Part:BBa_K4722003

NicX-K13D

Sequence and Features

Assembly Compatibility:

• 10
  INCOMPATIBLE WITH RFC[10]

  Illegal PstI site found at 762
  
• 12
  INCOMPATIBLE WITH RFC[12]

  Illegal PstI site found at 762
  
• 21
  COMPATIBLE WITH RFC[21]
• 23
  INCOMPATIBLE WITH RFC[23]

  Illegal PstI site found at 762
  
• 25
  INCOMPATIBLE WITH RFC[25]

  Illegal PstI site found at 762
  Illegal NgoMIV site found at 921
  
• 1000
  COMPATIBLE WITH RFC[1000]

Usage and Biology

The enzyme NicX, derived from the bacterium Bacteroides xylanisolvens, exhibits a predicted core structure akin to the computational model of the established nicotine-degrading enzyme, NicA. Notably, NicX demonstrates proficiency in the degradation of nicotine. Furthermore, it has been observed that in the presence of NicX, B. xylanisolvens exhibits an enhanced capacity to degrade nicotine. Moreover, the transferability of nicX into Escherichia coli has been demonstrated, with the DNA fragment encoding the full-length NicX gene being successfully cloned into the pET28a vector through conventional molecular cloning techniques (Pro-cet-cell). The 13th amino acid in the NicX peptide chain changes from K to D.

Design Consideration

The genetic construct was ligated into a pET28a plasmid vector and subsequently introduced into Escherichia coli strain BL21 (DE3). Enzymatic cleavage was performed at the NcoI and XhoI restriction sites, allowing for the precise integration of NicX-K13D. The original His tag on the plasmid was retained, which is useful for subsequent protein purification steps. A point mutation was introduced to NicX, altering its gene sequence by replacing the 13th amino acid from K to D, with the aim of potentially enhancing its enzyme activity.

Enzyme Activity

TBD