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Bertoncini, P. & Chauvet, O. (2010) Conformational Structural Changes of Bacteriorhodopsin Adsorbed onto Single-Walled Carbon Nanotubes. J. Phys. Chem. B, 114 4345–4350.
Added by: Laurent Cournède (2016-03-10 21:37:33) |
| Type de référence: Article DOI: 10.1021/jp9103432 Numéro d'identification (ISBN etc.): 1520-6106 Clé BibTeX: Bertoncini2010 Voir tous les détails bibliographiques  |
Catégories: PMN Mots-clés: dynamics, halobacterium-halobium, lipids, peptides, protein, purple membrane, Stability, transform-infrared-spectroscopy Créateurs: Bertoncini, Chauvet Collection: J. Phys. Chem. B |
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The interaction between purple membranes, composed of proteins of bacteriorhodopsin (bR) and their native Surrounding lipids, and single-walled carbon nanotubes (SWNT) has been investigated. In this work, sonication has been used to debundle SWNT in buffer solution without surfactant before the addition of native purple membranes. The sample was then sonicated in a bath for a short time, followed by a centrifugation. The supernatants contain proteins in excess and SWNT as individual and small bundles covered by a bR layer with an average thickness of 1.5 nm. TEM and AFM observations support the idea that only a protein monolayer surrounds the tubes. Optical absorption and infrared spectroscopy measurements provide evidence that the proteins adsorbed onto the SWNT undergo orientational changes of the helical segments in bR and helix conformational changes. We ascribe the main driving force to the hydrophobic interactions between the sidewall of the SWNT and the hydrophobic residues of the alpha-helices of bR.
Added by: Laurent Cournède |