my20 gene (GenBank accession no. MW561626) originated from the metagenome sequencing of marine microorganisms in the Mariana Trench. The gene my20 was codon optimized, synthesized, and cloned into pET-24a(+) by Genewiz (Wuhan, China). Escherichia coli BL21(DE3) was used for heterologous expression. Luria–Bertani (LB) medium was used to cultivate E. coli strains. AA-2G was obtained from DB (Shanghai, China). Ni2+-NTA HP resin was purchased from General Electric Company (United States). Other reagents were obtained from Shanghai Sinopharm Co., Ltd. (Shanghai, China).
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