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Flood R, Cerofolini L, Fragai M, Crowley PB. Multivalent Calixarene Complexation of a Designed Pentameric Lectin. Biomacromolecules 2024; 25:1303-1309. [PMID: 38227741 PMCID: PMC10865345 DOI: 10.1021/acs.biomac.3c01280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 12/20/2023] [Accepted: 12/20/2023] [Indexed: 01/18/2024]
Abstract
We describe complex formation between a designed pentameric β-propeller and the anionic macrocycle sulfonato-calix[8]arene (sclx8), as characterized by X-ray crystallography and NMR spectroscopy. Two crystal structures and 15N HSQC experiments reveal a single calixarene binding site in the concave pocket of the β-propeller toroid. Despite the symmetry mismatch between the pentameric protein and the octameric macrocycle, they form a high affinity multivalent complex, with the largest protein-calixarene interface observed to date. This system provides a platform for investigating multivalency.
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Affiliation(s)
- Ronan
J. Flood
- SSPC,
Science Foundation Ireland Research Centre for Pharmaceuticals, School
of Biological and Chemical Sciences, University
of Galway, University
Road, Galway H91 TK33, Ireland
| | - Linda Cerofolini
- Magnetic
Resonance Center (CERM), University of Florence, Via L. Sacconi 6, 50019 Sesto, Fiorentino, Italy
- Consorzio
Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP), Via L. Sacconi 6, 50019 Sesto, Fiorentino, Italy
- Department
of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia 3, 50019 Sesto, Fiorentino, Italy
| | - Marco Fragai
- Magnetic
Resonance Center (CERM), University of Florence, Via L. Sacconi 6, 50019 Sesto, Fiorentino, Italy
- Consorzio
Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP), Via L. Sacconi 6, 50019 Sesto, Fiorentino, Italy
- Department
of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia 3, 50019 Sesto, Fiorentino, Italy
| | - Peter B. Crowley
- SSPC,
Science Foundation Ireland Research Centre for Pharmaceuticals, School
of Biological and Chemical Sciences, University
of Galway, University
Road, Galway H91 TK33, Ireland
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