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. Author manuscript; available in PMC: 2012 Sep 10.
Published in final edited form as: J Magn Reson. 2000 May;144(1):150–155. doi: 10.1006/jmre.2000.2035

FIG. 1.

FIG. 1

PISEMA spectra calculated for a 19-residue α-helix with 3.6 residues per turn and uniform dihedral angles at various helix tilt angles relative to the bilayer normal. A. 0°. B. 10°. C. 20°. D. 30°. E. 40°. F. 50°. G. 60°. H. 70°. I. 80°. J. 90°. Spectra were calculated on a Silicon Graphics O2 computer (Mountain View, CA), using the FORTRAN program FINGERPRINT (21, 24). The principal values and molecular orientation of the 15N chemical shift tensor (σ11 = 64 ppm; σ22 = 77 ppm; σ33 = 217 ppm; σ33NH = 17°) and the NH bond distance (1.07 Å) were as previously determined (19).