Withanolide Biosynthesis Recruits Both Mevalonate and DOXP Pathways of Isoprenogenesis in Ashwagandha Withania Somnifera L. (Dunal)

Overview

Journal Plant Cell Rep

Publisher Springer

Date 2012 Jun 27

PMID 22733207

Citations 42

Authors

Narayan D Chaurasiya

Neelam S Sangwan

Farzana Sabir

Laxminarain Misra

Rajender S Sangwan

Affiliations

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Abstract

Withanolides are pharmaceutically important C(28)-phytochemicals produced in most prodigal amounts and diversified forms by Withania somnifera. Metabolic origin of withanolides from triterpenoid pathway intermediates implies that isoprenogenesis could significantly govern withanolide production. In plants, isoprenogenesis occurs via two routes: mevalonate (MVA) pathway in cytosol and non-mevalonate or DOXP/MEP pathway in plastids. We have investigated relative carbon contribution of MVA and DOXP pathways to withanolide biosynthesis in W. somnifera. The quantitative NMR-based biosynthetic study involved tracing of (13)C label from (13)C(1)-D-glucose to withaferin A in withanolide producing in vitro microshoot cultures of the plant. Enrichment of (13)C abundance at each carbon of withaferin A from (13)C(1)-glucose-fed cultures was monitored by normalization and integration of NMR signal intensities. The pattern of carbon position-specific (13)C enrichment of withaferin A was analyzed by a retro-biosynthetic approach using a squalene-intermediated metabolic model of withanolide (withaferin A) biosynthesis. The pattern suggested that both DOXP and MVA pathways of isoprenogenesis were significantly involved in withanolide biosynthesis with their relative contribution on the ratio of 25:75, respectively. The results have been discussed in a new conceptual line of biosynthetic load-driven model of relative recruitment of DOXP and MVA pathways for biosynthesis of isoprenoids. Key message The study elucidates significant contribution of DOXP pathway to withanolide biosynthesis. A new connotation of biosynthetic load-based role of DOXP/MVA recruitment in isoprenoid biosynthesis has been proposed.

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