The Arabidopsis plastidial thioredoxins. New functions and new insights into specificity

dc.creatorCollin, Valérie
dc.creatorIssakidis-Bourguet, Emmanuelle
dc.creatorMarchand, Christophe
dc.creatorHirasawa, Masakazu (TTU)
dc.creatorLancelin, Jean Marc
dc.creatorKnaff, David B. (TTU)
dc.creatorMiginiac-Maslow, Myroslawa
dc.date.accessioned2023-09-01T16:40:33Z
dc.date.available2023-09-01T16:40:33Z
dc.date.issued2003
dc.descriptioncc-by
dc.description.abstractThe sequencing of the genome of Arabidopsis thaliana revealed that this plant contained numerous isoforms of thioredoxin (Trx), a protein involved in thiol-disulfide exchanges. On the basis of sequence comparison, seven putative chloroplastic Trxs have been identified, four belonging to the m-type, two belonging to the f-type, and one belonging to a new x-type. In the present work, these isoforms were produced and purified as recombinant proteins without their putative transit peptides. Their activities were tested with two known chloroplast thioredoxin targets: NADP-malate dehydrogenase and fructose-1,6-bisphosphatase and also with a chloroplastic 2-Cys peroxiredoxin. The study confirms the strict specificity of fructose-bisphosphatase for Trx f, reveals that some Trxs are unable to activate NADP-malate dehydrogenase, and shows that the new x-type is the most efficient substrate for peroxiredoxin while being inactive toward the two other targets. This suggests that this isoform might be specifically involved in resistance against oxidative stress. Three-dimensional modeling shows that one of the m-type Trxs, Trx m3, which has no activity with any of the three targets, exhibits a negatively charged surface surrounding the active site. A green fluorescent protein approach confirms the plastidial localization of these Trxs.
dc.identifier.citationCollin, V., Issakidis-Bourguet, E., Marchand, C., Hirasawa, M., Lancelin, J.-M., Knaff, D.B., & Miginiac-Maslow, M.. 2003. The Arabidopsis plastidial thioredoxins. New functions and new insights into specificity. Journal of Biological Chemistry, 278(26). https://doi.org/10.1074/jbc.M302077200
dc.identifier.urihttps://doi.org/10.1074/jbc.M302077200
dc.identifier.urihttps://hdl.handle.net/2346/95957
dc.language.isoeng
dc.titleThe Arabidopsis plastidial thioredoxins. New functions and new insights into specificity
dc.typeArticle

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