Part:BBa_K4156076

Promoter pCadC

pCadC is a pH-sensitive promoter, designed to response the low-pH conditions.

Usage and Biology

pCadC is regulated by membrane-tethered activator protein (CadC), exhibits higher activity in acidic media than in media at neutral pH. In pH reporter strains, it’s used to test their response to acidic conditions in tumors induction.^[1-2]

pH induced promoter testing

We constructed a pH reporter consisting of the pH-inducible promoter pCadC+mRFP. To test itsperformance, we added reporter in different chassis organisms. Fig 1,2 illustrates that pCadC induces the expression of the downstream gene mRFP with the decrease of pH. Thus, it can be seen that pH reporter can work properly.

Figure 1: Induction of downstream gene mRFP expression with different pH values in different chassis organisms over 48h.

Figure 2: Induction of downstream gene mRFP expression over time by a pH reporter consisting of pCadC+mRFP at different pH values.

References

1 Schlundt A, Buchner S, Janowski R, et al. Structure-function analysis of the DNA-binding domain of a transmembrane transcriptional activator. Sci Rep. Apr 21 2017;7(1):1051. doi:10.1038/s41598-017-01031-9

2 Lee YH, Kim JH, Bang IS, Park YK. The membrane-bound transcriptional regulator CadC is activated by proteolytic cleavage in response to acid stress. J Bacteriol. Jul 2008;190(14):5120-6. doi:10.1128/jb.00012-08

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
  INCOMPATIBLE WITH RFC[1000]

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