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Identification
YMDB IDYMDB00686
NameFMNH2
SpeciesSaccharomyces cerevisiae
StrainBaker's yeast
DescriptionFMNH2, also known as FMNH or reduced FMN, belongs to the class of organic compounds known as flavin nucleotides. These are nucleotides containing a flavin moiety. Flavin is a compound that contains the tricyclic isoalloxazine ring system, which bears 2 oxo groups at the 2- and 4-positions. FMNH2 is an extremely weak basic (essentially neutral) compound (based on its pKa). FMNH2 exists in all living species, ranging from bacteria to humans.
Structure
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Synonyms
  • 1,5-dihydroriboflavin 5'-(dihydrogen phosphate)
  • flavin mononucleotide (reduced)
  • FMNH2
  • Reduced FMN
  • FMNH
  • 1,5-Dihydroriboflavin 5'-(dihydrogen phosphoric acid)
  • Reduced flavin mononucleotide
  • Flavin mononucleotide hydroquinone
CAS numberNot Available
WeightAverage: 458.3597
Monoisotopic: 458.120264866
InChI KeyYTNIXZGTHTVJBW-SCRDCRAPSA-N
InChIInChI=1S/C17H23N4O9P/c1-7-3-9-10(4-8(7)2)21(15-13(18-9)16(25)20-17(26)19-15)5-11(22)14(24)12(23)6-30-31(27,28)29/h3-4,11-12,14,18,22-24H,5-6H2,1-2H3,(H2,27,28,29)(H2,19,20,25,26)/t11-,12+,14-/m0/s1
IUPAC Name{[(2R,3S,4S)-5-{7,8-dimethyl-2,4-dioxo-1H,2H,3H,4H,5H,10H-benzo[g]pteridin-10-yl}-2,3,4-trihydroxypentyl]oxy}phosphonic acid
Traditional IUPAC Namefmnh(.)
Chemical FormulaC17H23N4O9P
SMILESCC1=C(C)C=C2N(C[C@H](O)[C@H](O)[C@H](O)COP(O)(O)=O)C3=C(NC2=C1)C(=O)NC(=O)N3
Chemical Taxonomy
Description belongs to the class of organic compounds known as flavin nucleotides. These are nucleotides containing a flavin moiety. Flavin is a compound that contains the tricyclic isoalloxazine ring system, which bears 2 oxo groups at the 2- and 4-positions.
KingdomOrganic compounds
Super ClassNucleosides, nucleotides, and analogues
ClassFlavin nucleotides
Sub ClassNot Available
Direct ParentFlavin nucleotides
Alternative Parents
Substituents
  • Flavin nucleotide
  • Flavin
  • Alkyldiarylamine
  • Monosaccharide phosphate
  • Pteridine
  • Pyrimidone
  • Monoalkyl phosphate
  • Monosaccharide
  • Organic phosphoric acid derivative
  • Phosphoric acid ester
  • Pyrimidine
  • Alkyl phosphate
  • Benzenoid
  • Vinylogous amide
  • Heteroaromatic compound
  • Urea
  • Secondary alcohol
  • Lactam
  • Secondary amine
  • Azacycle
  • Organoheterocyclic compound
  • Polyol
  • Hydrocarbon derivative
  • Organonitrogen compound
  • Amine
  • Alcohol
  • Organopnictogen compound
  • Organic oxygen compound
  • Organooxygen compound
  • Organic oxide
  • Organic nitrogen compound
  • Aromatic heteropolycyclic compound
Molecular FrameworkAromatic heteropolycyclic compounds
External Descriptors
Physical Properties
StateSolid
Charge0
Melting pointNot Available
Experimental Properties
PropertyValueReference
Water SolubilityNot AvailablePhysProp
LogPNot AvailablePhysProp
Predicted Properties
PropertyValueSource
Water Solubility0.64 g/LALOGPS
logP-0.17ALOGPS
logP-1.1ChemAxon
logS-2.9ALOGPS
pKa (Strongest Acidic)1.5ChemAxon
pKa (Strongest Basic)-0.52ChemAxon
Physiological Charge-2ChemAxon
Hydrogen Acceptor Count10ChemAxon
Hydrogen Donor Count8ChemAxon
Polar Surface Area200.92 ŲChemAxon
Rotatable Bond Count7ChemAxon
Refractivity118.51 m³·mol⁻¹ChemAxon
Polarizability42.75 ųChemAxon
Number of Rings3ChemAxon
Bioavailability0ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Biological Properties
Cellular Locations
  • mitochondrion
  • cytoplasm
Organoleptic PropertiesNot Available
SMPDB Pathways
Riboflavin metabolismPW002443 ThumbThumb?image type=greyscaleThumb?image type=simple
KEGG Pathways
Riboflavin metabolismec00740 Map00740
SMPDB Reactions
alkylsulfonate + FMNH2 + oxygen → Betaine aldehyde + Sulfite + Flavin Mononucleotide + water + hydron
KEGG Reactions
