2002
Coexpression of Wild-Type Tyrosinase Enhances Maturation of Temperature-Sensitive Tyrosinase Mutants
Halaban R, Cheng E, Hebert DN. Coexpression of Wild-Type Tyrosinase Enhances Maturation of Temperature-Sensitive Tyrosinase Mutants. Journal Of Investigative Dermatology 2002, 119: 481-488. PMID: 12190874, DOI: 10.1046/j.1523-1747.2002.01824.x.Peer-Reviewed Original ResearchConceptsWild-type proteinTyrosinase mutantsMutant proteinsGlycosylation-deficient mutantsGlycosylation-deficient formsOculocutaneous albinism 1Wild-type tyrosinaseDevelopment of pigmentsDifferent mutant allelesType I membraneActivity-dependent mannerNonpermissive temperatureMutant allelesEndoplasmic reticulumTypes of mutationsMutantsFunction mutationsCarbohydrate processingMelanin synthesisProteinCoexpressionMelanocytesTyrosinase activityMutationsMaturation
2000
Proper Folding and Endoplasmic Reticulum to Golgi Transport of Tyrosinase Are Induced by Its Substrates, DOPA and Tyrosine*
Halaban R, Cheng E, Svedine S, Aron R, Hebert D. Proper Folding and Endoplasmic Reticulum to Golgi Transport of Tyrosinase Are Induced by Its Substrates, DOPA and Tyrosine*. Journal Of Biological Chemistry 2000, 276: 11933-11938. PMID: 11124258, DOI: 10.1074/jbc.m008703200.Peer-Reviewed Original ResearchConceptsWild-type tyrosinaseEndoplasmic reticulumProper foldingWild-type proteinMelanoma cellsLoss of pigmentationTyrosinase-positive melanoma cellsGolgi transportType proteinAlbino mutantS proteasomeSubsequent retranslocationMutant formsCatalytic stateEnzymatic activityProteolytic degradationNative formReticulumFoldingProteinTumor-derived antigenic peptidesTyrosinase activitySuppress tyrosinase activityCellsMetabolic changesTranslation Rate of Human Tyrosinase Determines ItsN-Linked Glycosylation Level*
Újvári A, Aron R, Eisenhaure T, Cheng E, Parag H, Smicun Y, Halaban R, Hebert D. Translation Rate of Human Tyrosinase Determines ItsN-Linked Glycosylation Level*. Journal Of Biological Chemistry 2000, 276: 5924-5931. PMID: 11069924, DOI: 10.1074/jbc.m009203200.Peer-Reviewed Original ResearchConceptsTranslation rateCell-free systemProtein translation ratesType I membrane glycoproteinsNormal melanocytesHuman tyrosinaseSemi-permeabilized cellsMelanoma cellsUbiquitin-proteasomal pathwayRate of translationSite-directed mutagenesisWild-type tyrosinaseProtein synthesis inhibitor cycloheximideInefficient glycosylationGlycosylation efficiencyAberrant retentionProtein translationCotranslational eventsConsensus sitesCore glycanDegradative fateProtein doubletEndoplasmic reticulumMaturation eventsAmelanotic melanoma cellsEndoplasmic reticulum retention is a common defect associated with tyrosinase-negative albinism
Halaban R, Svedine S, Cheng E, Smicun Y, Aron R, Hebert D. Endoplasmic reticulum retention is a common defect associated with tyrosinase-negative albinism. Proceedings Of The National Academy Of Sciences Of The United States Of America 2000, 97: 5889-5894. PMID: 10823941, PMCID: PMC18529, DOI: 10.1073/pnas.97.11.5889.Peer-Reviewed Original ResearchMeSH KeywordsAlbinism, OculocutaneousAmino Acid SubstitutionAnimalsCalcium-Binding ProteinsCalnexinCalreticulinCells, CulturedEndoplasmic ReticulumGolgi ApparatusHumansMelanocytesMelanosomesMiceMice, Mutant StrainsMicroscopy, FluorescenceMonophenol MonooxygenasePoint MutationProtein BindingProtein FoldingRecombinant Fusion ProteinsRibonucleoproteinsTransfection
1997
Aberrant retention of tyrosinase in the endoplasmic reticulum mediates accelerated degradation of the enzyme and contributes to the dedifferentiated phenotype of amelanotic melanoma cells
Halaban R, Cheng E, Zhang Y, Moellmann G, Hanlon D, Michalak M, Setaluri V, Hebert D. Aberrant retention of tyrosinase in the endoplasmic reticulum mediates accelerated degradation of the enzyme and contributes to the dedifferentiated phenotype of amelanotic melanoma cells. Proceedings Of The National Academy Of Sciences Of The United States Of America 1997, 94: 6210-6215. PMID: 9177196, PMCID: PMC21028, DOI: 10.1073/pnas.94.12.6210.Peer-Reviewed Original ResearchMeSH KeywordsAdultCalcium-Binding ProteinsCalnexinCalreticulinCell DifferentiationCells, CulturedCoculture TechniquesEndoplasmic ReticulumEnzyme PrecursorsHumansInfant, NewbornKineticsMelanocytesMelanomaMolecular ChaperonesMolecular WeightMonophenol MonooxygenasePhenotypeRibonucleoproteinsSkin NeoplasmsTime FactorsTumor Cells, CulturedConceptsEndoplasmic reticulumNormal melanocytesER chaperone calnexinMelanin synthesisMalignant melanocytesMelanoma cellsChaperone bindingAberrant retentionChaperone calnexinGolgi compartmentSubcellular localizationAmelanotic melanoma cell lineKey enzymeMelanoma cell linesMaturation of tyrosinaseAmelanotic melanoma cellsKinetics of synthesisInhibitor sensitivityDedifferentiated phenotypeProteolytic degradationCell linesProteasome inhibitorsEnzymeProteasomeImmature forms