Part:BBa_K3866009

Acetate production construct

Usage and Biology

2 Trancription Units

• AckA BBa_K3866006 and PtaBBa_BBa_K3866006regulated by arabinose inducible promoter araBAD for the prduction of Acetate

Design Notes

The coding sequence was domesticated . We removed BsmBI and BsaI sites in order to be compatible with GoldenBraid and MoClo. The sequence is cloned in seva omega1R vectorBBa_K3505010 and has overhangs compatible for GoldenBraid cloning.

Figure 1. The final level omega module of the Actetate Production

Verification of Cloning

Fig.2:: (U=Uncut , C= Cut)Positive clone 2. Expected bands: 3153 bp, 1769 bp, 1757 bp, 1447 bp, 1160 bp

Experimental Use and Experience

Before we start producing SCFAs, we needed to optimize our protein expression system.

Fig.3::SDS page (L=Lysate S=Souble I=Insoluble)(0%, 0,1%, 1% L-arabinose inducer) Expected bands:Pta 77,2 kDa and AckA 43,7 kDa

The enzymes are expressed in high levels. Even at induction with really low concentration 0,1% L-arabinose we observe that the enzyme is present in every collumn. There is a lot enzyme at the insoluble where it shouldn't be. So we must lower the protein production. This can be acheived by lowering the induction from L-arabinose, use a less powerfull promoter and less strong RBS.

Sequence and Features

Assembly Compatibility:

• 10
  INCOMPATIBLE WITH RFC[10]

  Illegal PstI site found at 2853
  Illegal PstI site found at 3399
  Illegal PstI site found at 3699
  Illegal PstI site found at 3864
  
• 12
  INCOMPATIBLE WITH RFC[12]

  Illegal PstI site found at 2853
  Illegal PstI site found at 3399
  Illegal PstI site found at 3699
  Illegal PstI site found at 3864
  
• 21
  INCOMPATIBLE WITH RFC[21]

  Illegal BamHI site found at 3503
  
• 23
  INCOMPATIBLE WITH RFC[23]

  Illegal PstI site found at 2853
  Illegal PstI site found at 3399
  Illegal PstI site found at 3699
  Illegal PstI site found at 3864
  
• 25
  INCOMPATIBLE WITH RFC[25]

  Illegal PstI site found at 2853
  Illegal PstI site found at 3399
  Illegal PstI site found at 3699
  Illegal PstI site found at 3864
  Illegal AgeI site found at 1959
  Illegal AgeI site found at 2357
  Illegal AgeI site found at 3603
  Illegal AgeI site found at 3801
  
• 1000
  COMPATIBLE WITH RFC[1000]

References

• Dittrich, C. R., Bennett, G. N., & San, K. Y. (2005). Characterization of the acetate-producing pathways in Escherichia coli. Biotechnology progress, 21(4), 1062–1067. https://doi.org/10.1021/bp050073s