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KMID : 0578320070230020161
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Molecules and Cells
2007 Volume.23 No. 2 p.161 ~ p.169
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Molecular and Functional Characterization of Monocot-specific Pex5p Splicing Variants, Using OsPex5pL and OsPex5pS from Rice (Oryza sativa)
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Lee Jung-Ro
Jung Ji-Hyun
Kang Jae-Sook
Kim Jong-Cheol
Jung In-Jung
Seok Min-Sook
Kim Ji-Hye
Kim Woe-Yeon
Kim Min-Gab
Kim Jae-Yean
Lim Chae-Oh
Lee Kyun-Oh
Lee Sang-Yeol
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Abstract
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We identified two alternatively spliced variants of the peroxisomal targeting signal 1 (PTS1) receptor protein Pex5ps in monocot (rice, wheat, and barley) but not in dicot (Arabidopsis and tobacco) plants. We characterized the molecular and functional differences between the rice (Oryza sativa) Pex5 splicing variants OsPex5pL and OsPex5pS. There is only a single-copy of OsPEX5 in the rice genome and RT-PCR analysis points to alternative splicing of the transcripts. Putative light-responsive cis-elements were identified in the 5? region flanking OsPEX5L and Northern blot analysis demonstrated that this region affected light-dependent expression of OsPEX5 transcription. Using the pex5-deficient yeast mutant Scpex5, we showed that OsPex5pL and OsPex5pS are able to restore translocation of a model PTS1 protein (GFP-SKL) into peroxisomes. OsPex5pL and OsPex5pS formed homo-complexes via specific interaction domains, and interacted with each other and OsPex14p to form hetero-complexes. Although overexpression of OsPex5pL in the Arabidopsis pex5 mutant (Atpex5) rescued the mutant phenotype, overexpression of OsPex5pS only resulted in partial recovery.
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KEYWORD
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β-Oxidation, Alternatively Spliced Variants, Dicot, Light-dependent Expression, Monocot, OsPex5pL, OsPex5pS, Peroxisomal Targeting Signal 1 (PTS1)
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