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Research at St Andrews

The tetraspanin Tspan15 is an essential subunit of an ADAM10 scissor complex

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DOI

Author(s)

Chek Ziu Koo, Neale Harrison, Peter J Noy, Justyna Szyroka, Alexandra L Matthews, Hung-En Hsia, Stephan A Müller, Johanna Tüshaus, Joelle Goulding, Katie Willis, Clara Apicella, Bethany Cragoe, Edward Davis, Murat Keles, Antonia Malinova, Thomas A McFarlane, Philip R Morrison, Hanh T H Nguyen, Michael C Sykes, Haroon Ahmed & 11 more Alessandro Di Maio, Lisa Seipold, Paul Saftig, Eleanor Cull, Christos Pliotas, Eric Rubinstein, Natalie S Poulter, Stephen J Briddon, Nicholas D Holliday, Stefan F Lichtenthaler, Michael G Tomlinson

School/Research organisations

Abstract

A disintegrin and metalloprotease 10 (ADAM10) is a transmembrane protein essential for embryonic development, and its dysregulation underlies disorders such as cancer, Alzheimer's disease and inflammation. ADAM10 is a "molecular scissor" that proteolytically cleaves the extracellular region from >100 substrates, including Notch, amyloid precursor protein, cadherins, growth factors, and chemokines. ADAM10 has been recently proposed to function as six distinct scissors with different substrates, depending on its association with one of six regulatory tetraspanins, termed TspanC8s. However, it remains unclear to what degree ADAM10 function critically depends on a TspanC8 partner, and a lack of monoclonal antibodies specific for most TspanC8s has hindered investigating this question. To address this knowledge gap, here we designed an immunogen to generate the first monoclonal antibodies targeting Tspan15, a model TspanC8. The immunogen was created in an ADAM10-knockout mouse cell line stably overexpressing human Tspan15, because we hypothesized that expression in this cell line would expose epitopes that are normally blocked by ADAM10. Following immunization of mice, this immunogen strategy generated four Tspan15 antibodies. Using these antibodies, we show that endogenous Tspan15 and ADAM10 co-localize on the cell surface, that ADAM10 is the principal Tspan15-interacting protein, that endogenous Tspan15 expression requires ADAM10 in cell lines and primary cells, and that a synthetic ADAM10/Tspan15 fusion protein is a functional scissor. Furthermore, two of the four antibodies impaired ADAM10/Tspan15 activity. These findings suggest that Tspan15 directly interacts with ADAM10 in a functional scissor complex.

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Original languageEnglish
JournalJournal of Biological Chemistry
Early online date28 Feb 2020
DOIs
Publication statusE-pub ahead of print - 28 Feb 2020

    Research areas

  • Tspan15, ADAM10, A disintegrin and metalloprotease, Tspan14, Metalloproteinases, Tetraspanin, ADAM, Monoclonal antibody, Shedding, Membrane protein

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