Part:BBa_K4340613

ldhA

This is a gene that encodes protein ldhA and produces lactic acid. Gene accession code: 946315

ldhA is the gene code of the alkaline shooting circuit (with P-atp2 promoter) in the genetic pH shooting system.

genetic pH shooting system (BBa_K4340609) and pET11a empty vector pH maintenance functional test

Experiment 1: pH change and OD value

Figure 1. The pH change of genetic pH shooting system_pET11a in the pH 7 initial environment

Figure 2. The pH change of genetic pH shooting system_pET11a in the pH 8 initial environment

Figure 3. The pH change of genetic pH shooting system_pET11a in the pH 9 initial environment

Photo 1: The pH adjusted LB broth for pH changes test.

In the initial pH 7 environment, the pH curve of both groups are relatively similar, showing that the system does not function in a pH 7 environment, which conforms to the promoter design (Pasr for acidic environment and P-atp2 for alkaline environment) (Figure 1)

In both initial pH 8 and pH 9, the pH level of the genetic pH shooting system drops more than the control group (pET11a). This demonstrated that the base shooting circuit functioned to neutralize the alkaline environment. (Figure 2 & 3)

Figure 4. The OD change of genetic pH shooting system_pET11a in the pH 7 initial environment

Figure 5. The OD change of genetic pH shooting system_pET11a in the pH 8 initial environment

Figure 6. The OD change of genetic pH shooting system_pET11a in the pH 9 initial environment

For the OD change of the genetic pH shooting system, The highest OD value is in the pH 7 environment, followed by pH 8, and pH 9. The OD value of pH 9 is lower than the other pH groups (pH 7, 8, and 9 of the genetic pH shooting system), which shows that the transformed E.coli might not grow as well as E.coli with an empty pET11a vector since it has to produce alkaline.

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
  INCOMPATIBLE WITH RFC[25]

  Illegal AgeI site found at 559
  
• 1000
  INCOMPATIBLE WITH RFC[1000]

  Illegal SapI site found at 828