Glycoengineered Outer Membrane Vesicles as a Platform for Vaccine Development

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28 Scopus citations

Abstract

As we enter into the postantibiotic era, vaccines to prevent bacterial infections previously treatable with antibiotics are urgently needed. Most successful antibacterial vaccines are glycoconjugates, composed of cell surface carbohydrates chemically attached to a carrier protein. Glycoconjugate vaccines provide a safe and consistent strategy against polysaccharide-encapsulated pathogens. The best examples are the conjugate vaccines against Haemophilus influenzae type b, Streptococcus pneumoniae, and Neisseria meningitidis, all based on capsular polysaccharides. Although these types of vaccines are effective, their current manufacturing process presents multiple drawbacks, such as biosafety risks and batch-to-batch variability. Furthermore, inclusion of additional serotypes is extremely slow, mainly due to the intricate chemical methods of conjugation. Thus, novel platforms for antibacterial vaccines are required. Gram-negative bacteria are able to produce outer membrane vesicles (OMVs). OMVs are mainly composed of lipopolysaccharide (LPS), outer membrane and periplasmic proteins, and phospholipids. Although their biogenesis is poorly understood, it is known that OMVs are formed by blebbing of the outer membrane. OMVs are attractive candidates for novel vaccine delivery platforms due to their immunogenic properties, self-adjuvanticity, and capacity for enhancement by recombinant engineering. We have shown that OMVs can be engineered to display surface glycans from different bacteria and that these glycoengineered OMVs (geOMVs) are effective in diverse animal models of infection. Here we provide a detailed method for the design and preparation of geOMV displaying the O-antigen from a prominent uropathogenic Escherichia coli (UPEC) serotype, O25b, as a proof of concept for the use of geOMVs as vaccine candidates.

Original languageEnglish
Title of host publicationMethods in Enzymology
PublisherAcademic Press Inc.
Pages285-310
Number of pages26
DOIs
StatePublished - 2017

Publication series

NameMethods in Enzymology
Volume597
ISSN (Print)0076-6879
ISSN (Electronic)1557-7988

Keywords

  • Antigen
  • Escherichia coli
  • Glycoengineering
  • LPS
  • Outer membrane vesicles
  • UTI
  • Vaccine
  • geOMVs

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