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Metabolite trafficking enables membrane-impermeable-terpene secretion by yeast
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Metabolite trafficking enables membrane-impermeable-terpene secretion by yeast
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Journal Article
Metabolite trafficking enables membrane-impermeable-terpene secretion by yeast
2022
Overview
Metabolites are often unable to permeate cell membranes and are thus accumulated inside cells. We investigate whether engineered microbes can exclusively secrete intracellular metabolites because sustainable metabolite secretion holds a great potential for mass-production of high-value chemicals in an efficient and continuous manner. In this study, we demonstrate a synthetic pathway for a metabolite trafficking system that enables lipophilic terpene secretion by yeast cells. When metabolite-binding proteins are tagged with signal peptides, metabolite trafficking is highly achievable; loaded metabolites can be precisely delivered to a desired location within or outside the cell. As a proof of concept, we systematically couple a terpene-binding protein with an export signal peptide and subsequently demonstrate efficient, yet selective terpene secretion by yeast (~225 mg/L for squalene and ~1.6 mg/L for β-carotene). Other carrier proteins can also be readily fused with desired signal peptides, thereby tailoring different metabolite trafficking pathways in different microbes. To the best of our knowledge, this is the most efficient cognate pathway for metabolite secretion by microorganisms.
The engineering of metabolite secretion from microorganisms can lead to many applications in synthetic biology. In this article, the authors engineer a metabolite trafficking system for the secretion of medicinal terpenes.
