Panning using a phage-displayed random peptide library to identify peptides that antagonize the Helicobacter pylori ArsS acid-sensing domain
| Autor: | Zhibang Yang, Pu Chen, Jin Zhang, Yu Xiang, Yuxia Xiong, Jinyang Li |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Phage display 030106 microbiology Microbial Sensitivity Tests Microbiology law.invention 03 medical and health sciences Bacterial Proteins Peptide Library law Bacteriophages Homology modeling Binding site Panning (camera) chemistry.chemical_classification Binding Sites Helicobacter pylori biology Chemistry Gene Expression Regulation Bacterial biology.organism_classification Recombinant Proteins In vitro Amino acid Molecular Docking Simulation 030104 developmental biology Infectious Diseases Biochemistry Recombinant DNA Peptides Acids Signal Transduction |
| Zdroj: | Microbial Pathogenesis. 135:103614 |
| ISSN: | 0882-4010 |
| DOI: | 10.1016/j.micpath.2019.103614 |
| Popis: | Helicobacter pylori is an important etiological factor involved in chronic gastritis, peptic ulcer, and gastric cancer. There are currently no optimal preventive or therapeutic interventions for H. pylori infection. H. pylori survives in the stomach by sensing and adapting to the highly acidic environment by using the two-component signal transduction system that contains the most widely known gastric acid receptor, ArsRS (which is composed of ArsS and ArsR). This study aimed to identify peptides that antagonize the acid-sensing domain of H. pylori ArsS. These peptides could be used to block the acid-sensing signal and thereby hinder H. pylori adaption to acidic environments to prevent its survival. Using proSite, the functional domains (including the N-terminal acid-sensing domain) of H. pylori J99 ArsS were predicted. The purified recombinant ArsS N-terminal acid-sensing protein (P-ArsS-A) was used as the target in a panning protocol in which peptides from the Ph.D.-7 Phage Display Peptide Library that could bind to P-ArsS-A were identified. As a result, eight phage clones that could specifically bind to P-ArsS-A were obtained and five amino acid sequences were identified, including P03 (MMSYPKH) and P06 (LTPMPNW). An in vitro minimum inhibitory concentration (MIC) evaluation showed that P03 and P06 significantly inhibited the growth of H. pylori J99. The MIC of P03 was 8 μM, and the MIC of P06 was >16 μM, indicating that P03 is a stronger inhibitor compared to P06. This was confirmed by colony counting on blood agar plates after P03 and P06 administration. Using homology modeling and molecular docking analysis, it was shown that P03 and P06 could bind to the ArsS N-terminal domain, and there were four shared binding sites: TYR25, ASN39, ARG73, and GLU74. Additionally, one hydrogen bond was found between P03 and ArsS, which is more cohesive than other forms of bonding (van der Waals force, other non-covalent bonds). |
| Databáze: | OpenAIRE |
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