Uridine diphosphate rhamnose(UDP-Rha), a glycoside donor synthesized with the catalysis of rhamnose synthase(RHM), is one of the important elements in the synthesis of rhamnosides. In this study, we cloned a RHM gene from Citrus sinensis(CsRHM) and analyzed its bioinformatic information and functions in vitro. The results showed the gene consisted of an open reading frame of 2 007 bp encoding 668 amino acid residues. The deduced protein had a presumed molecular weight of 75.27 kDa, a theoretical isoelectric point of 6.97, and the characteristic signal sequences(GxxxGxxG/A and YxxxK) of the RHM family. Multiple sequence alignments and the phylogenetic tree demonstrated that CsRHM shared homology with other RHMs. The results of enzymatic reactions in vitro showed that the recombinant protein CsRHM catalyzed the conversion of UDP-Glu to UDP-Rha, with the kinetic parameters V_(max), K_m, K_(cat), and K_(cat)/K_m of 0.373 7 μmol·L~(-1)·min~(-1), 21.29 μmol·L~(-1), 0.24 s~(-1), and 1.13×10~4 s~(-1)·L·mol~(-1), respectively. This study is the first report about CsRHM with validated catalytic function in vitro, which provides a foundation for further research on the biosynthesis of UDP-Rha.
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