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. Author manuscript; available in PMC: 2010 Jul 8.
Published in final edited form as: Biochemistry. 2008 Jun 24;47(25):6531–6538. doi: 10.1021/bi800362b

Figure 4.

Figure 4

Membrane orientation of OmpX. (A and D) OmpX after refinement against the dipolar couplings measured for the seven Phe residues. The average tilt angle (τ) between the barrel axis (b) and the membrane normal (Z) is 7.3° (±1.6°). The hydrophobic thickness of the barrel is ~24 Å. (B and E) OmpX orientation from the PDBTM database. (C and F) OmpX orientation from the OPM database. The PDBTM and OPM coordinates were rotated around the Z axis to obtain views comparable to those in panels A and D. Amide nitrogen atoms are shown as spheres, with H–D exchangeable residues colored black (F90, F107, and F148) and nonexchangeable residues colored red (F24, F43, F115, and F125). (D–F) Views from the top of the Z axis.