Exact Mass: 239.1018
Exact Mass Matches: 239.1018
Found 39 metabolites which its exact mass value is equals to given mass value 239.1018,
within given mass tolerance error 0.0002 dalton. Try search metabolite list with more accurate mass tolerance error
4.0E-5 dalton.
Dihydrobiopterin
Dihydrobiopterin, also known as BH2, 7,8-dihydrobiopterin, L-erythro-7,8-dihydrobiopterin, quinonoid dihydrobiopterin or q-BH2, belongs to the class of organic compounds known as biopterins and derivatives. These are coenzymes containing a 2-amino-pteridine-4-one derivative. Dihydrobiopterin is also classified as a pteridine. Pteridines are aromatic compounds composed of fused pyrimidine and pyrazine rings. Dihydrobiopterin is produced during the synthesis of neurotransmitters L-DOPA, dopamine, norepinephrine and epinephrine. It is restored to the required cofactor tetrahydrobiopterin via the NADPH-dependant reduction of dihydrobiopterin reductase. Dihydrobiopterin can also be converted to tetrahydrobiopterin by nitric oxide synthase (NOS) which is catalyzed by the flavoprotein "diaphorase" activity of NOS. This activity is located on the reductase (C-terminal) domain of NOS, whereas the high affinity tetrahydrobiopterin site involved in NOS activation is located on the oxygenase (N-terminal) domain (PMID: 8626754). Sepiapterin reductase (SPR) is another enzyme that plays a role in the production of dihydrobiopterin. SPR catalyzes the reduction of sepiapterin to dihydrobiopterin (BH2), the precursor for tetrahydrobiopterin (BH4). BH4 is a cofactor critical for nitric oxide biosynthesis and alkylglycerol and aromatic amino acid metabolism (PMID: 25550200). Dihydrobiopterin is known to be synthesized in several parts of the body, including the pineal gland. Dihydrobiopterin exists in all eukaryotes, ranging from yeast to humans. In humans, dihydrobiopterin is involved in several metabolic disorders including dihydropteridine reductase (DHPR) deficiency. DHPR deficiency is a severe form of hyperphenylalaninemia (HPA) due to impaired regeneration of tetrahydrobiopterin (BH4) leading to decreased levels of neurotransmitters (dopamine, serotonin) and folate in cerebrospinal fluid, and causing neurological symptoms such as psychomotor delay, hypotonia, seizures, abnormal movements, hypersalivation, and swallowing difficulties. Dihydrobiopterin is also associated with another metabolic disorder known as sepiapterin reductase deficiency (SRD). Sepiapterin reductase catalyzes the (NADP-dependent) reduction of carbonyl derivatives, including pteridines, and plays an important role in tetrahydrobiopterin biosynthesis. Low dihydrofolate reductase activity in the brain leads to the accumulation of dihydrobiopterin, which in turn, inhibits tyrosine and tryptophan hydroxylases. This uncouples neuronal nitric oxide synthase, leading to neurotransmitter deficiencies and neuronal cell death. SRD is characterized by low cerebrospinal fluid neurotransmitter levels and the presence of elevated cerebrospinal fluid dihydrobiopterin. SRD is characterized by motor delay, axial hypotonia, language delay, diurnal fluctuation of symptoms, dystonia, weakness, oculogyric crises, dysarthria, parkinsonian signs and hyperreflexia. Dihydrobiopterin (BH2) is an oxidation product of tetrahydrobiopterin. Tetrahydrobiopterin is a natural occurring cofactor of the aromatic amino acid hydroxylase and is involved in the synthesis of tyrosine and the neurotransmitters dopamine and serotonin. Tetrahydrobiopterin is also essential for nitric oxide synthase catalyzed oxidation of L-arginine to L-citrulline and nitric oxide. [HMDB] 7,8-Dihydro-L-biopterin is an oxidation product of tetrahydrobiopterin.
