hydroxylase


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hydroxylase

[hī′dräk·sə‚lās]
(biochemistry)
Any of several enzymes that catalyze certain hydroxylation reactions involving atomic oxygen.
References in periodicals archive ?
Keywords: Mutation, Phenylalanine hydroxylase, Phenylketonurias, Population
Increased expression of 1-alpha hydroxylase in alveolar macrophages associated with lung cancer is possible.
TH: tyrosine hydroxylase; AADC: aromatic amino acid decarboxylase; DBH: dopamine B-hydroxylase; PNMT: phenylethanolamine-N-methyltransferase; COMT: catechol-O-methyltransferase.
(9) The progesterone level was high, but 17 hydroxy progesterone was undetectable because of the absence of 17 hydroxylase activity.
CAH due to 21 hydroxylase deficiency is one of the most common autosomal recessive hereditary diseases.2-4 In Caucasians, 1-2% of hyperandrogenism syndromes are due to late onset NC-CAH.5,6 In NC-CAH, about 20-50% of 21-hydroxylase activity is preserved, and it usually presents with a mild androgen excess in late childhood or during adolescence.
Paragangliomas located in the skull base, head and neck, and thyroid are associated with the parasympathetic nervous system, which often lacks tyrosine hydroxylase (the rate-limiting step in dopamine synthesis).
Other enzymes like 11-beta hydroxylase and 3- beta hydroxysteroid dehydrogenase deficiency can also cause CAH which is rare.
Little Oranye Chimweokwu Sayne was brought to Max Super Speciality Hospital, Shalimar Bagh recently where she was diagnosed with a rare genetic disorder called Congenital Adrenal Hyperplasia whereby the body does not produce the vital 21- hydroxylase enzyme leading to enlargement of the clitoris.
It was discovered that calcitriol activates the transcription of tryptophan hydroxylase 2, a gene that converts the amino acid tryptophan to serotonin in the brain.
He and his coinvestigators had suspected the existence of such a link, based upon their prior observations that uric acid inhibits expression of 1-alpha hydroxylase protein in vivo and that elevated uric acid levels are associated with higher parathyroid hormone levels in humans.