Phosphorylation of the zinc finger transcriptional regulator ZAT6 by MPK6 regulates Arabidopsis seed germination under salt and osmotic stress.
Biochem Biophys Res Commun
; 430(3): 1054-9, 2013 Jan 18.
Article
em En
| MEDLINE
| ID: mdl-23257164
ABSTRACT
C(2)H(2)-type zinc finger proteins (ZFPs) play diverse roles in plant response to abiotic stresses. ZAT6, an Arabidopsis C(2)H(2)-type ZFP, has been reported to regulate root development and nutrient stress responses. However, its roles in regulation of abiotic stress response are incompletely known. Here, we demonstrate that salt or osmotic stress triggers a strong increase in ZAT6 expression in leaves. Transgenic plants overexpressing ZAT6 showed improved seed germination under salt and osmotic stress. Intriguingly, ZAT6 interacts with a stress-responsive mitogen-activated protein kinase MPK6 in vitro and in planta. ZAT6 is phosphorylated by both recombinant and plant endogenous MPK6. Serine 8 and serine 223 in ZAT6 were identified as the sites phosphorylated by MPK6. In contrast to wild-type form of ZAT6, overexpression of phosphorylation mutant form did not display significantly enhanced salt and osmotic stress tolerance. Altogether, our results suggest that phosphorylation by MPK6 is required for the functional role of ZAT6 in seed germination under salt and osmotic stress.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Sementes
/
Fatores de Transcrição
/
Dedos de Zinco
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Arabidopsis
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Germinação
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Proteínas Quinases Ativadas por Mitógeno
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Proteínas de Arabidopsis
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Tolerância ao Sal
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Biochem Biophys Res Commun
Ano de publicação:
2013
Tipo de documento:
Article