Frey, A.M., Satur, M.J., Phansopa, C. et al. (4 more authors) (2018) Evidence for a novel Carbohydrate Binding Module (CBM) of Tannerella forsythia NanH sialidase, key to interactions at the host-pathogen interface. Biochemical Journal, 475 (6). pp. 1159-1176. ISSN 0264-6021
Abstract
Bacterial sialidases cleave terminal sialic acid from a variety of host glycoproteins, and contribute to survival and growth of many human-dwelling bacterial species, including various pathogens.Tannerella forsythia, an oral, Gram-negative, fastidious anaerobe, is a key organism in periodontal disease, and possesses a dedicated sialic acid utilisation and scavenging (nan) operon, including NanH sialidase. Here, we describe biochemical characterisation of recombinant NanH, including its action on host-relevant sialoglycans such as sialyl Lewis A and sialyl Lewis X (SLeA/X), and on human cell-attached sialic acids directly, uncovering that it is a highly active broad specificity sialidase. Furthermore, theN-terminal domain of NanH was hypothesised and proven to be capable of binding to a range of sialoglycans and non-sialylated derivatives withKdin the micromolar range, as determined by steady-state tryptophan fluorescence spectroscopy, but it has no catalytic activity in isolation from the active site. We consider this domain to represent the founding member of a novel subfamily of Carbohydrate Binding Module (CBM), involved in glycosidase-ligand binding. In addition, we created a catalytically inactive version of the NanH enzyme (FRIP→YMAP) that retained its ability to bind sialic acid-containing ligands and revealed for the first time that binding activity of a CBM is enhanced by association with the catalytic domain. Finally, we investigated the importance of Lewis-type sialoglycans onT. forsythia-host interactions, showing that nanomolar amounts of SLeA/Xwere capable of reducing invasion of oral epithelial cells byT. forsythiasuggesting that these are key ligands for bacterial-cellular interactions during periodontal disease.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 The Author(s). This is an author produced version of a paper subsequently published in Biochemical Journal. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | glycobiology; host-pathogen interactions; oral bacteria; sialic acid; sialidase/neuraminidase; tannerella forsythia |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Medicine, Dentistry and Health (Sheffield) > School of Clinical Dentistry (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 09 Mar 2018 12:12 |
Last Modified: | 09 Oct 2020 13:27 |
Status: | Published |
Publisher: | Portland Press |
Refereed: | Yes |
Identification Number: | 10.1042/BCJ20170592 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:128237 |