Part:BBa_K3815008

LL37-Mxe GryA intein-PT-linker-His tag

Targeted protein

This part is for the purfication of antimicrobial peptide,LL37. This is derived from Homo sapiens. This can inhibit the growth of both the gram-positive and gram-negative bacteria. In our experiment, we used it to kill the bacteria in the vase water.

Purification system

This part is composed of His tag, Mxe Gyr intein, PT linker, and targeted protein. This is for the peptide intein tag purification. Producing peptide with His tag, it is recovered by Ni chromatography. After that, adding DTT to it, the N terminal of Mxe GyrA intein is cut. Then, we get the targeted protein. This method saves the time removing the tags compared to the method using only tags without intein.

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 NgoMIV site found at 637
  Illegal AgeI site found at 130
  Illegal AgeI site found at 331
  Illegal AgeI site found at 765
  
• 1000
  COMPATIBLE WITH RFC[1000]

Expression

• Cells were grown in 1000ml LB media at 37^oC shaking at 180 rpm.
• when the OD exceeded 0.35, 1 M IPTG 200μL was added to induce the peptide expression.
• Incubate at 30℃ at 180rpm for 6 hours after adding IPTG.

Purification

1.When this fused protein were produced, it was recovered by Ni chromatography
2.Adding DTT to it, the targeted protein was cut out by the cleavage of intein.
3.SDSPAGE was performed in order to confirm the presence of it.

Fig1 shows the result of SDS-PAGE. The lane 3 and 9 are the result of LL37.
LL37 is 4624Da, so these date shows that we could not confirm its production.