The homeodomain-leucine zipper ATHB23, a phytochrome B-interacting protein, is important for phytochrome B-mediated red light signaling
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- The homeodomain-leucine zipper ATHB23, a phytochrome B-interacting protein, is important for phytochrome B-mediated red light signaling
- Hyunmo Choi; Suyeong Jeong; Dong Su Kim; Hyung Jin Na; Jong Sang Ryu; Seung Sik Lee; Hong Gil Nam; Pyung Ok Lim; Hye Ryun Woo
- PHYSIOLOGIA PLANTARUM, v.150, no.2, pp.308 - 320
- Phytochromes are red (R)/far-red (FR) photoreceptors that are central to the
regulation of plant growth and development. Although it is well known
that photoactivated phytochromes are translocated into the nucleus where
they interact with a variety of nuclear proteins and ultimately regulate
genome-wide transcription, the mechanisms by which these photoreceptors
function are not completely understood. In an effort to enhance our
understanding of phytochrome-mediated light signaling networks, we
attempted to identify novel proteins interacting with phytochrome B (phyB).
Using affinity purification in Arabidopsis phyB overexpressor, coupled with
mass spectrometry analysis, 16 proteins that interact with phyB in vivo
were identified. Interactions between phyB and six putative phyB-interacting
proteins were confirmed by bimolecular fluorescence complementation
(BiFC) analysis. Involvement of these proteins in phyB-mediated signaling
pathways was also revealed by physiological analysis of the mutants defective
in each phyB-interacting protein.We further characterized the athb23 mutant
impaired in the homeobox protein 23 (ATHB23) gene. The athb23 mutant
displayed altered hypocotyl growth under R light, as well as defects in phyBdependent
seed germination and phyB-mediated cotyledon expansion. Taken
together, these results suggest that the ATHB23 transcription factor is a novel
component of the phyB-mediated R light signaling pathway.
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