AtUTr1, a UDP-glucose/UDP-galactose transporter from Arabidopsis thaliana, is located in the endoplasmic reticulum and up-regulated by the unfolded protein response

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dc.contributor.authorReyes, F.
dc.contributor.authorMarchant, L.
dc.contributor.authorNorambuena, L.
dc.contributor.authorNilo, R.
dc.contributor.authorSilva, H.
dc.contributor.authorOrellana, A.
dc.date.accessioned2021-07-06T19:10:41Z
dc.date.available2021-07-06T19:10:41Z
dc.date.issued2006-04
dc.descriptionIndexación: Scopus.es
dc.description.abstractThe folding of glycoproteins in the endoplasmic reticulum (ER) depends on a quality control mechanism mediated by the calnexin/calreticulin cycle. During this process, continuous glucose trimming and UDP-glucose-dependent re-glucosylation of unfolded glycoproteins takes place. To ensure proper folding, increases in misfolded proteins lead to up-regulation of the components involved in quality control through a process known as the unfolded protein response (UPR). Reglucosylation is catalyzed by the ER lumenal located enzyme UDP-glucose glycoprotein glucosyltransferase, but as UDP-glucose is synthesized in the cytosol, a UDP-glucose transporter is required in the calnexin/calreticulin cycle. Even though such a transporter has been hypothesized, no protein playing this role in the ER yet has been identified. Here we provide evidence that AtUTr1, a UDP-galactose/glucose transporter from Arabidopsis thaliana, responds to stimuli that trigger the UPR increasing its expression around 9-fold. The accumulation of AtUTr1 transcript is accompanied by an increase in the level of the AtUTr1 protein. Moreover, subcellular localization studies indicate that AtUTr1 is localized in the ER of plant cells. We reasoned that an impairment in AtUTr1 expression should perturb the calnexin/calreticulin cycle leading to an increase in misfolded protein and triggering the UPR. Toward that end, we analyzed an AtUTr1 insertional mutant and found an up-regulation of the ER chaperones BiP and calnexin, suggesting that these plants may be constitutively activating the UPR. Thus, we propose that in A. thaliana, AtUTr1 is the UDP-glucose transporter involved in quality control in the ER.es
dc.description.urihttps://www.jbc.org/article/S0021-9258(19)56445-6/fulltext
dc.identifier.citationJournal of Biological Chemistry, Volume 281, Issue 14, Pages 9145 - 9151, 7 April 2006es
dc.identifier.doiDOI: 10.1074/jbc.M512210200
dc.identifier.issn1083-351X
dc.identifier.urihttp://repositorio.unab.cl/xmlui/handle/ria/19278
dc.language.isoenes
dc.publisherAmerican Society for Biochemistry and Molecular Biology [Associate Organisation] Elsevier [Commercial Publisher]es
dc.subjectMannosyltransferaseses
dc.subjectMannoproteinses
dc.subjectGDP-mannose Transporteres
dc.subjectCatalyst activityes
dc.subjectEnzyme kineticses
dc.subjectArabidopsises
dc.subjectArabidopsis Proteinses
dc.subjectEndoplasmic Reticulumes
dc.subjectGene Expression Profilinges
dc.titleAtUTr1, a UDP-glucose/UDP-galactose transporter from Arabidopsis thaliana, is located in the endoplasmic reticulum and up-regulated by the unfolded protein responsees
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