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Amyloid-like fibrils from a diphenylalanine capped with an aromatic fluorenyl

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Martí Ballesté, DídacMés informació
Mayans Tayadella, EnricMés informacióMés informació
Gil, Ana M.
Díaz Andrade, Angélica María
Jimenez Sanz, Ana Isabel
Yousef, Ibraheem
Keridou, InaMés informació
Cativiela, Carlos
Puiggalí Bellalta, JordiMés informacióMés informacióMés informació
Alemán Llansó, CarlosMés informacióMés informacióMés informació
Document typeArticle
Defense date2018-11-19
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
The self-assembly behavior of a diphenylalanine amphiphile blocked at the C-terminus with a 9-fluorenylmethyl ester and stabilized at the N-terminus with a trifluoroacetate (TFA) anion, TFA·FF-OFm, has been examined. At low peptide concentration (0.5 mg/mL), long amyloid-like fibrils, which come from the fusion of two or more helical ribbons and/or thinner fibrils, organized in bundles or as individual entities are detected. Microbeam synchrotron radiation infrared spectroscopy has shown that TFA·FF-OFm molecules in amyloid-like fibrils arrange, forming antiparallel ß-sheets. Alteration of the experimental conditions to prioritize the thermodynamic contribution with respect to the kinetic one in the self-assembly process inhibits the organization of amyloid-like structures in favor of the formation of conventional fibrous structures. On the basis of experimental observations, a structural model where the individual antiparallel ß-sheets are oriented in parallel has been proposed for TFA·FF-OFm amyloid-like fibrils.
CitationMartí, D. [et al.]. Amyloid-like fibrils from a diphenylalanine capped with an aromatic fluorenyl. "Langmuir", 19 Novembre 2018, vol. 34, núm. 50, p. 15551-15559. 
URIhttp://hdl.handle.net/2117/127843
DOI10.1021/acs.langmuir.8b03378
ISSN0743-7463
Publisher versionhttps://pubs.acs.org/doi/10.1021/acs.langmuir.8b03378
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