isoalloxazine - определение. Что такое isoalloxazine
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Что (кто) такое isoalloxazine - определение

GROUP OF CHEMICAL COMPOUNDS
Flavine; Riboflavin mononucleotide; Flavins; Isoalloxazine ring
  • There are 18 key atoms in [[isoalloxazine]] that make up its characteristic three-ring structure. The R-group varies and differentiates various flavins.

Flavine         
·noun A yellow, crystalline, organic base, C13H12N2O, obtained artificially.
riboflavin         
  • Riboflavin is the biosynthetic precursor of FMN and FAD
  • 650px
  • Cultures of ''Micrococcus luteus'' growing on pyridine (left) and succinic acid (right). The pyridine culture has turned yellow from the accumulation of riboflavin.<ref name="Sims1992"/>
  • 650px
  • 500px
CHEMICAL COMPOUND
Vitamin B2; Vitamin G; Vitamin B2 Deficiency; Riboflavin phosphate sodium; Ariboflavinosis; Vitamin B-2; Riboflavin deficiency; Riboflavin metabolism; Lactoflavin; Riboflavins; Vitamin B2 deficiency; Riboflavin biosynthesis; Vitamin B₂; C17H20N4O6; ATC code A11HA04; ATCvet code QA11HA04; List of foods containing Vitamin G; Aqua-Flave; Beflavin; Beflavine; Bisulase; Dermadram; Fiboflavin; Flavaxin; Flavin Bb; Flaxain; HSDB 817; Hyflavin; Hyre; Lactobene; Ovoflavin; Ribipca; Ribocrisina; Riboderm; Ribosyn; Ribotone; Ribovel; Vitaflavine; Vitasan B2; E101 (E number)
Riboflavin is a vitamin that occurs in green vegetables, milk, fish, eggs, liver, and kidney.
N-UNCOUNT
riboflavin         
  • Riboflavin is the biosynthetic precursor of FMN and FAD
  • 650px
  • Cultures of ''Micrococcus luteus'' growing on pyridine (left) and succinic acid (right). The pyridine culture has turned yellow from the accumulation of riboflavin.<ref name="Sims1992"/>
  • 650px
  • 500px
CHEMICAL COMPOUND
Vitamin B2; Vitamin G; Vitamin B2 Deficiency; Riboflavin phosphate sodium; Ariboflavinosis; Vitamin B-2; Riboflavin deficiency; Riboflavin metabolism; Lactoflavin; Riboflavins; Vitamin B2 deficiency; Riboflavin biosynthesis; Vitamin B₂; C17H20N4O6; ATC code A11HA04; ATCvet code QA11HA04; List of foods containing Vitamin G; Aqua-Flave; Beflavin; Beflavine; Bisulase; Dermadram; Fiboflavin; Flavaxin; Flavin Bb; Flaxain; HSDB 817; Hyflavin; Hyre; Lactobene; Ovoflavin; Ribipca; Ribocrisina; Riboderm; Ribosyn; Ribotone; Ribovel; Vitaflavine; Vitasan B2; E101 (E number)
[?r??b?(?)'fle?v?n]
¦ noun Biochemistry vitamin B2, a yellow compound essential for energy production and present especially in milk, liver, and green vegetables.
Origin
1930s: from ribose + L. flavus 'yellow' + -in1.

Википедия

Flavin group

Flavins (from Latin flavus, "yellow") are organic compounds, like their base, pteridine. They are formed by the tricyclic heterocycle isoalloxazine. The biochemical source is the vitamin riboflavin. The flavin moiety is often attached with an adenosine diphosphate to form flavin adenine dinucleotide (FAD), and, in other circumstances, is found as flavin mononucleotide (or FMN), a phosphorylated form of riboflavin. It is in one or the other of these forms that flavin is present as a prosthetic group in flavoproteins.

The flavin group is capable of undergoing oxidation-reduction reactions, and can accept either one electron in a two-step process or two electrons at once. Reduction is made with the addition of hydrogen atoms to specific nitrogen atoms on the isoalloxazine ring system:

In aqueous solution, flavins are yellow-coloured when oxidized, taking a red colour in the semi-reduced anionic state or blue in the neutral (semiquinone) state, and colourless when totally reduced. The oxidized and reduced forms are in fast equilibrium with the semiquinone (radical) form, shifted against the formation of the radical:

Flox + FlredH2 ⇌ FlH

where Flox is the oxidized flavin, FlredH2 the reduced flavin (upon addition of two hydrogen atoms) and FlH the semiquinone form (addition of one hydrogen atom).

In the form of FADH2, it is one of the cofactors that can transfer electrons to the electron transfer chain.