P-atp2 mutant 705-B0034-lacz alpha
The natural P-atp2 is an alkali-induced promoter in Corynebacterium glutamicum located in F0F1 ATPase operon. The natural P-atp2 promoter responds to the pH changes from pH 7.0 to pH 9.0, especially at alkaline pH. When the pH value increasing, the expression increased modestly. It is activated by the alternative sigma factor of the RNA polymerase, whose synthesis would be activated when the bacteria are growing at alkaline pH.
The activity of this mutant at different pH is shown in figure 1.
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Usage and Biology
The verification of alkali-induced promoter P-atp2's transcription function (BBa_K1675021) Data
At first,we used error-prone PCR to mutate the natural P-atp2 and get various P-atp2 mutants, which have different efficiency and different respongsing ranges. The steps of EP-PCR are shown below (Fig.1).
Fig.1 The four steps of EP-PCR.
Then, we mutated the EcoRI site of the promoter by single-step mutation. And we determined the activity of P-atp2 in different pH from 5.0 to 9.0 by measuring the activity of enzyme β-galactosidase(LacZ). As these bacteria grew normally and the OD600 was up to about 1.5, we lysed cells, then added ONPG to start a color reaction and recorded the response time. After adding the sodium carbonate solution (1M) to terminate the reaction, we measured the OD420 and OD550, which could be put into the formula to calculate the activity(Table. 1).
Table. 1 The formula to calculate the enzyme activity of β-galactosidase. According to the β-galactosidase activities (Fig.2), we can get the transcription ability of P-atp2 under the different pH environment.
Fig.2 The β-galactosidase activities in different pH from 5.0 to 9.0.
Sequence and Features
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- 1000COMPATIBLE WITH RFC