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Crystal structure of a small conductance potassium channel splice variant complexed with calcium-calmodulin

X-ray diffraction
1.9Å resolution
PDB entry 3sjq coloured by chain, front view.
PDB entry 3sjq coloured by chain, side view.
PDB entry 3sjq coloured by chain, top view.
Source organism: Rattus norvegicus
Assembly composition:
hetero tetramer (preferred)
Entry contents: 2 distinct polypeptide molecules

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Assemblies

Assembly 1 (preferred)
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Assembly Name: Calmodulin-1 and Small conductance calcium-activated potassium channel protein 2
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Multimeric state: hetero tetramer
Accessible surface area: 25783.78 Å2
Buried surface area: 10987.65 Å2
Dissociation area: 1,918.55 Å2
Dissociation energy (ΔGdiss): 24.18 kcal/mol
Dissociation entropy (TΔSdiss): 13.98 kcal/mol
Symmetry number: 2
PDBe Complex ID: PDB-CPX-144036

Macromolecules

Calmodulin-1
Chains: A, B
Length: 149 amino acids
Theoretical weight: 16.85 KDa
Source organism: Rattus norvegicus
Expression system: Escherichia coli
UniProt:
  • Canonical: P0DP29 (Residues: 1-149; Coverage: 100%)
Gene names: CaMI, Calm, Calm1, Cam, Cam1
Pfam: EF-hand domain pair
InterPro:
Calmodulin-1 in PDB entry 3sjq, assembly 1, front view.
Calmodulin-1 in PDB entry 3sjq, assembly 1, side view.
Calmodulin-1 in PDB entry 3sjq, assembly 1, top view.
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Small conductance calcium-activated potassium channel protein 2
Chains: C, D
Length: 87 amino acids
Theoretical weight: 10.44 KDa
Source organism: Rattus norvegicus
Expression system: Escherichia coli
UniProt:
  • Canonical: P70604 (Residues: 412-462, 463-487; Coverage: 13%)
Gene name: Kcnn2
Pfam: Calmodulin binding domain
InterPro:
CATH: Helix Hairpins
Small conductance calcium-activated potassium channel protein 2 in PDB entry 3sjq, assembly 1, front view.
Small conductance calcium-activated potassium channel protein 2 in PDB entry 3sjq, assembly 1, side view.
Small conductance calcium-activated potassium channel protein 2 in PDB entry 3sjq, assembly 1, top view.
Molecule details ›

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