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dc.contributor.authorMesa-Torres, Noel
dc.contributor.authorFabelo-Rosa, Israel
dc.contributor.authorRiverol, Debora
dc.contributor.authorYunta, Cristina
dc.contributor.authorAlbert, Armando
dc.contributor.authorSalido, Eduardo
dc.contributor.authorPey, Ángel L.
dc.identifier.citationMesa-Torres, N.; et al. The Role of Protein Denaturation Energetics and Molecular Chaperones in the Aggregation and Mistargeting of Mutants Causing Primary Hyperoxaluria Type I. Plos One, 8(8): e71963 (2013). []es_ES
dc.identifier.otherdoi: 10.1371/journal.pone.0071963
dc.description.abstractPrimary hyperoxaluria type I (PH1) is a conformational disease which result in the loss of alanine:glyoxylate aminotransferase (AGT) function. The study of AGT has important implications for protein folding and trafficking because PH1 mutants may cause protein aggregation and mitochondrial mistargeting. We herein describe a multidisciplinary study aimed to understand the molecular basis of protein aggregation and mistargeting in PH1 by studying twelve AGT variants. Expression studies in cell cultures reveal strong protein folding defects in PH1 causing mutants leading to enhanced aggregation, and in two cases, mitochondrial mistargeting. Immunoprecipitation studies in a cell-free system reveal that most mutants enhance the interactions with Hsc70 chaperones along their folding process, while in vitro binding experiments show no changes in the interaction of folded AGT dimers with the peroxisomal receptor Pex5p. Thermal denaturation studies by calorimetry support that PH1 causing mutants often kinetically destabilize the folded apo-protein through significant changes in the denaturation free energy barrier, whereas coenzyme binding overcomes this destabilization. Modeling of the mutations on a 1.9 Å crystal structure suggests that PH1 causing mutants perturb locally the native structure. Our work support that a misbalance between denaturation energetics and interactions with chaperones underlie aggregation and mistargeting in PH1, suggesting that native state stabilizers and protein homeostasis modulators are potential drugs to restore the complex and delicate balance of AGT protein homeostasis in PH1.es_ES
dc.description.sponsorshipThis work was supported by the Spanish ministry of Science and Innovation (RYC2009-04147 and CSD2009-00088 to ALP, SAF2011-23933 to ES, and CSD2006-00015, S2010/BMD-2457 and BFU2011-25384 to AA) and Junta de Andalucia (P11CTS-7187 ALP); FPI predoctoral fellowships from the Spanish ministry of Science and Innovation to IF-R and NM-T.es_ES
dc.publisherPublic Library of Science (PLOS)es_ES
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivs 3.0 Licensees_ES
dc.subjectChaperone proteinses_ES
dc.subjectFree energyes_ES
dc.subjectHomeostasis es_ES
dc.subjectProtein aggregationes_ES
dc.subjectProtein foldinges_ES
dc.subjectProtein interactionses_ES
dc.titleThe Role of Protein Denaturation Energetics and Molecular Chaperones in the Aggregation and Mistargeting of Mutants Causing Primary Hyperoxaluria Type Ies_ES

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