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Establishment of a human cell line with a surface display system for screening and optimizing Na + -taurocholate cotransporting polypeptide-binding peptides.

Authors :
Wang PY
Yang X
Guo L
Wang YW
Zhang WL
Sun YX
Li J
Gan CY
Long SY
Liu JJ
Fan SY
Huang AL
Hu JL
Source :
Frontiers in microbiology [Front Microbiol] 2022 Aug 17; Vol. 13, pp. 920280. Date of Electronic Publication: 2022 Aug 17 (Print Publication: 2022).
Publication Year :
2022

Abstract

One of the most desirable targets for HBV medications is the sodium taurocholate cotransporting polypeptide (NTCP), an entry receptor for the hepatitis B virus (HBV). N-myristoylated preS1 2-48 (Myrcludex B or Hepcludex), an NTCP-binding peptide from the large surface protein of HBV, has been developed as the first-in-class entry inhibitor. However, its relatively large molecular weight contributes to increased immunogenicity and antibody production. As a result, it is preferable to look for an NTCP-binding peptide with a smaller size. To do this, we developed a human cell surface display strategy and screened peptides based on preS1-21. PreS1-21 (genotype D) was extended by 7 random amino acids and fused with mCherry and FasL transmembrane domain. The pooled constructs were transfected into HEK293 cells by using the transposon/transposase system to create a library displaying various peptides on the cell surface with red fluorescence. On the other hand, we expressed NTCP protein fused with EGFP on HEK293 and used the membrane lysate containing NTCP-GFP as the bait protein to select peptides with increased NTCP affinity. After 7 cycles of selection, the deep sequencing results revealed that some polypeptides were more than 1,000 times enriched. Further screening of the mostly enriched 10 peptides yields the peptide preS1-21-pep3. Replacing the preS1-21 sequence of preS1-21-pep3 with those from different genotypes demonstrated that the consensus sequence of genotype A-F had the best performance. The peptide (Myr-preS1-21-pep3) was synthesized and tested on the HepG2-NTCP cell model. The results showed that Myr-preS1-21-pep3 is approximately 10 times more potent than the initial peptide Myr-preS1-21 in preventing HBV infection. In conclusion, we developed a new strategy for screening peptides binding to membrane proteins and identified a new NTCP-binding peptide with a much smaller size than Hepcludex.<br />Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.<br /> (Copyright © 2022 Wang, Yang, Guo, Wang, Zhang, Sun, Li, Gan, Long, Liu, Fan, Huang and Hu.)

Details

Language :
English
ISSN :
1664-302X
Volume :
13
Database :
MEDLINE
Journal :
Frontiers in microbiology
Publication Type :
Academic Journal
Accession number :
36060770
Full Text :
https://doi.org/10.3389/fmicb.2022.920280