Search results for "Retinoic acid binding"

showing 2 items of 2 documents

Vitamin E activates CRABP-II gene expression in cultured human fibroblasts, role of protein kinase C

2004

The treatment of human fibroblasts with different tocopherols in the presence of retinol caused an increase in cytoplasmic retinoic acid binding protein II (CRABP-II) mRNA and protein. The possibility of an involvement of protein kinase C (PKC) in the response to tocopherols was supported by the results obtained with the PKC-specific inhibitors, calphostin C and bisindolylmaleimide I. The effect of alpha-tocopherol was prevented by okadaic acid, suggesting that a protein phosphatase is responsible for PKC dephosphorylation produced by the presence of tocopherols. The results shown support the hypothesis that phosphorylation/dephosphorylation of RXRalpha via PKC may be involved in the regula…

MaleBisindolylmaleimideTranscription GeneticReceptors Retinoic AcidPhosphatasealpha-TocopherolBiophysicsBiochemistryDephosphorylationchemistry.chemical_compoundStructural BiologyProtein kinase COkadaic AcidGeneticsHumansVitamin ERNA MessengerRetinoic acid bindingPhosphorylationMolecular BiologyProtein kinase CCells CulturedDNA PrimersBase SequenceReverse Transcriptase Polymerase Chain ReactionInfant NewbornRetinoid X receptor αCell BiologyMolecular biologyRetinoic acid receptorCalphostin CchemistryGene Expression RegulationProtein phosphatasePhosphorylationFibroblastCytoplasmic retinoic acid binding protein IIFEBS Letters
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Xanthine oxidase catalyzes the oxidation of retinol.

2007

In mammals, xanthine oxidase (E.C. 1.17.3.2) catalyzes the hydroxylation of a wide variety of heterocyclic substrates such as purines, pyrimidines, and pterins, in addition to aldehydes [1] as all-trans-retinaldehyde [2-5]. Here, we show that buttermilk xanthine oxidase was capable to oxidizing all-trans-retinol (t-ROL) to all-trans-retinaldehyde (t-RAL) that was successively oxidized to all-trans-retinoic acid (t-RA). A rise in the enzyme activity, when t-ROL-CRBP complex was assayed, with respect to the free t-ROL, was observed. Furthermore, treatment of the enzyme with Na2S and glutathione resulted in a significant increment in catalytic activity toward t-ROL and t-RAL, due to the recons…

Xanthine OxidaseReceptors Retinoic Acidchemistry.chemical_elementTretinoinHydroxylationLigandsCatalysisHydroxylationchemistry.chemical_compoundRetinoidsDrug DiscoveryHumansXanthine oxidasePurine metabolismVitamin APharmacologychemistry.chemical_classificationHypoxanthinebiologyEthanolRetinol-Binding Proteins CellularGeneral MedicineGlutathioneEnzyme assayOxygenRetinol-Binding ProteinsKineticsEnzymechemistryBiochemistryXanthine dehydrogenaseMolybdenumbiology.proteinXanthine oxidase retinol oxidation retinaldehyde oxidation retinoic acid biosynthesis cellular retinoid binding protein (CRBP) Cellular retinoic acid binding protein (CRABP) retinol binding protein (RBP)Journal of enzyme inhibition and medicinal chemistry
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