TP-ⅠM,A polymer of Tachyplesin Ⅰ

Descrption

Tachyplesin Ⅰ(TP-Ⅰ)is a cysteine-rich antimicrobial peptide derived from the hemocytes of horseshoe crabs.The TP-ⅠM is composed of four TP-Ⅰs.The TP-1M containing 73 amino acids was joined by E, cleavage sites of Glu-C.

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
COMPATIBLE WITH RFC[1000]

2020 SZPT-CHINA

Construction of the antimicrobial Peptides Multimer(TP-ⅠM)

Since TP-Ⅰ is composed of only a few amino acids, it is difficult to biosynthesize directly. Firstly, antimicrobial Peptides Multimer was constructed. TP-ⅠM containing 73 amino acids was joined by E, cleavage sites of Glu-C. The amino acid sequence of TP-ⅠM is shown in Fig.1.

Fusion expression of TP-ⅠM in E. coli system

Construction and Identification of Recombinant Expression Vector of antimicrobial peptides

We cloned the TP-ⅠM gene into the pGEX-4T-2 expression vector. Positive clones were selected from LB plates containing 100μg/mL ampicillin for restriction analysis. The results show that the fragment size is the same as TP-ⅠM, shown in Fig.2. Hence, the recombinant expression vector pGEX-4T-2-TP-ⅠM was successfully constructed.

Expression of GST-TP-1M in E. coli BL21

The recombinant strain E. coli BL21 (DE3) with pGEX-4T-2-TP-1M vector was induced by IPTG for 6 hours and then collected for SDS-PAGE and Western blot analysis. The results of SDS-PAGE were shown in Fig.3. After IPTG induction, the E. coli BL21 transferred with pGEX-4T-2 vector produced 26kDa GST protein and E. coli BL21 transferred with pGEX-4T-2-TP1M produced 36kDa protein matched well with our GST-TP1M fusion protein.In contrast, Non-induced E. coli BL21 cells did not express GST or GST-TP-1M.Western blot results showed 36kDa fusion protein carry GST tag. The results showed that the constructed tandem TP-1M could be expressed in the fusion expression system.

Part:BBa_K3487001