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Arabidopsis RNA‐binding protein UBA2a relocalizes into nuclear speckles in response to abscisic acid
Author(s) -
Riera Marta,
Redko Yulia,
Leung Jeffrey
Publication year - 2006
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2006.06.064
Subject(s) - arabidopsis , vicia faba , arabidopsis thaliana , microbiology and biotechnology , phosphorylation , biology , rna , biochemistry , chemistry , gene , botany , mutant
The Arabidopsis thaliana RNA binding protein UBA2a is the closest homologue of the Vicia faba AKIP1 (56% identity). Like AKIP1, UBA2a is a constitutively‐expressed nuclear protein and in response to ABA it is also reorganized within the nucleus in “speckles” suggesting a possible role of this protein in the regulation of mRNA metabolism during ABA signaling. AKIP1 interacts with, and is phosphorylated by, the upstream ABA‐activated protein kinase AAPK. We have investigated if a pathway similar to that described in Vicia faba also exists in Arabidopsis . Our results showed that despite the resemblance between the corresponding Vicia and Arabidopsis proteins, it appears that the function of UBA2a is independent of OST1 phosphorylation.