Les séminaires ont lieu sur le Campus Montpellier SupAgro/INRA de La Gaillarde (2, place P. Viala Montpellier)
Jeudi 14 janvier 2010
Amphi 208 (Cœur d’Ecole) à 14h
Mécanismes de régulation des protéines kinases SnRK2 d’Arabidopsis dans la signalisation osmotique
ISV, Gif s Yvette
Snf1-related protein kinases 2 (SnRK2s) are identified as major positive regulators of drought stress tolerance. The kinases of this family are activated by hyperosmotic stress, but only some of them are also responsive to abscisic acid (ABA). Genetic evidences indicated the ABA-independence of SnRK2 activation in the fast response to osmotic stress. Phosphorylation is necessary for the activation of the kinases of both subgroups and two phosphorylated serine residues within the activation loop have crucial and distinct roles. Moreover, different phosphorylation mechanisms are demonstrated using one kinase of each subgroup (SnRK2.6 and SnRK2.10). In particular, a subgroup of protein phosphatases 2C which interact and participate in the regulation of SnRK2.6 do not interact with SnRK2.10.
Contact : Véronique Santoni