NADH + Flavin Mononucleotide + hydronNAD + FMNH2
Flavin Mononucleotide + NADPH + hydronNADP + FMNH2
Fumaric acid + FMNH2Flavin Mononucleotide + Succinic acid
Concentrations
Intracellular ConcentrationsNot Available
Extracellular ConcentrationsNot Available
Spectra
Spectra
References
References:
  • UniProt Consortium (2011). "Ongoing and future developments at the Universal Protein Resource." Nucleic Acids Res 39:D214-D219.21051339
  • Scheer, M., Grote, A., Chang, A., Schomburg, I., Munaretto, C., Rother, M., Sohngen, C., Stelzer, M., Thiele, J., Schomburg, D. (2011). "BRENDA, the enzyme information system in 2011." Nucleic Acids Res 39:D670-D676.21062828
  • Herrgard, M. J., Swainston, N., Dobson, P., Dunn, W. B., Arga, K. Y., Arvas, M., Bluthgen, N., Borger, S., Costenoble, R., Heinemann, M., Hucka, M., Le Novere, N., Li, P., Liebermeister, W., Mo, M. L., Oliveira, A. P., Petranovic, D., Pettifer, S., Simeonidis, E., Smallbone, K., Spasic, I., Weichart, D., Brent, R., Broomhead, D. S., Westerhoff, H. V., Kirdar, B., Penttila, M., Klipp, E., Palsson, B. O., Sauer, U., Oliver, S. G., Mendes, P., Nielsen, J., Kell, D. B. (2008). "A consensus yeast metabolic network reconstruction obtained from a community approach to systems biology." Nat Biotechnol 26:1155-1160.18846089
  • Sharp, R. E., Chapman, S. K., Reid, G. A. (1996). "Modulation of flavocytochrome b2 intraprotein electron transfer via an interdomain hinge region." Biochem J 316 ( Pt 2):507-513.8687394
  • Hazzard, J. T., McDonough, C. A., Tollin, G. (1994). "Intramolecular electron transfer in yeast flavocytochrome b2 upon one-electron photooxidation of the fully reduced enzyme: evidence for redox state control of heme-flavin communication." Biochemistry 33:13445-13454.7947753
  • Liger, D., Graille, M., Zhou, C. Z., Leulliot, N., Quevillon-Cheruel, S., Blondeau, K., Janin, J., van Tilbeurgh, H. (2004). "Crystal structure and functional characterization of yeast YLR011wp, an enzyme with NAD(P)H-FMN and ferric iron reductase activities." J Biol Chem 279:34890-34897.15184374
Synthesis Reference:Not Available
External Links:
ResourceLink
CHEBI ID16048
HMDB IDHMDB0001142
Pubchem Compound ID44229161
Kegg IDC01847
ChemSpider ID393046
FOODB IDFDB022449
WikipediaFlavin_mononucleotide
BioCyc IDFMNH2

Enzymes

General function:
Involved in nitronate monooxygenase activity
Specific function:
Catalyzes the oxidation of alkyl nitronates to produce the corresponding carbonyl compounds and nitrites
Gene Name:
Not Available
Uniprot ID:
P47177
Molecular weight:
45142.60156
Reactions
Ethylnitronate + O(2) + FMNH(2) → acetaldehyde + nitrite + FMN + H(2)O.
General function:
Involved in pyridoxamine-phosphate oxidase activity
Specific function:
Catalyzes the oxidation of either pyridoxine 5'- phosphate (PNP) or pyridoxamine 5'-phosphate (PMP) into pyridoxal 5'-phosphate (PLP)
Gene Name:
PDX3
Uniprot ID:
P38075
Molecular weight:
26908.0
Reactions
Pyridoxamine 5'-phosphate + H(2)O + O(2) → pyridoxal 5'-phosphate + NH(3) + H(2)O(2).
Pyridoxine 5'-phosphate + O(2) → pyridoxal 5'-phosphate + H(2)O(2).
General function:
Involved in electron carrier activity
Specific function:
Could be a fumarate reductase
Gene Name:
Not Available
Uniprot ID:
P32614
Molecular weight:
50843.69922
Reactions
Succinate + NAD(+) → fumarate + NADH.
General function:
Involved in electron carrier activity
Specific function:
Could be a fumarate reductase
Gene Name:
OSM1
Uniprot ID:
P21375
Molecular weight:
55064.80078
Reactions
General function:
Involved in FMN reductase activity
Specific function:
Has several reductase activities that are NAD(P)H- dependent and involve FMN as a cofactor, ferricyanide being the best substrate for reduction. May be involved in ferric iron assimilation
Gene Name:
LOT6
Uniprot ID:
Q07923
Molecular weight:
21280.40039
Reactions
FMNH(2) + NAD(P)(+) → FMN + NAD(P)H.