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CTB labelling for ChemRXiv.pdf (619.08 kB)
Sortase-Modified Cholera Toxoids Show Specific Golgi Localization
Preprints are manuscripts made publicly available before they have been submitted for formal peer review and publication. They might contain new research findings or data. Preprints can be a draft or final version of an author's research but must not have been accepted for publication at the time of submission.
submitted on 29.07.2019 and posted on 29.07.2019by Darren Machin, Daniel Williamson, Peter Fisher, victoria miller, Gemma Wildsmith, James Ross, Christopher Wasson, Andrew MacDonald, Benjamin I. Andrews, Daniel Ungar, W. Bruce Turnbull, Michael Webb
Cholera toxoid is an established tool for use in cellular tracing in neuroscience and cell biology. We use a sortase-labelling approach to generate site-specifically N-terminally modified variants of both the A2-B5 heterohexamer and B5 pentamer forms of the toxoid. Both forms of the toxoid are endocytosed by GM1-positive mammalian cells, and while the heterohexameric toxoid was principally localized in the ER, the B5 pentamer showed an unexpected localization in the medial/trans Golgi. This study suggests a future role for specifically-labelled cholera toxoids in live-cell imaging beyond their current applications in neuronal tracing and labelling of lipid-rafts in fixed cells.