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Alex JM, Corvaglia V, Hu X, Engilberge S, Huc I, Crowley PB. Crystal structure of a protein–aromatic foldamer composite: macromolecular chiral resolution. Chem Commun (Camb) 2019; 55:11087-11090. [DOI: 10.1039/c9cc05330a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A protein–foldamer crystal structure illustrates protein assembly by a sulfonated aromatic oligoamide, and chiral resolution of the foldamer helix handedness.
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Affiliation(s)
- Jimi M. Alex
- School of Chemistry
- National University of Ireland
- Galway
- Ireland
| | - Valentina Corvaglia
- Universite de Bordeaux
- CNRS
- Bordeaux Institut National Polytechnique, CBMN (UMR 5248)
- Institut Europeen de Chimie et Biologie
- Pessac 33600
| | - Xiaobo Hu
- Universite de Bordeaux
- CNRS
- Bordeaux Institut National Polytechnique, CBMN (UMR 5248)
- Institut Europeen de Chimie et Biologie
- Pessac 33600
| | | | - Ivan Huc
- Universite de Bordeaux
- CNRS
- Bordeaux Institut National Polytechnique, CBMN (UMR 5248)
- Institut Europeen de Chimie et Biologie
- Pessac 33600
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Hu X, Dawson SJ, Mandal PK, de Hatten X, Baptiste B, Huc I. Optimizing side chains for crystal growth from water: a case study of aromatic amide foldamers. Chem Sci 2017; 8:3741-3749. [PMID: 28553532 PMCID: PMC5428020 DOI: 10.1039/c7sc00430c] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Accepted: 03/08/2017] [Indexed: 01/16/2023] Open
Abstract
The growth of crystals of aromatic compounds from water much depends on the nature of the water solubilizing functions that they carry. Rationalizing crystallization from water, and structure elucidation, of aromatic molecular and supramolecular systems is of general value across various fields of chemistry. Taking helical aromatic foldamers as a test case, we have validated several short polar side chains as efficient substituents to provide both solubility in, and crystal growth ability from, water. New 8-amino-2-quinolinecarboxylic acids bearing charged or neutral aminomethyl, carboxymethyl, sulfonic acid, or bis(hydroxymethyl)-methoxy side chains in position 4 or 5, were prepared on a multi gram scale. Fmoc protection of the main chain amine and suitable protections of the side chains ensured compatibility with solid phase synthesis. One tetrameric and five octameric oligoamides displaying these side chains were synthesized and shown to be soluble in water. In all cases but one, crystals were obtained using the hanging drop method, thus validating the initial design principle to combine polarity and rigidity. The only case that resisted crystallization appeared to be due to exceedingly high water solubility endowed by eight sulfonic acid functions. The neutral side chain did provide crystal growth ability from water but contributed poorly to solubility.
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Affiliation(s)
- Xiaobo Hu
- Université de Bordeaux , CNRS , IPB , CBMN , UMR 5248 , Institut Européen de Chimie et Biologie , 2 Rue Escarpit , 33600 Pessac , France .
| | - Simon J Dawson
- Université de Bordeaux , CNRS , IPB , CBMN , UMR 5248 , Institut Européen de Chimie et Biologie , 2 Rue Escarpit , 33600 Pessac , France .
| | - Pradeep K Mandal
- Université de Bordeaux , CNRS , IPB , CBMN , UMR 5248 , Institut Européen de Chimie et Biologie , 2 Rue Escarpit , 33600 Pessac , France .
| | - Xavier de Hatten
- Université de Bordeaux , CNRS , IPB , CBMN , UMR 5248 , Institut Européen de Chimie et Biologie , 2 Rue Escarpit , 33600 Pessac , France .
| | - Benoit Baptiste
- Université de Bordeaux , CNRS , IPB , CBMN , UMR 5248 , Institut Européen de Chimie et Biologie , 2 Rue Escarpit , 33600 Pessac , France .
| | - Ivan Huc
- Université de Bordeaux , CNRS , IPB , CBMN , UMR 5248 , Institut Européen de Chimie et Biologie , 2 Rue Escarpit , 33600 Pessac , France .
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