[Expression, Purification and Structure Prediction of Hum s1, a Major Allergen of Humulus Scandens].

OBJECTIVE

Hum s1, a major allergen of Humulus Scandens, was cloned, expressed and purified. Its protein structure and function was predicted and analyzed, which provided a foundation for further studies into the diagnostic and therapeutic efficacy of the recombinant allergen.

METHODS

The target gene was amplified by PCR and sub-cloned into the expression vector pET32a through Kpn I /Xho I site. The recombinant plasmid was transformed into clone strain E. coli DH5α. The positive recombinant plasmid identified by PCR was transformed into expression strain E. coli BL-21. The expressed fusion protein was induced by IPTG, and purified using fast protein liquid chromatography. The structure and function of the protein was predicted and analyzed.

RESULTS

Prokaryotic expression plasmid pET32a-G2 was constructed successfully. Hum s1 was expressed and purified. The purity of expressed fusion protein exceeded 90%. It has three potential antigen epitopes and two EF-hand structural domains. A three-dimensional model was successfully constructed. The recombinant protein was proved to have immunological activity, with ELESA showing good attachment to sera samples of patients who were allergic to Humulus Scandens.

CONCLUSIONS

Prokaryotic expression vector of Hum s1 was successfully constructed. The recombinant protein was expressed and purified, with its epitope and three-dimensional model being predicted by bioinformatics. The study provided a basis for further development of recombinant vaccines.