Characterisation and Expression Analysis of Hydroxyphenylpyruvate Reductase derived from Orthosiphon aristatus
Abstract
Herbal products are getting more popular as alternative medicines and food supplements. The therapeutic effects of herbal medicines are mainly attributed to their bioactive secondary metabolites. Orthosiphon aristatus, locally known as ‘Misai Kucing’, is known for its various health benefits. One of the main chemical constituent of O. aristatus is rosmarinic acid, a plant polyphenol that has been proven to have antioxidant, anti-inflammatory and antimicrobial activities. Hydroxyphenylpyruvate reductase (HPPR) is one of the enzymes involved in rosmarinic acid biosynthetic pathway. Here we report the effect of UV on HPPR expression and the isolation of a full-length hppr cDNA from O. aristatus via rapid amplification of cDNA ends polymerase chain reaction. An increase in the expression was detected when the plant was exposed to UV and detected via the expression of hppr transcript. A 1116 bp nucleotide putative cDNA was isolated corresponding to 307 predicted amino acid. We have also isolated the 5’ and 3’ untranslated regions with a length of 54 bp and 123 bp, respectively. Sequence similarity analysis was performed against NCBI genebank and the BLAST result showed that the putative hppr cDNA isolated from O. aristatus exhibited high similarities with other hppr cDNA of the members of the Lamiaceae family such as Perilla frutescens, Salvia officinalis, Salvia miltiorrhiza and Solenostemon scutellarioides.References
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