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Korean Society for Biochemistry and Molecular Biology (생화학분자생물학회)
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Alternative splicing and expression analysis of High expression of osmotically responsive genes1 (HOS1) in Arabidopsis

  • Lee, Jeong-Hwan (Creative Research Initiatives, Division of Life Sciences, Korea University) ;
  • Kim, Soo-Hyun (Creative Research Initiatives, Division of Life Sciences, Korea University) ;
  • Kim, Jae-Joon (Creative Research Initiatives, Division of Life Sciences, Korea University) ;
  • Ahn, Ji-Hoon (Creative Research Initiatives, Division of Life Sciences, Korea University)
  • Received : 2012.04.26
  • Accepted : 2012.06.04
  • Published : 2012.09.30
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Abstract

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 identified HOS1 (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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References

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