is mediated by the N-end rule of proteolysis [61] [62] and controls abiotic stress responses such as flooding-induced hypoxia, [63] salt and drought stress. [64] [65] [66] Nitric oxide interactions have been found within signaling pathways of plant hormones such as auxin, [67] ethylene, [63] [68] [69] Abscisic ...
Once nitric oxide is converted to nitrates and nitrites by oxygen and water, cell signaling is deactivated. [31] The endothelium (inner lining) of blood vessels uses nitric oxide to signal the surrounding smooth muscle to relax, resulting in vasodilation and increasing blood flow. [30] Sildenafil (Viagra) is a drug that uses the nitric oxide ...
Hemoglobin in normal red blood cells is protected by a reduction system to keep this from happening. Nitric oxide is capable of converting a small fraction of hemoglobin to methemoglobin in red blood cells. The latter reaction is a remnant activity of the more ancient nitric oxide dioxygenase function of globins.
Nitric oxide synthases (EC 1.14.13.39) (NOSs) are a family of enzymes catalyzing the production of nitric oxide (NO) from L-arginine. NO is an important cellular signaling molecule. It helps modulate vascular tone , insulin secretion, airway tone, and peristalsis , and is involved in angiogenesis and neural development.
Peroxynitrite and nitric oxide are reactive oxygen-containing species as well. Hydroxyl radical (HO·) is generated by Fenton reaction of hydrogen peroxide with ferrous compounds and related reducing agents: Fe(II) + H 2 O 2 → Fe(III)OH + HO· In its fleeting existence, the hydroxyl radical reacts rapidly irreversibly with all organic compounds.
It is a known bioproduct in almost all types of organisms, ranging from bacteria to plants, fungi, and animal cells. [29] [30] NO is biosynthesized endogenously from L-arginine by various nitric oxide synthase (NOS) enzymes. Reduction of inorganic nitrate may also serve to make NO.
Cherries are good sources of antioxidants, and sweet cherries are higher in anthocyanins than tart cherries. Cherries are good sources of the antioxidant vitamin C. They contain tryptophan, which ...
This is demonstrated by the fact that, in many cell types, nitric oxide synthesis can be supported to some extent by citrulline, and not just by arginine. This recycling is not quantitative, however, because citrulline accumulates in nitric oxide producing cells along with nitrate and nitrite, the stable end-products of nitric oxide breakdown. [24]
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