TABLE III

Cytoplasmic Membrane Interface Residues Contributing >1 kcal/mole Static Field Energy to the Interaction of K+ along the Pore for Z < 0 Å

Cytoplasmic membrane interface
KirBac1.1 K57 S59 P61 F63 R148 R151 — R153 Q182 
Kir1.1 D74 K76 R78 K80 K181 R184 K187 R188 K218 
Kir2.1 D78 R80 R82 M84 K182 K185 K188 R189 K219 
Kir3.1 D77 K79 R81 N83 K183 Q186 K189 R190 N220 
Kir6.2 D65 K67 P69 T71 K170 Q173 R176 R177 K207 
Cytoplasmic membrane interface
KirBac1.1 K57 S59 P61 F63 R148 R151 — R153 Q182 
Kir1.1 D74 K76 R78 K80 K181 R184 K187 R188 K218 
Kir2.1 D78 R80 R82 M84 K182 K185 K188 R189 K219 
Kir3.1 D77 K79 R81 N83 K183 Q186 K189 R190 N220 
Kir6.2 D65 K67 P69 T71 K170 Q173 R176 R177 K207 

Residues are aligned across the five Kir channels to show the variation at each position between strongly contributing residues (bold) and non-electrostatic counterparts (italics). The blue spheres in Fig. 1 A highlight the positions of these nine sites.

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