BIOINORGANIC CHEMISTRY A Short Course Second Edition

S4, cyan

S1, red

S2

S5, red

G200

tyr199

gly198 val197

thr196

K+ ions

gly220

asp62

arg126 arg123

arg133

arg120 arg117

S3b, rose

S3a, rose

pore helix, red

S6, blue

Extracellular side

Intracellular side

Figure 5.7 View of the K + ion channel, the pore helix, and helices S1 – S6, PDB: 1ORQ.
Visualized using CambridgeSoft Chem3D Ultra 10.0 with notations in ChemDraw
Ultra 10.0. (Printed with permission of CambridgeSoft Corporation.)