2.1.1.202 - 2.1.1.202 gene MJ0026, expression in Escherichia coli strain BL21-CodonPlus(DE3)-RIL 2.1.1.202 inserted in the expression vector pET28b, and the corresponding protein is hyperexpressed in Escherichia coli BL21(DE3) 2.1.1.202 recombinant expression of His6-tagged wild-type enzyme HNSun6 and mutant enzymes 2.1.1.202 trm4a and trm4b, phylogenetic analysis