Abstract
Siglecs are known to be bound and regulated by membrane molecules that display specific sialic acid-containing ligands and are present on the same cell (cis-ligands). Because of the low-affinity binding of Siglecs to the glycan ligands, conventional methods such as immunoprecipitation are not suitable for identification of Siglec cis-ligands. Here we describe efficient and specific labeling of cis-ligands of CD22 (also known as Siglec-2) on B lymphocytes by proximity labeling using tyramide. This method may also be applicable to labeling of cis-ligands of other Siglecs.
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Acknowledgments
This work was funded by JPSP Grant-in-Aid for Scientific Research 26293062 (T.T.) and the Joint Usage/Research Program of Medical Research Institute, Tokyo Medical and Dental University (T.T.).
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Alborzian Deh Sheikh, A., Akatsu, C., Tsubata, T. (2020). Identification of Siglec Cis-Ligands by Proximity Labeling. 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_8
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DOI: https://doi.org/10.1007/978-1-0716-0430-4_8
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