2lj2

Integral membrane core domain of the mercury transporter MerF in lipid bilayer membranes

spinqualitylabelsall models 2lj2 Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2lj2 is a 1 chain structure with sequence from Morganella morganii. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q56446_MORMO Publication Abstract from PubMed An NMR method for determining the three-dimensional structures of membrane proteins in proteoliposomes is demonstrated by determining the structure of MerFt, the 60-residue helix-loop-helix integral membrane core of the 81-residue mercury transporter MerF. The method merges elements of Oriented Sample (OS) solid-state NMR and Magic Angle Spinning (MAS) solid-state NMR techniques to measure orientation restraints relative to a single external axis (the bilayer normal) from individual residues in a uniformly 13C/15N labeled protein in unoriented liquid crystalline phospholipid bilayers. The method relies on the fast (>105 Hz) rotational diffusion of membrane proteins in bilayers to average the static chemical shift anisotropy and heteronuclear dipole-dipole coupling powder patterns to axially symmetric powder patterns with reduced frequency spans. The frequency associated with the parallel edge of such motionally averaged powder patterns is exactly the same as that measured from the single line resonance in the spectrum of a stationary sample that is macroscopically aligned parallel to the direction of the applied magnetic field. All data are collected on unoriented samples undergoing MAS. Averaging of the homonuclear 13C/13C dipolar couplings, by MAS of the sample, enables the use of uniformly 13C/15N labeled proteins, which provides enhanced sensitivity through direct 13C detection as well as the use of multidimensional MAS solid-state NMR methods for resolving and assigning resonances. The unique feature of this method is the measurement of orientation restraints that enable the protein structure and orientation to be determined in liquid crystalline phospholipid bilayers. Structure Determination of a Membrane Protein in Proteoliposomes.,Das BB, Nothnagel HJ, Lu GJ, Son WS, Tian Y, Marassi FM, Opella SJ J Am Chem Soc. 2012 Jan 4. PMID:22217388 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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