4.1.1.98 expressed in Escherichia coli 728858 4.1.1.98 expressed in Escherichia coli BL21(DE3) cells 728916, 730732, 730891 4.1.1.98 expressed in Escherichia coli ubiX and ubiD deletion mutant 727983 4.1.1.98 expression in Escherichia coli 748226 4.1.1.98 gene ubiX, recombinant expression of His6-tagged wild-type and mutant enzymes in Escherichia coli strain BL21(DE3) 746643