SMTL ID : 8v2g.1

Cryo-EM structure of the KCa2.2 channel in apo state

Coordinates

PDB Format Compare

Method

ELECTRON MICROSCOPY

Oligo State

hetero-4-4-mer

Ligands

4 x K: POTASSIUM ION(Non-covalent)

K.1: 4 residues within 4Å: Chain A: S.242 Chain C: S.242 Chain E: S.242 Chain G: S.242 No protein-ligand interaction detected (PLIP) K.2: 8 residues within 4Å: Chain A: S.242, I.243 Chain C: S.242, I.243 Chain E: S.242, I.243 Chain G: S.242, I.243 4 PLIP interactions: 1 interactions with chain E, 1 interactions with chain G, 1 interactions with chain C, 1 interactions with chain A Metal complexes: E:I.243, G:I.243, C:I.243, A:I.243 K.3: 6 residues within 4Å: Chain A: I.243, G.244 Chain C: I.243 Chain E: I.243 Chain G: I.243, G.244 No protein-ligand interaction detected (PLIP) K.4: 4 residues within 4Å: Chain A: F.127 Chain C: F.127 Chain E: F.127 Chain G: F.127 No protein-ligand interaction detected (PLIP)

8 x CA: CALCIUM ION(Non-covalent)

CA.5: 5 residues within 4Å: Chain B: D.19, K.20, D.23, T.25, E.30 4 PLIP interactions: 4 interactions with chain B Metal complexes: B:D.19, B:T.25, B:E.30, B:E.30 CA.6: 6 residues within 4Å: Chain B: D.55, D.57, N.59, T.61, I.62, E.66 3 PLIP interactions: 3 interactions with chain B Metal complexes: B:D.55, B:T.61, B:E.66 CA.7: 6 residues within 4Å: Chain D: D.19, K.20, D.21, D.23, T.25, E.30 4 PLIP interactions: 4 interactions with chain D Metal complexes: D:D.19, D:T.25, D:E.30, D:E.30 CA.8: 5 residues within 4Å: Chain D: D.55, D.57, N.59, T.61, E.66 3 PLIP interactions: 3 interactions with chain D Metal complexes: D:T.61, D:E.66, D:E.66 CA.9: 5 residues within 4Å: Chain F: D.19, D.21, D.23, T.25, E.30 2 PLIP interactions: 2 interactions with chain F Metal complexes: F:D.19, F:T.25 CA.10: 6 residues within 4Å: Chain F: D.55, D.57, N.59, T.61, D.63, E.66 3 PLIP interactions: 3 interactions with chain F Metal complexes: F:T.61, F:E.66, F:E.66 CA.11: 7 residues within 4Å: Chain H: D.19, K.20, D.21, G.22, D.23, T.25, E.30 5 PLIP interactions: 5 interactions with chain H Metal complexes: H:D.23, H:D.23, H:T.25, H:E.30, H:E.30 CA.12: 5 residues within 4Å: Chain H: D.55, D.57, N.59, T.61, E.66 3 PLIP interactions: 3 interactions with chain H Metal complexes: H:D.55, H:T.61, H:E.66

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: ACEG
Calmodulin-1: BDFH

SMTL:PDB

SMTL Chain Id:
PDB Chain Id:

A
A

C
B

E
C

G
D

B
E

D
F

F
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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