SMTL ID : 9y5q.1

Cryo EM structure of KCa3.1_R355K_I/calmodulin channel in complex with rimtuzalcap

Coordinates

PDB Format Compare

Method

ELECTRON MICROSCOPY 4.73 Å

Oligo State

hetero-4-4-mer

Ligands

1 x K: POTASSIUM ION(Non-functional Binders)

K.1: 0 residues within 4Å: (No contacts) 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

01.2: 7 residues within 4Å: Chain A: L.177, Q.179 Chain C: K.347, R.351 Chain E: M.50, K.74, E.86 2 PLIP interactions: 1 interactions with chain A, 1 interactions with chain C Hydrophobic interactions: A:L.177 Hydrogen bonds: C:K.347 01.4: 6 residues within 4Å: Chain B: K.347, R.351 Chain D: Q.179 Chain F: M.50, E.53, K.74 No protein-ligand interaction detected (PLIP) 01.6: 7 residues within 4Å: Chain A: K.347, R.351 Chain C: Q.179 Chain G: M.50, E.53, K.74, R.89 1 PLIP interactions: 1 interactions with chain A Hydrogen bonds: A:K.347 01.8: 7 residues within 4Å: Chain B: Q.179 Chain D: K.347, R.351 Chain H: E.53, K.74, E.86, R.89 1 PLIP interactions: 1 interactions with chain D Hydrogen bonds: D:K.347

4 x CA: CALCIUM ION(Non-covalent)

CA.3: 6 residues within 4Å: Chain E: D.19, D.21, G.22, D.23, G.24, T.25 5 PLIP interactions: 5 interactions with chain E Metal complexes: E:D.19, E:D.19, E:D.21, E:D.21, E:D.23 CA.5: 6 residues within 4Å: Chain F: D.19, D.21, G.22, D.23, G.24, T.25 5 PLIP interactions: 5 interactions with chain F Metal complexes: F:D.19, F:D.19, F:D.21, F:D.21, F:D.23 CA.7: 6 residues within 4Å: Chain G: D.19, D.21, G.22, D.23, G.24, T.25 5 PLIP interactions: 5 interactions with chain G Metal complexes: G:D.19, G:D.19, G:D.21, G:D.21, G:D.23 CA.9: 6 residues within 4Å: Chain H: D.19, D.21, G.22, D.23, G.24, T.25 5 PLIP interactions: 5 interactions with chain H Metal complexes: H:D.19, H:D.19, H:D.21, H:D.21, H:D.23

Links

RCSB   PDBe   PDBe-KB   PDBj   PDBsum   CATH   PLIP

Citation

Nam, Y.W. et al., Structural basis for the subtype-selectivity of KCa2.2 channel activators. To Be Published

Release Date

2025-10-15

Peptides

Intermediate conductance calcium-activated potassium channel protein 4: 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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Intermediate conductance calcium-activated potassium channel protein 4

Calmodulin-1

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