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. 2020 Apr 14;10:6286. doi: 10.1038/s41598-020-62859-2

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Purine alkaloid metabolic pathway. Dotted line indicates that some metabolites have been omitted. The column chart shown that the gene expression of three tea samples. The red genes play a synthetic role and the blue represent degradation. *SAMS, S-adenosylmethionine synthetase, APRT, adenine phosphoribosyltransferase; NK, nucleoside kinase; 5′-NT, 5′-nucleotidase; 3-NMT and 1-NMT, tea caffeine synthase (TCS); N-MeNase, N-methyl nucleosidase; CYP1A2, cytochrome P450 family 1 subfamily apolypeptide 2; ALN, allantoinase; URE, urease.