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lüll Solid-state NMR investigations of interaction contributions that determine the alignment of helical polypeptides in biological membranes Bechinger BFEBS Lett 2001[Aug]; 504 (3): 161-5Helical peptides reconstituted into oriented phospholipid bilayers were studied by proton-decoupled 15N solid-state NMR spectroscopy. Whereas hydrophobic channel peptides, such as the N-terminal region of Vpu of HIV-1, adopt transmembrane orientations, amphipathic peptide antibiotics are oriented parallel to the bilayer surface. The interaction contributions that determine the alignment of helical peptides in lipid membranes were analysed using model sequences, and peptides that change their topology in a pH-dependent manner have been designed. The energy contributions of histidines, lysines, leucines and alanines as well as the alignment of peptides and phospholipids under conditions of hydrophobic mismatch have been investigated in considerable detail.|Amino Acid Sequence[MESH]|Cell Membrane/*chemistry[MESH]|Hydrogen-Ion Concentration[MESH]|Kinetics[MESH]|Lipid Bilayers/metabolism[MESH]|Magnetic Resonance Spectroscopy/*methods[MESH]|Models, Biological[MESH]|Molecular Sequence Data[MESH]|Peptides/*chemistry[MESH]|Protein Conformation[MESH]|Protein Structure, Secondary[MESH]|Thermodynamics[MESH]|Viral Proteins/chemistry[MESH] |