Part:BBa_K1469002

UDP-GlcDH

UDP-glucose 6-dehydrogenase of Bacillus megaterium. The enzyme catalyses the NAD dependent oxidation of UDP-glucose to UDP-glucuronic acid, a key precursor molecule for hyaluronic acid production.

Sequence and Features

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  COMPATIBLE WITH RFC[12]
• 21
  COMPATIBLE WITH RFC[21]
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  COMPATIBLE WITH RFC[1000]

Characterization by SSTi-SZGD(2018)

We characterized this part by co-overexpressing it with gtaB (BBa_K1469005) together in an operon. UDP-GlcDH is also known as tuaD in B.subtilis, and its gene product may contribute positively to HA production.

In our project, expression of the operon tuaD-gtaB was regulated under the control of a constitutive promoter P43, this operon is used for further increasing the production of the HA in B.subtilis. Gene products of tuaD and gtaB regulate the last two steps in the synthetic pathway of UDP-GlcUA, one of the two precursors of HA.

Fig1 the synthesis pathway of HA . In our experiment, by conducting CTAB experiments that form turbidity from a reaction between HA and CTAB solution, the results showed a remarkable increase in HA production when co-overexpressed tuaD-gtaB together (488mg/L, a 38% increase) (Figure2),In addition, Molecular weight analysis studies showed that HAs synthesized were high molecular weight(Figure3 ).

Figure 2: CTAB analysis of HA concentraton, a. Illustration of the turbidity by mixing different source of HA with CTAB solution. b: effects of overexpressing the precursor genes on HA production in recombinant B.

Figure 3: molecular weights of HA produced by overexpression of precursor genes in recombinant B. subtilis 168E strains using viscometer analysis.