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KMID : 0624620120450090515
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BMB Reports
2012 Volume.45 No. 9 p.515 ~ p.520
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Alternative splicing and expression analysis of High expression of osmotically responsive genes1 (HOS1) in Arabidopsis
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Lee Jeong-Hwan
Kim Soo-Hyun
Kim Jae-Joon
Ahn Ji-Hoon
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Abstract
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High expression of osmotically responsive genes1 (HOS1), a key regulator of low temperature response and flowering time, encodes an E3 ubiquitin ligase in Arabidopsis. Here, we report characterization of a newly identified splice variant (HOS1-L) of HOS1. Comparative analyses revealed that HOS1-L has a longer 5' nucleotide sequence than that of the previously identifiedHOS1 (HOS1-S) and that its protein sequence was more conserved than that of HOS1-S in plants. HOS1-L transcripts were spatio-temporally more abundant than those of HOS1-S. The recovery rate of HOS1-S expression was faster than that of HOS1-L after cold treatment. Diurnal oscillation patterns of HOS1-L revealed that HOS1-L expression was affected by photoperiod. An in vitro pull-down assay revealed that the HOS1-L protein interacted with the ICE1 protein. HOS1-L overexpression caused delayed flowering in wild-type plants. Collectively, these results suggest regulation of HOS1 expression at the post-transcriptional level.
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KEYWORD
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AAB87130, Alternative splicing, BT005517, HOS1, Posttranscriptional regulation
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