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| Home > Articles > Published articles > Self-assembling as regular nanoparticles dramatically minimizes photobleaching of tumour-targeted GFP |
| Home > Articles > Published articles > Self-assembling as regular nanoparticles dramatically minimizes photobleaching of tumour-targeted GFP |
(Institut d'Investigació Biomèdica Sant Pau) (Universitat Autònoma de Barcelona. Institut de Biotecnologia i de Biomedicina "Vicent Villar Palasí") (Institut de Recerca Sant Joan de Déu) (Universitat de Barcelona. Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals) (Universitat Autònoma de Barcelona. Institut de Biotecnologia i de Biomedicina "Vicent Villar Palasí") (Institut d'Investigació Biomèdica Sant Pau) (Universitat Autònoma de Barcelona. Departament de Genètica i de Microbiologia) (Universitat Autònoma de Barcelona. Institut de Biotecnologia i de Biomedicina "Vicent Villar Palasí")
| Date: | 2020 |
| Abstract: | Fluorescent proteins are useful imaging and theranostic agents, but their potential superiority over alternative dyes is weakened by substantial photobleaching under irradiation. Enhancing protein photostability has been attempted through diverse strategies, with irregular results and limited applicability. In this context, we wondered if the controlled oligomerization of Green Fluorescent Protein (GFP) as nanoscale supramolecular complexes could stabilize the fluorophore through the newly formed protein-protein contacts, and thus, enhance its global photostability. For that, we have here analyzed the photobleaching profile of several GFP versions, engineered to self-assemble as tumour-homing nanoparticles with different targeting, size and structural stability. This has been done under prolonged irradiation in confocal laser scanning microscopy and by small-angle X-ray scattering. The results show that the oligomerization of GFP at the nanoscale enhances, by more than seven-fold, the stability of fluorescence emission. Interestingly, GFP nanoparticles are much more resistant to X-ray damage than the building block counterparts, indicating that the gained photostability is linked to enhanced structural resistance to radiation. Therefore, the controlled oligomerization of self-assembling fluorescent proteins as protein nanoparticles is a simple, versatile and powerful method to enhance their photostability for uses in precision imaging and therapy. Statement of significance: Fluorescent protein assembly into regular and highly symmetric nanoscale structures has been identified to confer enhanced structural stability against radiation stresses dramatically reducing their photobleaching. Being this the main bottleneck in the use of fluorescent proteins for imaging and theranostics, this protein architecture engineering principle appears as a powerful method to enhance their photostability for a broad applicability in precision imaging, drug delivery and theranostics. |
| Grants: | Ministerio de Ciencia e Innovación SAF2017-8819-C3 Ministerio de Ciencia e Innovación BIO2016-76063-R Instituto de Salud Carlos III PI15/00272 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-229 |
| Rights: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.  |
| Language: | Anglès |
| Document: | Article ; recerca ; Versió acceptada per publicar |
| Subject: | Nanoparticles ; Fluorescent proteins ; Photostability ; Self-assembling ; Tumour targeting |
| Published in: | Acta Biomaterialia, Vol. 103 (Feb. 2020) , p. 272-280, ISSN 1878-7568 |
35 p, 893.9 KB |
