Plant Glutathione Peroxidases Are Functional Peroxiredoxins Distributed in Several Subcellular Compartments and Regulated during Biotic and Abiotic Stresses1[W] (Record no. 42788)

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control field 20250625124721.0
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Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) B-8484
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Title Plant Glutathione Peroxidases Are Functional Peroxiredoxins Distributed in Several Subcellular Compartments and Regulated during Biotic and Abiotic Stresses1[W]
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Volume/sequential designation Plant Physiology, 142(4), p.1364-1379, 2006
520 3# - SUMMARY, ETC.
Summary, etc. We provide here an exhaustive overview of the glutathione (GSH)peroxidase (Gpx)family of poplar (Populus trichocarpa). Although these proteins were initially defined as GSH dependent, in fact they use only reduced thioredoxin (Trx)for their regeneration and do not react with GSH or glutaredoxin, constituting a fifth class of peroxiredoxins. The two chloroplastic Gpxs display a marked selectivity toward their electron donors, being exclusively specific for Trxs of the y type for their reduction. In contrast, poplar Gpxs are much less specific with regard to their electron-accepting substrates, reducing hydrogen peroxide and more complex hydroperoxides equally well. Site-directed mutagenesis indicates that the catalytic mechanism and the Trx-mediated recycling process involve only two (cysteine [Cys]-107 and Cys-155)of the three conserved Cys, which form a disulfide bridge with an oxidation-redox midpoint potential of 2295 mV. The reduction/formation of this disulfide is detected both by a shift on sodium dodecyl sulfate-polyacrylamide gel electrophoresis or by measuring the intrinsic tryptophan fluorescence of the protein. The six genes identified coding for Gpxs are expressed in various poplar organs, and two of them are localized in the chloroplast, with one olocalizing in mitochondria, suggesting a broad distribution of Gpxs in plant cells. The abundance of some Gpxs is modified in plants subjected to nvironmental constraints, generally increasing during fungal infection, water deficit, and metal stress, and decreasing during photooxidative stress, showing that Gpx proteins are involved in the response to both biotic and abiotic stress conditions.
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Personal name Navrot, N.
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Personal name Collin, V.
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Personal name Gualberto, J.
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Personal name Gelhaye, E.
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Personal name Hirasawa, M.
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Personal name Rey, P.
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Personal name Knaff, D.B.
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Personal name Knaff, D.B.
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Personal name Jacquot, J.P.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Rouhier, N.
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Uniform Resource Identifier <a href="https://drive.google.com/file/d/1270i3q4Vn8Z-vMtvj1KttIeiSX9UgbR8/view?usp=drivesdk">https://drive.google.com/file/d/1270i3q4Vn8Z-vMtvj1KttIeiSX9UgbR8/view?usp=drivesdk</a>
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Source of classification or shelving scheme Clasificación local
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  Clasificación local     Ref1 CICY CICY Documento préstamo interbibliotecario 25.06.2025   B-8484 25.06.2025 25.06.2025 Documentos solicitados