Extended data Table 2.
K2P2.1(TREK-1) B-factor and structure comparisions a, B-factor comparisons. Selectivity filter residue B-factors are below the average channel core B-factor in both the K2P2.1(TREK-1) and modulator bound structures. Modulator pocket residue B-factors drop relative to the average B-factor in both the ML335 and ML402 complexes, indicating that modulator binding reduces the mobility of these residues. The structures are determined in ~200 mM potassium, a concentration that is expected to stabilize the conformation of the selectivity filter (cf. Ref. 38) and that could mask mobility changes. Average B-factor is calculated using the channel core elements on both chains: M1 (residues 47-65), P1 through common part of M2 (residues 127-188), common part of M3 through common part M4 (residues 210-300). The selectivity filter was included in the calculation. Blue and red values are >10% below or above the average B-factor, respectively. b, K2P channel structure comparisons. RMSDs are calculated using the following K2P2.1(TREK-1) (5VK5) Chain A and Chain B elements: (ΔCAP, ΔM4) M1 through CAP (residues 47-69), P1 through common part of M4 (residues 127-281). Channel core (ΔCAP, ΔM2, ΔM4) M1 (residues 47-65), P1 through common part of M2 (residues 127-188), common part of M3 through common part M4 (residues 210-300). The selectivity filter was included in the calculation. For the non-domain-swapped K2P4.1(TRAAK)(3UM7), residues 47-69 of chain A were compared to equivalent chain B residues.
| Extended Data Table 2a | B-factor comparisons for K2P2.1(TREK-1) and modulator complexes
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|---|---|---|---|---|
| Location | Residue | B-factor (Å2) | ||
|
| ||||
| K2P2.1(TREK-1) | K2P2.1(TREK-1):ML335 | K2P2.1(TREK-1):ML402 | ||
| Selectivity filter | Gly144 | 108.6 | 63.0 | 92.7 |
| Phe145 | 109.7 | 64.7 | 98.4 | |
| Gly146 | 118.5 | 76.5 | 127.4 | |
|
| ||||
| Modulator pocket | Phe134 | 139.3 | 74.0 | 104.1 |
| Lys271 | 181.9 | 83.0 | 116.1 | |
| Trp275 | 156.5 | 69.9 | 103.2 | |
|
| ||||
| Channel core | 132.4 | 83.5 | 118.8 | |
| Extended Data Table 2b. Structural comparisons with K2p2.1 (TREK-1)
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|---|---|---|---|
| PDB code | K2p | Cα RMSD (Å) (ΔCAP, ΔM4) |
Cα RMSD(Å) Channel core (ΔCAP, ΔM2, ΔM4) |
| 5VKN | K2p 2.1(TREK-1):ML335 | 0.443 | 0.388 |
| 5VKP | K2p 2.1(TREK-1):ML402 | 0.462 | 0.426 |
| 4XDK | K2p 10.1 (TREK-2):Norfluoxetine | 1.976 | 1.317 |
| 4BW5 | K2p 10.1(TREK-2):M4 up | 1.054 | 0.918 |
| 4XDJ | K2p 10.1(TREK-2):M4 down | 1.790 | 1.331 |
| 419W | K2p 4.1(TRAAK) | 1.176 | 1.141 |
| 3UM7 | K2p 4.1(TRAAK) (no domain swap) | 1.468 | 1.390 |
| 4RUF | K2p 4.1(TRAAK) W262S | 1.351 | 1.288 |
| 4RUE | K2p 4.1(TRAAK) G124I | 1.466 | 1.490 |
| 4WFF | K2p 4.1(TRAAK) M4 down | 1.155 | 1.217 |
| 4WFE | K2p 4.1(TRAAK) M4 up | 1.149 | 1.023 |