Abstract
Caffeine (Cf) is one of the important components of plant-derived drinks, such as tea, coffee, and cola. It can protect soft tissues from being infected by pathogens and is also medically beneficial for human health. In this review, we first introduced the Cf biosynthesis pathways in plants and the related N-methyltransferases (NMTs), with a focus on the current research status of the substrate specificity, structural basis for substrate recognition, and catalytic mechanism in members of the caffeine synthase gene family. In addition, we addressed the expression characteristics and potential regulatory mechanisms of NMTs and also projected the future research directions. The goal was to summarize the Cf biosynthetic pathway and related NMTs in plants and to provide the molecular basis for regulating the caffeine biosynthesis, so as to effectively guide future tea and coffee breeding.
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