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Artículo

Arabidopsis SCO Proteins Oppositely Influence Cytochrome c Oxidase Levels and Gene Expression during Salinity Stress

Mansilla, NatanaelIcon ; Welchen, ElinaIcon ; Gonzalez, Daniel HectorIcon
Fecha de publicación: 08/2019
Editorial: Oxford University Press
Revista: Plant And Cell Physiology
ISSN: 0032-0781
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Bioquímica y Biología Molecular

Resumen

SCO proteins are involved in the insertion of copper during the assembly of cytochrome c oxidase (COX), the final enzyme of the mitochondrial respiratory chain. Two SCO proteins, named HCC1 and HCC2, are present in seed plants, but HCC2 lacks the residues involved in copper binding, leading to uncertainties about its function. In this work, we performed a transcriptomic and phenotypic analysis of Arabidopsis thaliana plants with reduced expression of HCC1 or HCC2. We observed that a deficiency in HCC1 causes a decrease in the expression of several stress-responsive genes, both under basal growth conditions and after applying a short-term high salinity treatment. In addition, HCC1 deficient plants show a faster decrease in chlorophyll content, photosystem II quantum efficiency, and COX levels after salinity stress, as well as a faster increase in alternative oxidase capacity. Notably, HCC2 deficiency causes opposite changes in most of these parameters. Bimolecular fluorescence complementation analysis indicated that both proteins are able to interact. We postulate that HCC1 is a limiting factor for COX assembly during high salinity conditions and that HCC2 probably acts as a negative modulator of HCC1 activity through protein-protein interactions. In addition, a direct or indirect role of HCC1 and HCC2 in the gene expression response to stress is proposed.
Palabras clave: SCO PROTEIN , MITOCHONDRIA , SALINITY , ARABIDOPSIS THALIANA
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/118757
URL: https://www.ncbi.nlm.nih.gov/pubmed/31418792
DOI: http://dx.doi.org/10.1093/pcp/pcz166
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Articulos de INSTITUTO DE AGROBIOTECNOLOGIA DEL LITORAL
Citación
Mansilla, Natanael; Welchen, Elina; Gonzalez, Daniel Hector; Arabidopsis SCO Proteins Oppositely Influence Cytochrome c Oxidase Levels and Gene Expression during Salinity Stress; Oxford University Press; Plant And Cell Physiology; 60; 12; 8-2019; 2769-2784
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