Interaction with model phospholipid membranes of lupin seed γ-conglutin, a glycaemia-lowering protein from Lupinus albus seeds, has been studied by means of Fourier-Transform infrared spectroscopy at p2H 7.0 and at p2H 4.5. The protein maintains the same secondary structure both at p2H 7.0 and at p2H 4.5, but at p2H 7.0 a higher 1H/2H exchange was observed, indicating a greater solvent accessibility. The difference in Tm and TD1/2 of the protein at the abovementioned p2H's has been calculated around 20 °C. Infrared measurements have been then performed in the presence of DMPG and DOPA at p2H 4.5. DMPG showed a little destabilizing effect while DOPA exerted a great stabilizing effect, increasing the Tm of γ-conglutin at p2H 4.5 of more than 20 °C. Since γ-conglutin at p2H 4.5 is in the monomeric form, the interaction with DOPA likely promotes the oligomerization even at p2H 4.5. Interaction between DMPG or DOPA and γ-conglutin has been confirmed by turbidity experiments with DMPC:DMPG or DOPC:DOPA SUVs. Turbidity data also showed high-affinity binding of γ-conglutin to anionic SUVs made up with DOPA. The molecular features outlined in this study are relevant to address the applicative exploitation and to delineate a deeper comprehension of the natural functional role of γ-conglutin.
Titolo: | Interaction of γ-conglutin from Lupinus albus with model phospholipid membranes: Investigations on structure, thermal stability and oligomerization status |
Autori: | DURANTI, MARCELLO MARIA (Penultimo) SCARAFONI, ALESSIO (Ultimo) |
Parole Chiave: | DMPG; DOPA; FT-IR spectroscopy; Glycaemia; Model phospholipid membranes; Oligomerization; SUV; Turbidity; γ-Conglutin |
Settore Scientifico Disciplinare: | Settore BIO/10 - Biochimica |
Data di pubblicazione: | dic-2018 |
Rivista: | |
Tipologia: | Article (author) |
Data ahead of print / Data di stampa: | 9-ott-2018 |
Digital Object Identifier (DOI): | 10.1016/j.bbapap.2018.10.005 |
Appare nelle tipologie: | 01 - Articolo su periodico |
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