Results 141 to 150 of about 950 (173)
Some of the next articles are maybe not open access.
Biopterin cofactor and monoamine-synthesizing monooxygenases
Neurochemistry International, 1983The activities of three pterin-requiring monooxygenases, phenylalanine hydroxylase, tyrosine hydroxylase and tryptophan hydroxylase, are regulated by the level of the pterin cofactor, (6R)- l -erythro- tetrahydrobiopterin , which is synthesized from guanosine triphosphate (GTP).
openaire +2 more sources
Biosynthesis of biopterin in Ascaris lumbricoides suum
Biochimica et Biophysica Acta (BBA) - General Subjects, 1980In in vivo experiments, radioactivity from [U-14C]GTP was incorporated into biopterin, and, in fact, all carbon atoms of biopterin synthesized in Ascaris lumbricoides suum originated from GTP. Biopterin was also biosynthesized in homogenates of tissue fluid and muscles of Ascaris lumbricoides suum.
H, Otsuka, K, Sugiura, M, Goto
openaire +2 more sources
Pteridine, LXXV. Synthese und Eigenschaften von Biopterin und Biopterin‐Analogen
Liebigs Annalen der Chemie, 1984AbstractDie Synthese von Biopterin (6), seinem 2‐N,N‐Dimethyl‐ (8) und 4‐ Thioxo‐Derivat (19) sowie von Biolumazin (7) wird beschrieben. Durch Umsetzung von Biopterin mit α‐Acetoxyisobuttersäurechlorid läß sich die Seitenkette zu 6‐(L‐threo‐2‐Acetoxy‐1‐chlorpropyl)pterin (10) modifizieren, das als Ausgangsmaterial fär weitere Derivatisierungen dienen ...
Mathias Kappel +2 more
openaire +1 more source
Biopterin Synthesis Defects: Problems in Diagnosis
Pediatrics, 1984Hyperphenylalaninemia due to a biopterin synthesis defect was detected in an infant with decreased biopterin and increased neopterin levels in plasma and urine. Tetrahydrobiopterin (BH4) administration normalized plasma phenylalanine levels. CSF biopterin and neurotransmitter metabolite levels were normal and with the infant's normal growth and ...
G, Hoganson +7 more
openaire +2 more sources
Urinary levels of neopterin and biopterin in Autism
Neuroscience Letters, 1998The pterins, neopterin and biopterin, occur naturally in body fluids including urine. It is well established that increased neopterin levels are associated with activation of the cellular immune system and that reduced biopterins are essential for neurotransmitter synthesis.
S, Messahel +5 more
openaire +2 more sources
Hyperphenylalaninaemia caused by defects in biopterin metabolism
Journal of Inherited Metabolic Disease, 1985AbstractThe hepatic phenylalanine hydroxylating system consists of three essential components, phenylalanine hydroxylase, dihydropteridine reductase and the non‐protein coenzyme, tetrahydrobiopterin. The reductase and the pterin coenzyme are also essential components of the tyrosine and tryptophan hydroxylating systems.
openaire +2 more sources
The Effect of Exercise on Plasma Biopterin Levels
Neuropsychobiology, 2008The plasma total biopterin and tetrahydrobiopterin levels of 29 normal volunteers were measured before and after exercise by ergometer, and those of 10 were also measured until 24 h after exercise. An increase of plasma total biopterin and tetrahydrobiopterin was observed only after strong exercise, which exhausted the subjects, the ratio of ...
M, Mizutani +4 more
openaire +2 more sources
Biopterin: Reduced form in Ascaris lumbricoides
Experimental Parasitology, 1970Abstract A blue fluorescent substance which was supposed to be “Ascaris-blue” was extracted from Ascaris muscle. After Chromatographic purification, the substance was identified as biopterin, 2-amino-4-hydroxy-6-(erythro-1′, 2′-dihydroxypropyl)pteridine.
openaire +2 more sources
Reindarstellung von Biopterin und 7-Biopterin
Hoppe-Seyler´s Zeitschrift für physiologische Chemie, 1962H. Rembold, H. Metzger
openaire +1 more source