Titlebook: Chemistry and Biology of Pteridines and Folates; June E. Ayling,M. Gopal Nair,Charles M. Baugh Book 1993 The Editor(s) (if applicable) and

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開始發(fā)作

Benign

Expression of Wild Type and Mutant Forms of Human Phenylalanine Hydroxylase in ,. ,ne hydroxylase (phenylalanine 4-monooxygenase, EC 1.14.16.1, PAH). The loss of enzymatic activity found in PKU patients is a result of single base substitutions or small deletions in the PAH gene. Presently, more than 70 different mutations associated with the disease are known. PKU and non-PKU hype

蕨類

A Re-Examination of the Metal Requirement of , Phenylalanine Hydroxylaseand tryptophan hydroxylase. All of the mammalian forms of these enzymes have a non-heme iron required for activity. . Though no direct experimental evidence ascribes a mechanistic role to the metal, it is thought that the metal ion is required to be in its lower oxidation state for activity..

FORGO

赤字

Characterization of the Iron Environment in Recombinant Human Tyrosine Hydroxylase, Using M?ssbauer the biosynthesis of catecholamines.. The enzyme isolated either from bovine adrenals or rat pheochromocytoma cells contains approximately one atom of tightly bound non-heme iron/subunit.. However, the ligands to the iron or its catalytic function is not known. An important question has been the red

NAVEN

Interaction of Substrate and Pterin Cofactor with the Metal of Human Tyrosine Hydroxylase as Determiorms (hTHl to hTH4) which have been expressed in .. ... The purified apoenzymes are rapidly activated (up to 40-fold) by the incorporation of stoichiometric amounts of Fe.. All isozymes are competitively inhibited by other divalent metal ions, e.g. Zn., Co. and Ni. which bind with similar affinity a

友好關(guān)系

Mechanistic Studies of Tyrosine Hydroxylaseydroxyphenylalanine.. The other substrates for the reaction are molecular oxygen and a tetrahydropterin. In addition, tyrosine hydroxylase requires one atom of ferrous iron per active site for activity.; the role of the iron atom is unknown. While the central position of tyrosine hydroxylase in the

反抗者

Alleviation of Catecholamine Inhibition of Tyrosine Hydroxylase by Phosphorylation at Serine40-dihydroxyphenylalanine with the oxidation of tetrahydrobiopterin to dihydrobiopterin.. The activity of TYH is highly regulated. Tyrosine hydroxylase is inhibited by catecholamines and high levels of tyrosine, and activated by anions, polyanions, phospholipids and phosphorylation.. cAMP-Dependent pr

夸張

Glyceryl Ether Monooxygenase [EC 1.14.16.5]: Stoichiometry and Inhibitiony alcohols. The reaction requires oxygen and a tetrahydropterin cofactor. It is a mixed-function oxidase and by analogy with phenylalanine hydroxylase the reaction shown in Scheme . was postulated.1 We investigated aspects of the stoichiometry of the oxygenase because two earlier reports were not en