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FitzGerald FG, Rodriguez Benavente MC, Garcia C, Rivero Y, Singh Y, Wang H, Fields GB, Cudic M. TF-containing MUC1 glycopeptides fail to entice Galectin-1 recognition of tumor-associated Thomsen-Freidenreich (TF) antigen (CD176) in solution. Glycoconj J 2020; 37:657-666. [PMID: 33001366 DOI: 10.1007/s10719-020-09951-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 08/28/2020] [Accepted: 09/25/2020] [Indexed: 12/31/2022]
Abstract
Aberrant Mucin-1 (MUC1) glycosylation with the Thomsen-Friedenreich (TF) tumor-associated antigen (CD176) is a hallmark of epithelial carcinoma progression and poor patient prognosis. Recognition of TF by glycan-binding proteins, such as galectins, enables the pathological repercussions of this glycan presentation, yet the underlying binding specificities of different members of the galectin family is a matter of continual investigation. While Galectin-3 (Gal-3) recognition of TF has been well-documented at both the cellular and molecular level, Galectin-1 (Gal-1) recognition of TF has only truly been alluded to in cell-based platforms. Immunohistochemical analyses have purported Gal-1 binding to TF on MUC1 at the cell surface, however binding at the molecular level was inconclusive. We hypothesize that glycan scaffold (MUC1's tandem repeat peptide sequence) and/or multivalency play a role in the binding recognition of TF antigen by Gal-1. In this study we have developed a method for large-scale expression of Gal-1 and its histidine-tagged analog for use in binding studies by isothermal titration calorimetry (ITC) and development of an analytical method based on AlphaScreen technology to screen for Gal-1 inhibitors. Surprisingly, neither glycan scaffold or multivalent presentation of TF antigen on the scaffold was able to entice Gal-1 recognition to the level of affinity expected for functional significance. Future evaluations of the Gal-1/TF binding interaction in order to draw connections between immunohistochemical data and analytical measurements are warranted.
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Affiliation(s)
- Forrest G FitzGerald
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, FL, 33431, USA.,Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Maria C Rodriguez Benavente
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, FL, 33431, USA.,Department of Biochemistry and Molecular Biology, Complex Carbohydrate Research Center, University of Georgia, 120 E Green St, Athens, GA, 30602, USA
| | - Camelia Garcia
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, FL, 33431, USA
| | - Yaima Rivero
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, FL, 33431, USA
| | - YashoNandini Singh
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, FL, 33431, USA
| | - Hongjie Wang
- Department of Chemistry and Biochemistry, Florida Atlantic University, Jupiter, FL, USA
| | - Gregg B Fields
- Department of Chemistry and Biochemistry, Florida Atlantic University, Jupiter, FL, USA.,Department of Chemistry, The Scripps Research Institute/Scripps Florida, Jupiter, FL, USA
| | - Maré Cudic
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, FL, 33431, USA.
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