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  • Title: Involvement of Three CsRHM Genes from Camellia sinensis in UDP-Rhamnose Biosynthesis.
    Author: Dai X, Zhao G, Jiao T, Wu Y, Li X, Zhou K, Gao L, Xia T.
    Journal: J Agric Food Chem; 2018 Jul 11; 66(27):7139-7149. PubMed ID: 29916708.
    Abstract:
    UDP-Rhamnose synthase (RHM), the branch-point enzyme controlling the nucleotide sugar interconversion pathway, converts UDP-d-glucose into UDP-rhamnose. As a rhamnose residue donor, UDP-l-rhamnose is essential for the biosynthesis of pectic polysaccharides and secondary metabolites in plants. In this study, three CsRHM genes from tea plants ( Camellia sinensis) were cloned and characterized. Enzyme assays showed that three recombinant proteins displayed RHM activity and were involved in the biosynthesis of UDP-rhamnose in vitro. The transcript profiles, metabolite profiles, and mucilage location suggest that the three CsRHM genes likely contribute to UDP-rhamnose biosynthesis and may be involved in primary wall formation in C. sinensis. These analyses of CsRHM genes and metabolite profiles provide a comprehensive understanding of secondary metabolite biosynthesis and regulation in tea plants. Moreover, our results can be applied for the synthesis of the secondary metabolite rhamnoside in future studies.
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