Part:BBa_K3633016

pTac promoter

Description

This is a common promoter that can be induced by IPTG. The iGEM20_Shanghai_SFLS_SPBS use the promoter to accomplish experiments including production of melanin and test of IPTG-induced sfGFP production.

Experiment and Results

Successful production of melanin in E.coli BL21(DE3) and vibrio natriegens with promoter pTac

We constructed the plasmid pTac-Tyr1 and successfully transformed the plasmid into E. coli BL21(DE3) and Vibrio natriegens ATCC 14048. We added 2.5 mg L-DOPA, 0.4 mg L-Tyrosine and 1mM IPTG as substrates and cultured the bacteria in shakers (220 rpm) at 37℃. The result shows that melanin was produced. However the effect of pTac promoter is not as good as the constitutive promoter J23102.

Fig 3.Production of melanin in E. coli BL21(DE3) and Vibrio natriegens at 37℃ in 78 h. The horizontal axis is time (hours), and the vertical axis is absorbance of the bacterial solution at 400 nm.

Sequence & 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]