Biosynthetic Insights into p-Hydroxybenzoic Acid-Derived Benzopyrans in Piper gaudichaudianum

Journal of the Brazilian Chemical Society

Batista, Andrea N. L.¹  Batista Jr., João M.²  Souza-Moreira, Tatiana M.³ 

[1] Universidade Estadual Paulista, Araraquara, Brazil;Universidade Federal de São Carlos, São Carlos, Brazil;Universidade de São Paulo, São Paulo, Brazil

关键词: Piperaceae;    chromene;    transcriptome;    RNA-seq;    de novo assembly;    biosynthesis.;   

DOI  :  10.21577/0103-5053.20170238

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

Piper gaudichaudianum Kunth (Piperaceae) accumulates gaudichaudianic acid, a prenylated benzopyran, as its major component. Interestingly, this trypanocidal compound occurs as a racemic mixture. Herein, transcriptomic investigations of Piper gaudichaudianum using the RNA-seq approach are reported, and from the analysis of the transcripts expressed it was possible to propose a complete biosynthetic pathway for the production of gaudichaudianic acid, including the steps that originate its precursor, p-hydroxybenzoic acid. Peperomia obtusifolia (L.) A. Dietr. (Piperaceae) also accumulates racemic benzopyrans, however, its chromanes originate from the polyketide pathway, while the chromenes from Piper derives from the shikimate pathway. Recent transcriptomic and proteomic studies of the former species did not identify polyketide synthases involved in the production of the benzopyran moiety, but revealed the expression of tocopherol cyclase, which may be responsible for the cyclization of the 3,4-dihydro-2H-pyran ring. The analysis of the enzymes involved in the secondary metabolism of Piper gaudichaudianum and the comparison with the data previously obtained from Peperomia obtusifolia can provide valuable information on how these compounds are biosynthesized.

【 授权许可】

CC BY