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Cry1 and GPA1 signaling genetically interact in hook opening and anthocyanin synthesis in Arabidopsis

Por: Fox, A. R.
Colaborador(es): Soto, G. C | Jones, A. M | Casal, J. J | Muschietti, J. P | Mazzella, M. A.
ISSN: 0167-4412.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): ARABIDOPSIS THALIANA | CRY1 | GPA1 | HETEROTRIMERIC G-PROTEINS | SIGNAL TRANSDUCTION | ANTHOCYANIN | ARABIDOPSIS PROTEIN | CRY1 PROTEIN, ARABIDOPSIS | CRYPTOCHROME | GPA1 PROTEIN, ARABIDOPSIS | GUANINE NUCLEOTIDE BINDING PROTEIN ALPHA SUBUNIT | MESSENGER RNA | PLANT RNA | SUCROSE | ARABIDOPSIS | BIOLOGICAL MODEL | BIOSYNTHESIS | DRUG EFFECT | GENE EXPRESSION REGULATION | GENETICS | LIGHT | METABOLISM | MUTATION | PHENOTYPE | PHYSIOLOGY | PLANT GROWTH | PROTEIN BINDING | PROTEIN PROCESSING | RADIATION EXPOSURE | SEEDLING | ANTHOCYANINS | ARABIDOPSIS PROTEINS | CRYPTOCHROMES | GENE EXPRESSION REGULATION, PLANT | GTP-BINDING PROTEIN ALPHA SUBUNITS | HYPOCOTYL | MODELS, BIOLOGICAL | PROTEIN PROCESSING, POST-TRANSLATIONAL | RNA, MESSENGER | RNA, PLANT | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR. En: Plant Molecular Biology Vol. 80, no. 3 (2012) 315-324Resumen: While studying blue light-independent effects of cryptochrome 1 [cry1] photoreceptor, we observed premature opening of the hook in cry1 mutants grown in complete darkness, a phenotype that resembles the one described for the heterotrimeric G-protein alpha subunit [GPA1] null mutant gpa1. Both cry1 and gpa1 also showed reduced accumulation of anthocyanin under blue light. These convergent gpa1 and cry1 phenotypes required the presence of sucrose in the growth media and were not additive in the cry1gpa1 double mutant, suggesting context-dependent signaling convergence between cry1 and GPA1 signaling pathways. Both, gpa1 and cry1 mutants showed reduced GTP-binding activity. The cry1 mutant showed wild-type levels of GPA1 mRNA or GPA1 protein. However, an anti-transducin antibody [AS/7] typically used for plant G alpha proteins, recognized a 54 kDa band in the wild type but not in gpa1 and cry1 mutants. We propose a model where cry1-mediated post-translational modification of GPA1 alters its GTP-binding activity.
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While studying blue light-independent effects of cryptochrome 1 [cry1] photoreceptor, we observed premature opening of the hook in cry1 mutants grown in complete darkness, a phenotype that resembles the one described for the heterotrimeric G-protein alpha subunit [GPA1] null mutant gpa1. Both cry1 and gpa1 also showed reduced accumulation of anthocyanin under blue light. These convergent gpa1 and cry1 phenotypes required the presence of sucrose in the growth media and were not additive in the cry1gpa1 double mutant, suggesting context-dependent signaling convergence between cry1 and GPA1 signaling pathways. Both, gpa1 and cry1 mutants showed reduced GTP-binding activity. The cry1 mutant showed wild-type levels of GPA1 mRNA or GPA1 protein. However, an anti-transducin antibody [AS/7] typically used for plant G alpha proteins, recognized a 54 kDa band in the wild type but not in gpa1 and cry1 mutants. We propose a model where cry1-mediated post-translational modification of GPA1 alters its GTP-binding activity.

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