Vesicle Nucleation Peptide Fusion Induced Extracellular Vesicles Are Distinct From Escherichia coli Outer Membrane Vesicles, and Provide an Enhanced Platform for Protein Production and Purification.

Authors

Bree R Streather, Tara A Eastwood, Karen Baker, Mingzhi Liang, Alexandra E Bailie, Tijn T van der Velden, Lars J C Jeuken, Stanley W Botchway, Lin Wang, Daniel P Mulvihill

Published in

Journal of extracellular vesicles. Volume 15. Issue 8. Pages e70354.

Abstract

Bacterial outer membrane vesicles (OMVs) are nano-sized, spherical structures released by Gram-negative bacteria that play diverse roles in bacterial physiology, including communication, nutrient acquisition and host interactions. These vesicles bud from the bacterial outer membrane and contain lipopolysaccharides, periplasmic proteins, nucleotides and other biomolecules. The vesicle nucleating peptide (VNp) is a short peptide tag that, when fused to the amino terminus of a protein of interest, promotes the formation of bespoke recombinant extracellular vesicles (EVs) in Escherichia coli, enabling efficient production and simplified purification of recombinant proteins. Here, we characterise VNp-induced extracellular vesicles (VNp-EVs) and compare their composition and organisation with OMVs produced from E. coli expressing a periplasmic targeting fusion. While both vesicle types possess a single outer membrane-derived lipid bilayer, recombinant protein is highly enriched within the VNp-EVs compared to OMVs containing the periplasm targeting ssDsbA-fusion protein. VNp-fusions and the periplasm-targeted recombinant protein localise to distinct vesicle populations, with VNp-fusions showing markedly higher luminal concentrations and relative vesicular abundance, compared to the vesicles containing a periplasmic targeted fusion protein. OmpX co-expression further enriched the VNp-fusion content of vesicles, further enhancing yield. The VNp-vesicle lumen is an oxidising environment, thus supports formation of inter- and intra-molecular disulfide bonds within encapsulated proteins. Overall, VNp-EVs represent a distinct class of recombinant EVs that offer a simple and efficient route for producing and purifying concentrated, correctly folded recombinant proteins, expanding the utility of bacterial vesicle systems for biotechnological applications.

PMID:
42599979
Bibliographic data and abstract were imported from PubMed on 15 Aug 2026.

Read full publication at:
Please sign in to see all details.

Stats

1-terrible, 9-excellent. How would you rate this publication? Sign in in to submit your rating.

Post a comment

You need to be signed in to post comments. You can sign in here.

Comments

There are no comments yet.