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Using LC-MS to Identify Clipping in Self-Assembled Nanoparticles During Vaccine Development.


ABSTRACT: A hemagglutinin stabilized stem nanoparticle (HA-SS-np) that is designed to provide broad protection against influenza is being developed as a potential vaccine. During an early formulation screening study, reducing gel (rCGE) analysis indicated product degradation in a few candidate buffers at the first-week accelerated stability point, whereas no change was shown in the size exclusion chromatography (SEC) measurement. A LC-MS workflow was therefore applied to investigate the integrity of this large HA-SS-np vaccine molecule (??1 MDa). Application of LC-MS was critical to rationalize the conflicting results from the rCGE and SEC assays and led to the discovery that (1) an unexpected sequence clipping in the HA-SS-np subunits occurred, explaining the atypical reducing gel profile, and (2) an undisrupted disulfide bond held the two fragments together, explaining the unchanged SEC profile. This analytical case study led to a formulation buffer redesign, which mitigated the issue.

SUBMITTER: Schneck NA 

PROVIDER: S-EPMC7780558 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature

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Using LC-MS to Identify Clipping in Self-Assembled Nanoparticles During Vaccine Development.

Schneck Nicole A NA   Ivleva Vera B VB   Rosales-Zavala Erwin E   Wang Xiangchun X   Gollapudi Deepika D   Cooper Jonathan W JW   Lei Q Paula QP  

Journal of the American Society for Mass Spectrometry 20191008 12


A hemagglutinin stabilized stem nanoparticle (HA-SS-np) that is designed to provide broad protection against influenza is being developed as a potential vaccine. During an early formulation screening study, reducing gel (rCGE) analysis indicated product degradation in a few candidate buffers at the first-week accelerated stability point, whereas no change was shown in the size exclusion chromatography (SEC) measurement. A LC-MS workflow was therefore applied to investigate the integrity of this  ...[more]

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