SMTL ID : 9o93.1

Cryo-EM structure of KCa2.2_II/calmodulin channel in complex with rimtuzalcap

Coordinates

PDB Format Compare

Method

ELECTRON MICROSCOPY 2.96 Å

Oligo State

hetero-4-4-mer

Ligands

2 x K: POTASSIUM ION(Non-covalent)

K.1: 5 residues within 4Å: Chain A: S.239 Chain B: S.239 Chain C: S.239 Chain D: S.239 Ligands: K.2 4 PLIP interactions: 1 interactions with chain D, 1 interactions with chain C, 1 interactions with chain B, 1 interactions with chain A Metal complexes: D:S.239, C:S.239, B:S.239, A:S.239 K.2: 5 residues within 4Å: Chain A: S.239 Chain B: S.239 Chain C: S.239 Chain D: S.239 Ligands: K.1 No protein-ligand interaction detected (PLIP)

4 x 01: N-(4,4-difluorocyclohexyl)-2-(3-methyl-1H-pyrazol-1-yl)-6-(morpholin-4-yl)pyrimidin-4-amine

01.3: 7 residues within 4Å: Chain A: N.173 Chain D: H.286 Chain G: L.36, Q.38, M.48, V.52, M.68 3 PLIP interactions: 2 interactions with chain G, 1 interactions with chain A Hydrophobic interactions: G:L.36, G:V.52 Hydrogen bonds: A:N.173 01.4: 6 residues within 4Å: Chain B: H.286 Chain C: N.173 Chain E: F.16, L.29, M.48, F.65 2 PLIP interactions: 1 interactions with chain E, 1 interactions with chain C Hydrophobic interactions: E:L.29 Hydrogen bonds: C:N.173 01.5: 10 residues within 4Å: Chain C: H.286 Chain D: L.172, N.173 Chain F: L.29, L.36, Q.38, M.48, I.60, F.65, M.68 2 PLIP interactions: 1 interactions with chain F, 1 interactions with chain D Hydrophobic interactions: F:L.29 Hydrogen bonds: D:N.173 01.6: 8 residues within 4Å: Chain A: H.286 Chain B: N.173 Chain H: M.33, L.36, M.48, V.52, F.65, M.68 2 PLIP interactions: 1 interactions with chain H, 1 interactions with chain B Hydrophobic interactions: H:V.52 Hydrogen bonds: B:N.173

Links

RCSB   PDBe   PDBe-KB   PDBj   PDBsum   CATH   PLIP

Citation

Zhang, M. et al., Structural basis for the subtype-selectivity of KCa2.2 channel activators. Res Sq (2025)

Release Date

2025-06-18

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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