SMTL ID : 9eio.1

Cryo-EM structure of the mutant KCa2.2_F244S channel

Coordinates

PDB Format Compare

Method

ELECTRON MICROSCOPY 3.62 Å

Oligo State

hetero-4-4-mer

Ligands

4 x K: POTASSIUM ION(Non-covalent)

K.1: 3 residues within 4Å: Chain A: S.242 Chain B: S.242 Chain D: S.242 No protein-ligand interaction detected (PLIP) K.2: 8 residues within 4Å: Chain A: S.242, I.243 Chain B: S.242, I.243 Chain C: S.242, I.243 Chain D: S.242, I.243 3 PLIP interactions: 1 interactions with chain D, 1 interactions with chain A, 1 interactions with chain B Metal complexes: D:S.242, A:S.242, B:S.242 K.3: 9 residues within 4Å: Chain A: I.243, G.244 Chain B: I.243, G.244 Chain C: I.243, G.244 Chain D: I.243, G.244 Ligands: K.4 No protein-ligand interaction detected (PLIP) K.4: 6 residues within 4Å: Chain A: Y.245 Chain B: Y.245 Chain C: Y.245, G.246 Chain D: Y.245 Ligands: K.3 4 PLIP interactions: 1 interactions with chain C, 1 interactions with chain A, 1 interactions with chain B, 1 interactions with chain D Metal complexes: C:Y.245, A:Y.245, B:Y.245, D:Y.245

8 x CA: CALCIUM ION(Non-covalent)

CA.5: 5 residues within 4Å: Chain E: D.18, D.20, D.22, T.24, E.29 5 PLIP interactions: 5 interactions with chain E Metal complexes: E:D.18, E:D.20, E:D.22, E:T.24, E:E.29 CA.6: 4 residues within 4Å: Chain E: D.54, D.56, T.60, E.65 4 PLIP interactions: 4 interactions with chain E Metal complexes: E:D.56, E:T.60, E:E.65, E:E.65 CA.7: 4 residues within 4Å: Chain F: D.18, D.20, D.22, T.24 3 PLIP interactions: 3 interactions with chain F Metal complexes: F:D.18, F:D.22, F:T.24 CA.8: 4 residues within 4Å: Chain F: D.54, D.56, T.60, E.65 5 PLIP interactions: 5 interactions with chain F Metal complexes: F:D.54, F:D.56, F:T.60, F:E.65, F:E.65 CA.9: 5 residues within 4Å: Chain G: D.18, D.20, D.22, T.24, E.29 4 PLIP interactions: 4 interactions with chain G Metal complexes: G:D.18, G:D.22, G:T.24, G:E.29 CA.10: 5 residues within 4Å: Chain G: D.54, A.55, D.56, T.60, E.65 4 PLIP interactions: 4 interactions with chain G Metal complexes: G:D.56, G:T.60, G:E.65, G:E.65 CA.11: 5 residues within 4Å: Chain H: D.18, D.20, D.22, T.24, T.26 4 PLIP interactions: 4 interactions with chain H Metal complexes: H:D.18, H:D.22, H:D.22, H:T.24 CA.12: 5 residues within 4Å: Chain H: D.54, A.55, D.56, T.60, E.65 5 PLIP interactions: 5 interactions with chain H Metal complexes: H:D.54, H:D.56, H:T.60, H:E.65, H:E.65

Links

RCSB   PDBe   PDBe-KB   PDBj   PDBsum   CATH   PLIP

Citation

Nam, Y.W. et al., Cryo-EM structures of the small-conductance Ca2+-activated KCa2.2 channel. Nat Commun (2025)

Release Date

2025-04-23

Peptides

Small conductance calcium-activated potassium channel protein 2: ABCD
Calmodulin-1: EFGH

SMTL:PDB

SMTL Chain Id:
PDB Chain Id:

A
A

B
B

C
C

D
D

E
E

F
F

G
G

H
H

Membrane

We predict this structure to be a membrane protein.
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Small conductance calcium-activated potassium channel protein 2

Calmodulin-1

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