Screening specific binding peptides of Mycobacterium tuberculosis PPE17 protein by Phage display technique
10.3969/j.issn.1006-2483.2020.05.005
- VernacularTitle:噬菌体展示技术筛选结核分枝杆菌PPE17蛋白的特异性结合肽
- Author:
Jing ZHOU
1
;
Yi REN
1
;
Jun CHEN
1
;
Lifeng CHEN
1
Author Information
1. Clinical Laboratory of Wuhan Pulmonary Hospital , Wuhan, Hubei 430030, China
- Publication Type:Journal Article
- Keywords:
Mycobacterium tuberculosis;
PPE17 protein;
Phage display technique;
binding peptide
- From:
Journal of Public Health and Preventive Medicine
2020;31(5):18-20
- CountryChina
- Language:Chinese
-
Abstract:
Objective The specific binding peptide of Mycobacterium tuberculosis PPE17 protein was screened by phage display technique. Methods PPE17 gene was amplified from Mycobacterium tuberculosis genome, cloned into pET28a, expressed in E. coli BL21, purified by Ni2+ column, and identified by SDS-PAGE and Western blot. The purified PPE17 protein was coated into an ELISA plate and screened by phage 7 peptide library. After three rounds of panning, phage plaques were randomly selected for sequencing. DNAMAN was used to analyze and compare the amino acid sequences of the polypeptide encoded by the positive clones. Results PPE17 gene was successfully constructed and expressed, and soluble protein with molecular weight of about 37kD was obtained. From the third round of eluents, 20 plaque were randomly selected. The sequencing results could be translated into 8 polypeptide molecules, among which the polypeptide sequence repeated for 6 times was LKWGHVY. Conclusion The specific binding peptide of PPE17 protein is screened by phage display technology, which is expected to be a small molecular diagnostic reagent for the identification of this antigen.
