SMTL ID : 9o7s.1

Cryo-EM structure of KCa2.2/calmodulin channel in complex with NS309

Coordinates

PDB Format Compare

Method

ELECTRON MICROSCOPY 2.71 Å

Oligo State

hetero-4-4-mer

Ligands

3 x K: POTASSIUM ION(Non-covalent)(Non-functional Binders)

K.1: 5 residues within 4Å: Chain A: S.242 Chain B: S.242 Chain C: S.242 Chain D: S.242 Ligands: K.2 5 PLIP interactions: 1 interactions with chain D, 2 interactions with chain B, 1 interactions with chain A, 1 interactions with chain C Metal complexes: D:S.242, B:S.242, B:S.242, A:S.242, C:S.242 K.2: 9 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 Ligands: K.1 5 PLIP interactions: 2 interactions with chain D, 1 interactions with chain B, 1 interactions with chain C, 1 interactions with chain A Metal complexes: D:S.242, D:I.243, B:I.243, C:I.243, A:I.243 K.3: 0 residues within 4Å: (No contacts) No protein-ligand interaction detected (PLIP)

4 x 1KP: (3E)-6,7-dichloro-3-(hydroxyimino)-1,3-dihydro-2H-indol-2-one(Non-covalent)

1KP.4: 11 residues within 4Å: Chain C: S.171, A.174, L.175 Chain E: F.17, I.25, L.30, M.49, I.61, F.66, M.69, K.73 2 PLIP interactions: 2 interactions with chain E Hydrophobic interactions: E:L.30 Hydrogen bonds: E:K.73 1KP.7: 11 residues within 4Å: Chain D: S.171, A.174, L.175 Chain F: F.17, I.25, L.30, M.49, I.61, F.66, M.69, K.73 2 PLIP interactions: 2 interactions with chain F Hydrophobic interactions: F:L.30 Hydrogen bonds: F:K.73 1KP.10: 12 residues within 4Å: Chain A: S.171, A.174, L.175 Chain G: F.17, I.25, L.30, M.49, I.50, I.61, F.66, M.69, K.73 2 PLIP interactions: 2 interactions with chain G Hydrophobic interactions: G:L.30 Hydrogen bonds: G:K.73 1KP.13: 12 residues within 4Å: Chain B: S.171, A.174, L.175 Chain H: F.17, I.25, L.30, M.49, I.50, I.61, F.66, M.69, K.73 2 PLIP interactions: 2 interactions with chain H Hydrophobic interactions: H:L.30 Hydrogen bonds: H:K.73

8 x CA: CALCIUM ION(Non-covalent)

CA.5: 4 residues within 4Å: Chain E: D.18, D.20, T.24, E.29 5 PLIP interactions: 5 interactions with chain E Metal complexes: E:D.18, E:D.20, E:D.20, E:T.24, E:E.29 CA.6: 6 residues within 4Å: Chain E: D.54, D.56, N.58, T.60, D.62, E.65 5 PLIP interactions: 5 interactions with chain E Metal complexes: E:D.54, E:D.56, E:T.60, E:D.62, E:E.65 CA.8: 5 residues within 4Å: Chain F: D.18, D.20, D.22, T.24, E.29 5 PLIP interactions: 5 interactions with chain F Metal complexes: F:D.18, F:D.20, F:D.22, F:T.24, F:E.29 CA.9: 6 residues within 4Å: Chain F: D.54, D.56, N.58, T.60, D.62, E.65 5 PLIP interactions: 5 interactions with chain F Metal complexes: F:D.54, F:D.56, F:T.60, F:D.62, F:E.65 CA.11: 5 residues within 4Å: Chain G: D.18, D.20, D.22, T.24, E.29 5 PLIP interactions: 5 interactions with chain G Metal complexes: G:D.20, G:D.22, G:T.24, G:E.29, G:E.29 CA.12: 7 residues within 4Å: Chain G: D.54, A.55, D.56, G.57, T.60, D.62, E.65 5 PLIP interactions: 5 interactions with chain G Metal complexes: G:D.54, G:D.56, G:T.60, G:D.62, G:D.62 CA.14: 7 residues within 4Å: Chain H: D.18, D.20, D.22, T.24, I.25, T.26, E.29 5 PLIP interactions: 5 interactions with chain H Metal complexes: H:D.18, H:D.22, H:T.24, H:E.29, H:E.29 CA.15: 5 residues within 4Å: Chain H: D.54, D.56, T.60, D.62, E.65 5 PLIP interactions: 5 interactions with chain H Metal complexes: H:D.56, H:T.60, H:D.62, H:E.65, H:E.65

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.
Show / Hide

Small conductance calcium-activated potassium channel protein 2

Calmodulin-1

Related Entries With Identical Sequence