Comprehensive characterization of bacterial glycoconjugate vaccines by liquid chromatography - mass spectrometry.
Carbohydr Polym
; 341: 122327, 2024 Oct 01.
Article
en En
| MEDLINE
| ID: mdl-38876725
ABSTRACT
Bacterial pathogens can cause a broad range of infections with detrimental effects on health. Vaccine development is essential as multi-drug resistance in bacterial infections is a rising concern. Recombinantly produced proteins carrying O-antigen glycosylation are promising glycoconjugate vaccine candidates to prevent bacterial infections. However, methods for their comprehensive structural characterization are lacking. Here, we present a bottom-up approach for their site-specific characterization, detecting N-glycopeptides by nano reversed-phase liquid chromatography-mass spectrometry (RP-LC-MS). Glycopeptide analyses revealed information on partial site-occupancy and site-specific glycosylation heterogeneity and helped corroborate the polysaccharide structures and their modifications. Bottom-up analysis was complemented by intact glycoprotein analysis using nano RP-LC-MS allowing the fast visualization of the polysaccharide distribution in the intact glycoconjugate. At the glycopeptide level, the model glycoconjugates analyzed showed different repeat unit (RU) distributions that spanned from 1 to 21 RUs attached to each of the different glycosylation sites. Interestingly, the intact glycoprotein analysis displayed a RU distribution ranging from 1 to 28 RUs, showing the predominant species when the different glycopeptide distributions are combined in the intact glycoconjugate. The complete workflow based on LC-MS measurements allows detailed and comprehensive analysis of the glycosylation state of glycoconjugate vaccines.
Palabras clave
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Glicoconjugados
/
Vacunas Bacterianas
/
Glicopéptidos
Idioma:
En
Revista:
Carbohydr Polym
Año:
2024
Tipo del documento:
Article
País de afiliación:
Países Bajos