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http://dx.doi.org/10.5352/JLS.2007.17.12.1729

Identification of Brassinosteroid-Related Protein, BAK1 from Nutrition Deficient Tomato Cultivated by Soilless Cultivation System  

Shin, Pyung-Gyun (Plant Nutrition Division, National Institute of Agricultural Science and Technology, RDA)
Chang, An-Cheol (Plant Nutrition Division, National Institute of Agricultural Science and Technology, RDA)
Hong, Sung-Chang (Plant Nutrition Division, National Institute of Agricultural Science and Technology, RDA)
Lee, Ki-Sang (Plant Nutrition Division, National Institute of Agricultural Science and Technology, RDA)
Publication Information
Journal of Life Science / v.17, no.12, 2007 , pp. 1729-1733 More about this Journal
Abstract
Brassinolide insensitive associated receptor kinase 1(BAK1) is a critical component that play an important roles in signaling of brassinosteroid biosynthesis. Brassinosteroid-deficient and -insensitive mutants showed the characteristic of dwarf symptom. The nutrient deficient tomato showing stunt phenomenon was selected from soiless cultivation system using modified Sonneveld hydroponic solution. Twenty eight protein spots showing different expression levels compared to the control were isolated from extracts of stunted tomato leaves by 2D PAGE analyses. Significantly down-regulated 6 protein spots out of 28 protein spots were analyzed and sequenced by MALDI-TOF mass spectrometry. The protein spot having pI=4.5 and MW=24 kDa was identified as a signal protein, BAK1, which is directly related to brassinosteroid biosynthesis. In addition, five other protein spots were identified as BCK1, cystein proteinase, sulfutase, peroxidase and zinc finger factor respectively, and they were also signal proteins related to brassinosteroid biosynthesis. Furthermore, amplification of 500bp of BAK1 mRNA by RT-PCR using a primer set of peptide matched regions was inhibited conpared to that of the wild type. The results sugested that the BAK1 might be regulated at the transcription level in response to nutrition applications.
Keywords
Hydroponic; proteomics; BAK1; brassinosteroid; RT-PCR;
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