Characterization of pollen-expressed bZIP protein interactions and the role of ATbZIP18 in the male gametophyte

0476392 - ÚEB 2018 RIV DE eng J - Journal Article
Gibalová, Antónia - Steinbachová, Lenka - Hafidh, Said - Bláhová, Veronika - Gadiou, Zuzana - Michailidis, Christos - Müller, Karel - Pleskot, Roman - Dupľáková, Nikoleta - Honys, David
Characterization of pollen-expressed bZIP protein interactions and the role of ATbZIP18 in the male gametophyte.
Plant Reproduction. Roč. 30, č. 1 (2017), s. 1-17. ISSN 2194-7953. E-ISSN 2194-7961
R&D Projects: GA ČR GA15-22720S; GA ČR(CZ) GA14-32292S; GA ČR GP13-41444P; GA MŠMT(CZ) LD14109
Institutional support: RVO:61389030
Keywords : reticulum stress-response * transcription factor * arabidopsis-thaliana * molecular-interactions * plant transformation * gene-expression * heterodimerization * dimerization * evolution * specificity * bZIP * Transcription factors * Regulatory network * Male gametophyte * y2h * Pollen development
OECD category: Plant sciences, botany
Impact factor: 2.707, year: 2017

Transcriptional control of gene expression represents an important mechanism guiding organisms through developmental processes and providing plasticity towards environmental stimuli. Because of their sessile nature, plants require effective gene regulation for rapid response to variation in environmental and developmental conditions. Transcription factors (TFs) provide such control ensuring correct gene expression in spatial and temporal manner. Our work reports the interaction network of six bZIP TFs expressed in Arabidopsis thaliana pollen and highlights the potential functional role for AtbZIP18 in pollen. AtbZIP18 was shown to interact with three other pollen-expressed bZIP TFs-AtbZIP34, AtbZIP52, and AtbZIP61 in yeast two-hybrid assays. AtbZIP18 transcripts are highly expressed in pollen, and at the subcellular level, an AtbZIP18-GFP fusion protein was located in the nucleus and cytoplasm/ER. To address the role of AtbZIP18 in the male gametophyte, we performed phenotypic analysis of a T-DNA knockout allele, which showed slightly reduced transmission through the male gametophyte. Some of the phenotype defects in atbzip18 pollen, although observed at low penetrance, were similar to those seen at higher frequency in the T-DNA knockout of the interacting partner, AtbZIP34. To gain deeper insight into the regulatory role of AtbZIP18, we analysed atbzip18/- pollen microarray data. Our results point towards a potential repressive role for AtbZIP18 and its functional redundancy with AtbZIP34 in pollen.
Permanent Link: http://hdl.handle.net/11104/0272902