A growth regulatory loop that provides homeostasis to phytochrome a signaling.

Détails

ID Serval
serval:BIB_819A388E1A06
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
A growth regulatory loop that provides homeostasis to phytochrome a signaling.
Périodique
Plant Cell
Auteur⸱e⸱s
Lariguet P., Boccalandro H.E., Alonso J.M., Ecker J.R., Chory J., Casal J.J., Fankhauser C.
ISSN
1040-4651
Statut éditorial
Publié
Date de publication
12/2003
Peer-reviewed
Oui
Volume
15
Numéro
12
Pages
2966-2978
Langue
anglais
Résumé
Phytochrome kinase substrate1 (PKS1) is a cytoplasmic protein that interacts physically with, and is phosphorylated by, the plant photoreceptor phytochrome. Here, we show that light transiently increases PKS1 mRNA levels and concentrates its expression to the elongation zone of the hypocotyl and root. This response is mediated by phytochrome A (phyA) acting in the very low fluence response (VLFR) mode. In the hypocotyl, PKS1 RNA and protein accumulation are maintained only under prolonged incubation in far-red light, the wavelength that most effectively activates phyA. Null mutants of PKS1 and its closest homolog, PKS2, show enhanced phyA-mediated VLFR. Notably, a pks1 pks2 double mutant has no phenotype, whereas overexpression of either PKS1 or PKS2 results in the same phenotype as the pks1 or pks2 single null mutant. We propose that PKS1 and PKS2 are involved in a growth regulatory loop that provides homeostasis to phyA signaling in the VLFR. In accordance with this idea, PKS1 effects are larger in the pks2 background (and vice versa). Moreover, the two proteins can interact with each other, and PKS2 negatively regulates PKS1 protein levels specifically under VLFR conditions.
Mots-clé
Arabidopsis, Arabidopsis Proteins, Carrier Proteins, Gene Expression Regulation, Developmental, Gene Expression Regulation, Plant, Glucuronidase, Homeostasis, Hypocotyl, Intracellular Signaling Peptides and Proteins, Light, Mutation, Phenotype, Phosphoproteins, Phytochrome, Phytochrome A, Plant Proteins, Plant Roots, Plant Shoots, Protein Interaction Mapping, RNA, Messenger, Signal Transduction
Pubmed
Web of science
Open Access
Oui
Création de la notice
24/01/2008 15:29
Dernière modification de la notice
20/08/2019 14:41
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