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Default Solution structure and orientation of the transmembrane anchor domain of the HIV-1-en

Solution structure and orientation of the transmembrane anchor domain of the HIV-1-encoded virus protein U by high-resolution and solid-state NMR spectroscopy.

Related Articles Solution structure and orientation of the transmembrane anchor domain of the HIV-1-encoded virus protein U by high-resolution and solid-state NMR spectroscopy.

Biochemistry. 1999 Apr 20;38(16):5272-82

Authors: Wray V, Kinder R, Federau T, Henklein P, Bechinger B, Schubert U


The structure of the membrane anchor domain (VpuMA) of the HIV-1-specific accessory protein Vpu has been investigated in solution and in lipid bilayers by homonuclear two-dimensional and solid-state nuclear magnetic resonance spectroscopy, respectively. Simulated annealing calculations, using the nuclear Overhauser enhancement data for the soluble synthetic peptide Vpu1-39 (positions Met-1-Asp-39) in an aqueous 2,2,2-trifluoroethanol (TFE) solution, afford a compact well-defined U-shaped structure comprised of an initial turn (residues 1-6) followed by a linker (7-9) and a short helix on the N-terminal side (10-16) and a further longer helix on the C-terminal side (22-36). The side chains of the two aromatic residues (Trp-22 and Tyr-29) in the longer helix are directed toward the center of the molecule around which the hydrophobic core of the folded VpuMA is positioned. As the observed solution structure is inconsistent with the formation of ion-conductive membrane pores defined previously for VpuMA in planar lipid bilayers, the isolated VpuMA domain as peptide Vpu1-27 was investigated in oriented phospholipid bilayers by proton-decoupled 15N cross polarization solid-state NMR spectroscopy. The line widths and chemical shift data of three selectively 15N-labeled peptides are consistent with a transmembrane alignment of a helical polypeptide. Chemical shift tensor calculations imply that the data sets are compatible with a model in which the nascent helices of the folded solution structure reassemble to form a more regular linear alpha-helix that lies parallel to the bilayer normal with a tilt angle of
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