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Biological ice formation - Probing the interplay between ice-nucleating protein structures and interfacial water with ultrafast 2D sum frequency generation (SFG) spectroscopy

Descrizione del progetto

Risolvere il mistero della nucleazione del ghiaccio biologicamente guidata

La formazione di ghiaccio dal congelamento dell’acqua è uno dei processi più cruciali per la vita sul nostro pianeta. Gli organismi nucleanti del ghiaccio si sono adattati a temperature inferiori allo zero utilizzando proteine di nucleazione del ghiaccio. che ne controllano la formazione. Questa capacità dei batteri attivi nel ghiaccio viene sfruttata in applicazioni biomimetiche di congelamento in agricoltura, nella creazione di ghiaccio artificiale e in altri settori. Tuttavia, finora i meccanismi molecolari che consentono la formazione di ghiaccio guidata dalle proteine sono rimasti un mistero. Per colmare il divario, il progetto ProIce, finanziato dall’UE, effettuerà ricerche sulla funzione delle proteine di nucleazione del ghiaccio a livello molecolare utilizzando i recenti progressi nella spettroscopia vibrazionale ultraveloce. Genererà importanti conoscenze per modelli climatici e tecnologie di congelamento del futuro.

Obiettivo

Water freezing and ice formation are fundamental processes for life on Earth. Ice active bacteria are the most efficient ice nucleators known. These specialized bacteria catalyse liquid-solid phase transitions of water at high subzero temperatures using ice-nucleating proteins (INPs). Despite the critical and well-recognized importance of ice bacteria on local and global precipitation, frost damage in agriculture and their potential for biomimetic freezing applications, the molecular mechanisms behind protein-driven ice formation remain largely elusive. In this project, I want to study the function of INPs at the molecular level using tools provided by recent advances of ultrafast vibrational spectroscopy. Supported by experienced scientists in the host group, I will develop a novel two-colour two-dimensional sum frequency generation (2D SFG) approach that will enable me to address the fundamental aspects of protein and water structure, molecular motion and energy flow. First, I will elucidate the secondary structure and conformation of a new model bacterial INP at a lipid membrane-water interface. Then, I will follow ultrafast energy transfer from interfacial water layers to the surrounding media to test the hypothesis that INPs can remove latent heat of nucleation from the nucleation site. Finally, I will study the effect of inter-protein distance and aggregation on the ultrafast energy transfer. The project will be supported with molecular dynamics simulations, protein engineering and cryo-electron microscopy by collaborators. My experience in non-linear optical spectroscopy combined with the excellent scientific environment in the host group will make it possible now to gain new insights into the mechanism of biological ice formation that were not accessible previously. The findings will be of interest for an interdisciplinary audience, and could provide input for next generation climate models and freezing technologies.

Coordinatore

AARHUS UNIVERSITET
Contribution nette de l'UE
€ 207 312,00
Indirizzo
NORDRE RINGGADE 1
8000 Aarhus C
Danimarca

Mostra sulla mappa

Regione
Danmark Midtjylland Østjylland
Tipo di attività
Higher or Secondary Education Establishments
Collegamenti
Costo totale
€ 207 312,00