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. 2004 Jan 29;101(6):1537–1542. doi: 10.1073/pnas.0306241101

Table 3. Helical and superhelical parameters of the Asn-16—Ala GCN4 leucine zipper trimers.

Crystal form
P3121
P43212
Structural methods Auto Hand Auto Hand
rmsd from ideal superhelix, Å 0.71 0.69 0.79 0.80
Supercoil radius, R0, Å 6.1 6.1 6.0 6.0
Residues per supercoil turn 99 100 98 99
Supercoil pitch, Å 144 146 143 144
Radius of curvature, Å 92 95 92 93
Superhelix crossing angle, χ 29.9° 29.3° 29.6° 29.5°
Position a orientation angle, ϕ 68.5° 67.9° 67.8° 67.8°
Residues per α-helix turn, n 3.62 3.62 3.63 3.63
Rise/residue, d, Å 1.50 1.51 1.50 1.50
α-helix radius (Cα), R1, Å 2.24 2.24 2.22 2.22
Pairwise helix-crossing angle, ω0 25.9° 25.3° 25.6° 25.4°
Pairwise interhelix distance, D, Å 10.6 10.5 10.5 10.4