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Table 4 χ2 for angular variables for triplet clique compositions exhibiting specific geometry

From: Mapping the distribution of packing topologies within protein interiors shows predominant preference for specific packing motifs

Composition Frequency χ2(θ1t) χ2(θ2t) Χ2(θ3t) χ2(φ1s) χ2(φ2s) χ2(φ3s)
PHE ILE LEU 276 48.5 11.2 35.8 15.3 14.5 5.8
PHE LEU VAL 246 60.0 20.6 5.2 14.0 8.5 6.8
PHE LEU LEU 237 72.1 25.5 13.5 13.9 20.8 3.8
TYR ILE LEU 151 39.0 2.9 7.3 20.5 16.0 10.0
PHE ILE VAL 150 37.7 9.3 16.7 19.4 4.9 19.5
TYR PHE LEU 117 44.6 6.2 2.8 18.5 5.7 10.6
TYR LEU LEU 104 46.7 15.2 8.6 6.4 5.3 16.4
TYR LEU VAL 98 35.5 8.7 9.5 7.4 3.1 6.6
PHE VAL VAL 88 21.6 24.9 5.1 14.1 4.2 4.5
TYR PHE VAL 77 20.3 3.0 4.0 9.0 10.2 2.0
TYR ILE VAL 69 23.4 2.5 3.8 4.5 2.0 4.7
TRP LEU LEU 47 29.5* 4.0* 5.1* 3.9 17.7 2.9
TRP LEU VAL 41 23.9* 5.3* 3.0* 6.3 6.3 3.9
  1. χ2 of tilt angles (θ1t, θ2t, θ3t) and swivel angles (φ1s, φ2s, φ3s) of residues constituting the clique (where 1, 2, 3 corresponds to the same sequence of residues given in the table e.g., PHE → 1, ILE → 2, LEU → 3 for the first entry) for compositions showing significant deviation in θ1t from a random distribution. χ2 0.05 for three-bin and six-bin models are 5.991 and 11.071, respectively. Compositions which have a predicted frequency of less than 5 for any particular angular bin, assuming a random distribution are marked with an asterisk (*). This minimal number (of data points) is 37 for a 3-bin and 74 for a 6-bin model for tilt (θt) angles and 30 for a 6-bin model for swivel (φs) angles.