Construction of TAT-BPI fusion protein prokaryotic expression vector

Abstract

Objective To enable BPI efficiently penetrate the cell membrane or a variety of barriers, and neutralize endotoxin in different anatomical parts, construct and identify a prokaryotic expression vector of TAT-BPI, in order to lay the foundation for new bio-antibiotic development. Methods A synthesized DNA fragment encoding TAT protein transduction domain was inserted into pUC57 vector. Then Total RNA was extracted from human polymorphonuclear neutrophils(PMN) and then the human BPI cDNA gene was amplified by RT-PCR. The PCR product was cloned into pUC57 plasmid and the sequence was confirmed by restriction enzyme digestion and dideoxy-mediated-chain termination. Results Restriction enzyme digestion and DNA sequence analysis revealed that bioactive N-terminal fragment of BPI were not only identical to those of the published human BPI sequence but also were contained in the recombinant vector. Conclusions pUC57-TAT-BPI is successfully constructed, which lays the foundation for studying the protein of BPI. Key words: TAT; Bactericidal / perme-ability increasing protein(BPI); Fusion protein