secondary-metabolites
Secondary metabolites are organic compounds produced by plants that are not directly required for basic growth or reproduction, but instead serve specialized ecological roles such as defense against herbivores and pathogens, attraction of pollinators, and competition with neighboring plants. Understanding these compounds is central to plant biology research because they represent the chemical language through which plants interact with their environment. Beyond their ecological significance, secondary metabolites are also a rich source of pharmaceuticals, dyes, and agrochemicals, making their biosynthesis and regulation a major focus of plant science.
open_in_new WikipediaPubMed · 2026-04-06
Scientists identified a molecular pump protein in red sage (a medicinal herb) that moves the plant's potent healing compounds — called tanshinones — across cell walls and out of cells. This discovery reveals, for the first time, a key mechanism by which red sage transports its medicinal molecules, opening the door to producing more of these compounds for medicine.
SmABCG24 is a half-size ABC transporter protein found on the outer membrane of red sage cells, making it the first characterized tanshinone transporter in this species.
Yeast cells engineered to express SmABCG24 efficiently exported tanshinone IIA and showed significantly reduced cytotoxicity from the compound, confirming active export function.
Transport activity depended on both ATP hydrolysis and the proton gradient, as blocking either process inhibited tanshinone export, revealing a dual-energy requirement.
