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. 2016 Jan 18;6:19501. doi: 10.1038/srep19501

Figure 7. Tryptophan Trp-229 cation-π interaction angles and distances.

Figure 7

The BvHSS (PDB ID: 4TVB) subunit A Trp-229 and HSP (residue 37Z-502 in PDB ID: 4TVB) (a,b) and subunit B Trp-229 and PUT-502 (c,d) are shown in ball-and-stick representations. The plane of the indol ring of the Trp-229 side chain is indicated by a white surface cutting all spheres in half representing atoms lying on the aromatic plane. The black line represents the orthogonal vector to the aromatic plane with its origin at the center of the 6-membered (benzene) ring of the tryptophan side chain. The orthogonal projections of carbon C05 and nitrogen N06 of 37Z-502 (a,b) and of carbon C4 and nitrogen N2 of PUT-502 (c,d) are indicated as slightly smaller spheres named C05′, N06′, C4′, and N2′. All angle and distance measurements were performed with the measurement function implemented in the program PyMOL. The names of the angles and distances were chosen by analogy to Marshall et al.32.