Cloning and Sequence Analysis of Mutant OmpF from Antibiotic Resistant Escherichia coli

摘要

[Objective]This study aimed to investigate the mutations of OmpF from an isolated antibiotic resistant Escherichia coli strain.[Methods]The mutant OmpF(mOmpF)from antibiotic resistant E.coli was amplified by PCR with Pfu DNA polymerase and ligated into the expression vector pET28a.Subsequently,the expression vector pET28-mOmpF was sequenced and analyzed by DNAMAN software and Swiss-Model online.[Result]Sequence analysis revealed that the open reading fragment of mOmpF was 903 bp long,which was mutated dramatically compared to that of the 1 020 bp long model OmpF.The DNA sequence shared only54.5%homology with OmpF.mOmpF was 44.6%identical to that of OmpF.Protein structure predication and analysis through Swiss-Model online suggested that the structure of mOmpF changed dramatically compared to OmpF.[Conclusion]The present study provided basis for further analyzing the relationships between the structure and functions of mOmpF from antibiotic resistant E.coli.