Characterization and expression profiling of camellia sinensis cinnamate 4-hydroxylase genes
 
作者: 文章来源: 点击数: 更新日期:2017-08-08

Title


Characterization and expression profiling of camellia sinensis cinnamate 4-hydroxylase genes in phenylpropanoid pathways


Authors


Jinxin Xia†, Yajun Liu†, Shengbo Yao, Ming Li, Mengqing Zhu, Keyi Huang, Liping Gao*, Tao Xia*


Journal


Genes 2017, 8(8), 193; doi:10.3390/genes8080193


Abstract


Cinnamate 4-hydroxylase (C4H), a cytochrome P450-dependent monooxygenase, participates in the synthesis of numerous polyphenoid compounds, such as flavonoids and lignins. However, the
C4H gene number and function in tea plants are not clear. We screened all available transcriptome and genome databases of tea plants and three C4H genes were identified and named CsC4Ha, CsC4Hb, and CsC4Hc, respectively. Both CsC4Ha and CsC4Hb have 1518-bp open reading frames that encode 505-amino acid proteins. CsC4Hc has a 1635-bp open reading frame that encodes a 544-amino acid protein. Enzymatic analysis of recombinant proteins expressed in yeast showed that the three enzymes catalyzed the formation of p-coumaric acid (4-hydroxy trans-cinnamic acid) from trans-cinnamic acid. Quantitative real-time PCR (qRT-PCR) analysis showed that CsC4Ha was highly expressed in the 4th leaf, CsC4Hb was highly expressed in tender leaves, while CsC4Hc was highly expressed in the young stems. The three CsC4Hs were induced with varying degrees by abiotic stress treatments. These results suggest they may have different subcellular localization and different physiological functions.




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  • characterization and expression profiling of camellia sinensis(夏金鑫、刘亚军、高丽萍、夏涛,2017).pdf
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