反应详情

To test the activity of the XR/Lad1/Alx1 operon, plasmid pATX112 was inserted into strain ZUC99 by electroporation (ZUC99/pATX112). The strain was inoculated from a single colony into 3 mL LB media supplemented with ampicillin (200 mg/L) and incubated overnight at 30° C. with shaking (250 RPM). After incubation, an aliquot of the culture was diluted 100-fold into 20 mL of fresh LB media contain L-arabinose (1% w/v) and ampicillin (200 mg/L) and incubated (30° C., 250 RPM) for 2 hrs. The culture was induced with isopropyl-β-D-thiogalactopyranoside (IPTG, 1 mM). The culture was incubated at 30° C. with shaking (250 RPM) and aliquots were removed at various time points after the IPTG induction. The samples were monitored for xylitol formation from L-arabinose by HPLC analysis using an Aminex HPX-87P column (BioRad, USA). After 24 hrs post induction, the XR/Lad1/Alx1 operon strain (ZUC99/pATX112) displayed a 2% conversion of L-arabinose to xylitol, showing that the recombinant bacterium acquires the ability to produce xylitol from L-arabinose (Table 6).

1. additionAfter incubation, an aliquot of the culture was diluted 100-fold into 20 mL of fresh LB media
2. custom(30° C., 250 RPM)
3. customfor 2 hrs
4. customwas incubated at 30° C.
5. stirringwith shaking (250 RPM) and aliquots
6. customwere removed at various time points after the IPTG induction