Volume 103, Issue 8, Pages (October 2012)

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Volume 103, Issue 8, Pages 1735-1743 (October 2012) Structure and Orientation of Bovine Lactoferrampin in the Mimetic Bacterial Membrane as Revealed by Solid-State NMR and Molecular Dynamics Simulation Atsushi Tsutsumi, Namsrai Javkhlantugs, Atsushi Kira, Masako Umeyama, Izuru Kawamura, Katsuyuki Nishimura, Kazuyoshi Ueda, Akira Naito Biophysical Journal Volume 103, Issue 8, Pages 1735-1743 (October 2012) DOI: 10.1016/j.bpj.2012.09.010 Copyright © 2012 Biophysical Society Terms and Conditions

Figure 1 Plot of association constants (Ka) of LFampinB against DMPG weight percentage in the DMPG and DMPC mixed membranes. Biophysical Journal 2012 103, 1735-1743DOI: (10.1016/j.bpj.2012.09.010) Copyright © 2012 Biophysical Society Terms and Conditions

Figure 2 Temperature variation of 31P NMR spectra of LFampinB-bacterial membrane systems. (a) Acidic phospholipids bilayer with a weight percentage of 65% DMPG, 10% CL, and 25% DMPC. (b) Addition of LFampinB. Biophysical Journal 2012 103, 1735-1743DOI: (10.1016/j.bpj.2012.09.010) Copyright © 2012 Biophysical Society Terms and Conditions

Figure 3 13C NMR spectra of [1-13C] Ala7-LFampinB incorporated in the bacterial membrane. (a) DD-MAS (4 kHz) NMR spectrum of hydrated bacterial membrane. (b) DD-static NMR spectrum of hydrated bacterial membrane. (c) Side-band pattern of the CP-MAS (2 kHz) NMR spectrum of lyophilized powder sample (signals with asterisks indicate those of lipid molecules). Biophysical Journal 2012 103, 1735-1743DOI: (10.1016/j.bpj.2012.09.010) Copyright © 2012 Biophysical Society Terms and Conditions

Figure 4 (Color figure online.) Contour plots of RMSD against ζ and γL3 for N-terminal α-helix of LFampinB (a and b). (a) Chemical shift anisotropies of four amino-acid residues (Leu3, Leu4, Ala7, Gln8) are considered for the RMSD calculation. (b) Chemical shift anisotropies of six amino-acid residues (Leu3, Leu4, Ala7, Gln8, Phe11, Gly12) considered for the RMSD calculation. (c) Chemical shift oscillation curve for the N-terminal α-helix of LFampinB calculated by taking into account four amino-acid residues (Leu3, Leu4, Ala7, Gln8). Experimentally obtained values are also shown (solid circles). Biophysical Journal 2012 103, 1735-1743DOI: (10.1016/j.bpj.2012.09.010) Copyright © 2012 Biophysical Society Terms and Conditions

Figure 5 Schematic representation of membrane-bound structure for LFampinB by solid-state NMR. (a) Most probable alignment and structure bound to bacterial membrane. (b) Helix wheel and plane angle for carbonyl carbons. The X axis indicates the direction from bilayer normal to the helix axis. Carbonyl plane normal shows 93° from the Y axis. Biophysical Journal 2012 103, 1735-1743DOI: (10.1016/j.bpj.2012.09.010) Copyright © 2012 Biophysical Society Terms and Conditions

Figure 6 (Color figure online.) Snapshots of LFampinB in the DMPG membrane (a) before and (b) after 10-ns simulation. The hydrophilic side chains of Lys, Glu, Arg, and α-helix conformation of the peptide backbone are shown (blue, red, cyan, and orange, respectively). Lipid headgroups of phosphatidylglycerol parts, myristic acid chain parts, and water molecules are shown (green, gray, and red, respectively). For simplicity, the hydrophobic side chains of LFampinB, sodium, and chloride ions are not shown. Biophysical Journal 2012 103, 1735-1743DOI: (10.1016/j.bpj.2012.09.010) Copyright © 2012 Biophysical Society Terms and Conditions

Figure 7 Tilt-angle ζ of LFampinB (a) and distance between the center of mass of LFampinB helix and membrane center (b) as a function of simulation time. The tilt angle ζ was calculated between the principal axis of LFampinB helix and the Z′ axis, which is normal to the membrane. The principal axis of LFampinB helix was calculated using the backbone main-chain atoms that keep the α-helical structure from residues 2–10. Time dependence of the plane angle γ of carbonyl carbon atom of Leu3 from Y axis in helix wheel (c). The angle was calculated as a clockwise angle from the Y helix axis. Biophysical Journal 2012 103, 1735-1743DOI: (10.1016/j.bpj.2012.09.010) Copyright © 2012 Biophysical Society Terms and Conditions