Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/110437
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Type: | Journal article |
Title: | Structure aided design of a Neu5Gc specific lectin |
Author: | Day, C. Paton, A. Higgins, M. Shewell, L. Jen, F. Schulz, B. Herdman, B. Paton, J. Jennings, M. |
Citation: | Scientific Reports, 2017; 7(1):1495-1-1495-8 |
Publisher: | Nature Publishing Group |
Issue Date: | 2017 |
ISSN: | 2045-2322 2045-2322 |
Statement of Responsibility: | Christopher J. Day, Adrienne W. Paton, Melanie A. Higgins, Lucy K. Shewell, Freda E.-C. Jen, Benjamin L. Schulz, Brock P. Herdman, James C. Paton and Michael P. Jennings |
Abstract: | Subtilase cytotoxin (SubAB) of Escherichia coli is an AB5 class bacterial toxin. The pentameric B subunit (SubB) binds the cellular carbohydrate receptor, α2-3-linked N-glycolylneuraminic acid (Neu5Gc). Neu5Gc is not expressed on normal human cells, but is expressed by cancer cells. Elevated Neu5Gc has been observed in breast, ovarian, prostate, colon and lung cancer. The presence of Neu5Gc is prognostically important, and correlates with invasiveness, metastasis and tumour grade. Neu5Gc binding by SubB suggests that it may have utility as a diagnostic tool for the detection Neu5Gc tumor antigens. Native SubB has 20-fold less binding to N-acetlylneuraminic acid (Neu5Ac); over 30-fold less if the Neu5Gc linkage was changed from α2-3 to α2-6. Using molecular modeling approaches, site directed mutations were made to reduce the α2-3»α2-6-linkage preference, while maintaining or enhancing the selectivity of SubB for Neu5Gc over Neu5Ac. Surface plasmon resonance and glycan array analysis showed that the SubBΔS106/ΔT107 mutant displayed improved specificity towards Neu5Gc and bound to α2-6-linked Neu5Gc. SubBΔS106/ΔT107 could discriminate NeuGc- over Neu5Ac-glycoconjugates in ELISA. These data suggest that improved SubB mutants offer a new tool for the testing of biological samples, particularly serum and other fluids from individuals with cancer or suspected of having cancer. |
Keywords: | Animals Cattle Humans Neuraminic Acids Subtilisins Escherichia coli Proteins Lectins Enzyme-Linked Immunosorbent Assay Surface Plasmon Resonance Protein Engineering Binding Sites Mutation Models, Molecular Mutant Proteins |
Rights: | © The Author(s) 2017 This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
DOI: | 10.1038/s41598-017-01522-9 |
Grant ID: | http://purl.org/au-research/grants/nhmrc/1071659 http://purl.org/au-research/grants/nhmrc/1087975 http://purl.org/au-research/grants/arc/DP160102766 |
Published version: | http://dx.doi.org/10.1038/s41598-017-01522-9 |
Appears in Collections: | Aurora harvest 3 Molecular and Biomedical Science publications |
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hdl_110437.pdf | Published Version | 1.65 MB | Adobe PDF | View/Open |
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