4a-Carbinolamine tetrahydrobiopterin
Carbinolamine 4a-hydroxytetrahydrobiopterin is formed as a consequence of the hydroxylation of phenylalanine to tyrosine. During the physiological reaction tetrahydrobiopterin (the naturally occurring cofactor for phenylalanine hydroxylase), and the two substrates phenylalanine and molecular oxygen combine with phenylalanine hydroxylase to form a quarternary complex. An enzyme, 4a-carbinolamine dehydratase, catalyzes the reaction. (PMID: 2722790) [HMDB] Carbinolamine 4a-hydroxytetrahydrobiopterin is formed as a consequence of the hydroxylation of phenylalanine to tyrosine. During the physiological reaction tetrahydrobiopterin (the naturally occurring cofactor for phenylalanine hydroxylase), and the two substrates phenylalanine and molecular oxygen combine with phenylalanine hydroxylase to form a quarternary complex. An enzyme, 4a-carbinolamine dehydratase, catalyzes the reaction. (PMID: 2722790). COVID info from COVID-19 Disease Map Corona-virus Coronavirus SARS-CoV-2 COVID-19 SARS-CoV COVID19 SARS2 SARS
6-Lactoyltetrahydropterin
6-Lactoyltetrahydropterin is a putative intermediate in the de novo synthesis of tetrahydrobiopterin (BH4) pathway, in a reaction involving the enzyme sepiapterin reductase (E.C. 1.1.1.153) in human liver. In brain, an enzyme distinct from sepiapterin reductase catalyzes the TPNH-dependent reduction of 6-pyruvoyl-tetrahydropterin to 6-lactoyl-tetrahydropterin. (PMID: 4004850). In brain, the expression of other enzymes involved in BH4 biosynthesis includes aldose reductase, carbonyl reductase, GTP-cyclohydrolase I, and 6-pyruvoyltetrahydrobiopterin. Sepiapterin reductase expression is increased in Parkinsons disease brain tissue. (PMID: 17270157). 6-Lactoyltetrahydropterin is a putative intermediate in the de novo synthesis of tetrahydrobiopterin (BH4) pathway, in a reaction involving the enzyme sepiapterin reductase (E.C. 1.1.1.153) in human liver. In brain, an enzyme distinct from sepiapterin reductase catalyzes the TPNH-dependent reduction of 6-pyruvoyl-tetrahydropterin to 6-lactoyl-tetrahydropterin. (PMID: 4004850)
1-hydroxy-2-Oxopropyl tetrahydropterin
1-hydroxy-2-Oxopropyl tetrahydropterin, an intermediate formed from 6-Pyrovoyl-Tetrahydropterin in the biosynthetic pathway of tetrahydrobiopterin [PMID: 19234759]. [HMDB] 1-hydroxy-2-Oxopropyl tetrahydropterin, an intermediate formed from 6-Pyrovoyl-Tetrahydropterin in the biosynthetic pathway of tetrahydrobiopterin [PMID: 19234759].
O2'-4a-cyclic-tetrahydrobiopterin
O2-4a-cyclic-tetrahydrobiopterin is a novel pterin intermediate, in addition to the expected 4a-hydroxytetrahydrobiopterin (4a-OH-BH4) and quinonoid dihydrobiopterin generated during catalytic turnover of tyrosine hydroxylase (TH) with tetrahydrobiopterin as the cofactor. Its conversion into quinonoid dihydrobiopterin is catalysed by pterin-4a-carbinolamine dehydratase.
D-Erythro-7,8-dihydrobiopterin
dihydrobiopterin
7,8-Dihydro-L-biopterin is an oxidation product of tetrahydrobiopterin.
7,8-Dihydro-L-biopterin
7,8-Dihydro-L-biopterin is an oxidation product of tetrahydrobiopterin.
4-Methylamino-6-morpholin-4-yl-[1,3,5]triazine-2-carboxylic acid
9-(3,4-Dihydroxybutyl)guanine
D000890 - Anti-Infective Agents > D000998 - Antiviral Agents
(6R)-6-lactoyl-5,6,7,8-tetrahydropterin
A 6-lactoyl-5,6,7,8-tetrahydropterin in which the stereocentre at position 6 has R-configuration.
(6R)-6-(L-erythro-1,2-Dihydroxypropyl)-7,8-dihydro-6H-pterin
2-amino-6-(2-hydroxypropanoyl)-4a,7,8,8a-tetrahydro-3H-pteridin-4-one
(2S)-2-amino-N-[(Z)-(4-methyl-2,6-dioxo-5-pyrimidinylidene)methyl]propanehydrazide;hydrochloride
2-amino-6-[(1R)-1,2-dihydroxypropyl]-7,8-dihydro-1H-pteridin-4-one
6,7-Dihydrobiopterin
COVID info from COVID-19 Disease Map Corona-virus Coronavirus SARS-CoV-2 COVID-19 SARS-CoV COVID19 SARS2 SARS
(6R)-D-erythro-6,7-dihydrobiopterin
A 6,7-dihydrobiopterin that has R configuration at position 6 and in which the 1,2-dihydroxypropyl substituent has 1S,2R configuration.
(6R)-L-erythro-6,7-dihydrobiopterin
A 6,7-dihydrobiopterin that has R configuration at position 6 and in which the 1,2-dihydroxypropyl substituent has 1R,2S configuration.
