This cluster of papers focuses on the biosynthesis and engineering of terpenoids, including the isoprenoid pathway, metabolic engineering for plant volatile production, sesquiterpene and triterpene biosynthesis, MEP pathway optimization, cyclization enzymes, and the production of specific terpenoids like artemisinin. The research spans across various organisms and aims to understand, manipulate, and optimize the biosynthetic pathways for the production of valuable terpenoid compounds.