Part:BBa_K1955000

pSB1C3-Hemagglutinin

The promoter and the ribosomal binding site of Leishmania genome has not been elucidated yet. We selected the 5'- untranslated region of a highly expressed gene, P36, to be the promoter, RBS binding site and other extra function needed for Leishmania protein expression. We also added a Hygromycin resistant gene as drug selection marker. AS a dual functional biobrick of regulatory and selection marker, we provide the user the regulation of protein expression and also the drug selection system that is most commonly and effectively used in Leishmania experiments. This biobrick needs to use with the 3'UTR that we provide as the terminator of the Leishmania to perform a complete protein expression system for Leishamnia. Add the protein sequence in between the Leish-5'UTR-HYG and Leish-3'UTR for leishmania to expression your target protein.

(1) Insert 5’HYG (<a href="https://parts.igem.org/Part:BBa_K1955003">BBa_K1955003</a>), 3’UTR (<a href="https://parts.igem.org/Part:BBa_K1955002">BBa_K1955002</a>), HA (<a href="https://parts.igem.org/Part:BBa_K1955000">BBa_K1955000</a>) and OVA (<a href="https://parts.igem.org/Part:BBa_K1955004">BBa_K1955004</a>) gBlocks into pSB1C3 vector:

The biobrick parts, including 5’HYG, 3’UTR, HA and OVA, were synthesized directly by IDT. After receiving the synthesized parts, we used EcoRI and PstI to digest the parts and pSB1C3 backbone, then ligated and transformed the DNA samples into DH5a competent cells. According to the digestion and colony PCR results of the colony, all the parts were inserted into the pSB1C3 vector with the right length of DNA sequences, 5’HYG is 1446 bp, HA is 1700 bp, OVA is 2098 bp and 3’UTR is 774 bp.
<img src="" width=550px height=300px style="border:2px black solid;border-radius:8px;"></img>

(Fig. 1) pSB1C3-3’UTR, pSB1C3-5’HYG, pSB1C3-OVA checked by colony PCR and enzyme digestion

(A),(C) The pSB1C3-3’UTR and pSB1C3-OVA were transformed and the colonies were picked to perform colony PCR. The forward primer sequence was 5’- GAATTCGCGGCCGCTTCTAGAG-3’, which was in the prefix site. And the reverse primer sequence was 5’-CTGCAGCGGCCGCTACTAGTA-3’, which was in the suffix site. The PCR reaction was performed with Taq polymerase, and screened in 0.8％ agarose gel by electrophoresis. As the results, a 700~800 bp sequence was proliferated in pSB1C3-3’UTR, and a 2000~2500 bp sequence was proliferated from pSB1C3-OVA. (B) The pSB1C3-5’HYG was transformed and the colonies were picked and amplified in LB broth. pSB1C3-5’HYG plasmid was purified by miniprep, and digested with EcoRI and PstI for 4 hrs, then screened in 0.8％ agarose gel by electrophoresis. The results showed a 2000 bp band of pSB1C3 and the 1500 bp 5’HYG.
<img src="" width=450px height=200px style="border:2px black solid;border-radius:8px;"></img>

(Fig. 2) The basic part checked by PCR

We used pSB1C3-5’HYG, pSB1C3-3’UTR, pSB1C3-HA, pSB1C3-OVA as template, to check the length of the inserts. The PCR reaction was performed with Taq polymerase, and screened in 0.8％ agarose gel by electrophoresis.

Sequence and Features

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  COMPATIBLE WITH RFC[12]
• 21
  INCOMPATIBLE WITH RFC[21]

  Illegal BamHI site found at 4
  Illegal BamHI site found at 1710
  
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  INCOMPATIBLE WITH RFC[1000]

  Illegal BsaI site found at 1640