title: Protein phosphatase 2A regulatory subunits affecting plant innate immunity, energy metabolism, and flowering time--joint functions among B'η subfamily members.
abstract: Protein phosphatase 2A (PP2A) is a heterotrimeric complex comprising a catalytic, scaffolding, and regulatory subunit. The regulatory subunits are essential for substrate specificity and localization of the complex and are classified into B/B55, B', and B" non-related families in higher plants. In Arabidopsis thaliana, the close paralogs B'η, B'θ, B'γ, and B'ζ were further classified into a subfamily of B' called B'η. Here we present results that consolidate the evidence for a role of the B'η subfamily in regulation of innate immunity, energy metabolism and flowering time. Proliferation of the virulent Pseudomonas syringae in B'θ knockout mutant decreased in comparison with wild type plants. Additionally, B'θ knockout plants were delayed in flowering, and this phenotype was supported by high expression of FLC (FLOWERING LOCUS C). B'ζ knockout seedlings showed growth retardation on sucrose-free medium, indicating a role for B'ζ in energy metabolism. This work provides insight into functions of the B'η subfamily members, highlighting their regulation of shared physiological traits while localizing to distinct cellular compartments.
authors.affiliation: a University of Stavanger; Center for Organelle Research; Faculty of Science and Technology ; Stavanger , Norway.
authors.forename: Amr R A
authors.initials: AR
authors.lastname: Kataya
authors.forename: Behzad
authors.initials: B
authors.lastname: Heidari
authors.forename: Cathrine
authors.initials: C
authors.lastname: Lillo
mesh_terms: D017360:Arabidopsis / Q000201:enzymology* / Q000235:genetics / Q000276:immunology; D029681:Arabidopsis Proteins / Q000378:metabolism; D004734:Energy Metabolism; D035264:Flowers / Q000502:physiology*; D007113:Immunity, Innate; D026161:MADS Domain Proteins / Q000378:metabolism; D057865:Plant Immunity; D054648:Protein Phosphatase 2 / Q000378:metabolism*
chemical_list: D029681:Arabidopsis Proteins; C418902:At5g10140 protein, Arabidopsis; D026161:MADS Domain Proteins; D054648:Protein Phosphatase 2
keywords: Arabidopsis thaliana; PP2A; flowering time; mitochondria; peroxisomes; protein phosphatase; β-oxidation