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Endophytic bacteria as contributors to theanine production in Camellia sinensis.

著者 Sun J , Chang M , Li H , Zhang Z , Chen Q , Chen Y , Yao Y , Pan A , Shi C , Wang C , Zhao J , Wan X
J Agric Food Chem.2019 Sep 03 ; ():.
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Theanine is the most abundant non-protein amino acid in Camellia sinensis, but it is not known how tea plant accumulates such high levels of theanine. The endophyte isolated from in vitro grown plantlets of C. sinensis cultivars were identified as Luteibacter spp., showing strong biocatalytic activity for converting both glutamine and ethylamine to theanine. The theanine was secreted outside of the bacterial. Endophyte isolated from in vitro plantlets of Camellia oleifera cultivar were identified as Bacillus safensis, not converting glutamine and ethylamine to theanine. Enzymatic assays in vitro indicated that γ-glutamyl transpeptidases rCsEGGTs from the endophyte Luteibacter strains converted glutamine and ethylamine into theanine at higher rates than rCsGGTs from C. sinensis. This is the first report on theanine biosynthesis by an endophyte from C. sinensis, which provide a new pathway to explore the mechanism of theanine biosynthesis in C. sinensis and the interactions between endophyte and tea plants.
PMID: 31479251 [PubMed - as supplied by publisher]
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