Abstract
Shiga toxin (Stx) is a major virulence factor of enterohemorrhagic Escherichia coli (E. coli). Stx consists of one enzymatic A subunit and five B subunits (StxB) that are involved in binding. The StxB pentamer specifically recognizes a glycosphingolipid, globotriaosylceramide (Gb3), as a receptor; therefore, it can be used as a probe to detect Gb3. This chapter describes the preparation of recombinant Stx1B proteins using E. coli, their conjugation with fluorescent dyes, and their application for flow cytometry. The prepared fluorescent StxB proteins bound to cells of several lines, including the HeLa human cervix adenocarcinoma cell line and the THP-1 human monocytic leukemia cell line. Furthermore, the probe was useful for confirmation of several sphingolipid-deficient HeLa cell lines that were constructed using genome editing.
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Acknowledgments
This work was supported by AMED (No. JP19ae0101068j0104, 19fm0208005j0103) and JSPS KAKENHI (No. JP17K07357).
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Yamaji, T. (2020). Preparation of Fluorescent Recombinant Shiga Toxin B Subunit and Its Application to Flow Cytometry. In: Hirabayashi, J. (eds) Lectin Purification and Analysis. Methods in Molecular Biology, vol 2132. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-0430-4_45
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DOI: https://doi.org/10.1007/978-1-0716-0430-4_45
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