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1.60 A CRYSTAL STRUCTURE OF THE GATING DOMAIN FROM SMALL CONDUCTANCE POTASSIUM CHANNEL COMPLEXED WITH CALCIUM-CALMODULIN

X-ray diffraction
1.6Å resolution
PDB entry 1g4y coloured by chain, front view.
PDB entry 1g4y coloured by chain, side view.
PDB entry 1g4y 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: 23089.47 Å2
Buried surface area: 12331.58 Å2
Dissociation area: 3,553.74 Å2
Dissociation energy (ΔGdiss): 46.93 kcal/mol
Dissociation entropy (TΔSdiss): 13.98 kcal/mol
Symmetry number: 2
PDBe Complex ID: PDB-CPX-144036

Macromolecules

Small conductance calcium-activated potassium channel protein 2
Chain: B
Length: 101 amino acids
Theoretical weight: 12.11 KDa
Source organism: Rattus norvegicus
Expression system: Escherichia coli BL21(DE3)
UniProt:
  • Canonical: P70604 (Residues: 396-487; Coverage: 16%)
Gene name: Kcnn2
Pfam: Calmodulin binding domain
InterPro:
CATH: Helix Hairpins
SCOP: Small-conductance potassium channel
Small conductance calcium-activated potassium channel protein 2 in PDB entry 1g4y, assembly 1, front view.
Small conductance calcium-activated potassium channel protein 2 in PDB entry 1g4y, assembly 1, side view.
Small conductance calcium-activated potassium channel protein 2 in PDB entry 1g4y, assembly 1, top view.
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Calmodulin-1
Chain: R
Length: 148 amino acids
Theoretical weight: 16.72 KDa
Source organism: Rattus norvegicus
Expression system: Escherichia coli BL21(DE3)
UniProt:
  • Canonical: P0DP29 (Residues: 2-149; Coverage: 99%)
Gene names: CaMI, Calm, Calm1, Cam, Cam1
Pfam: EF-hand domain pair
InterPro:
CATH: EF-hand
SCOP: Calmodulin-like
Calmodulin-1 in PDB entry 1g4y, assembly 1, front view.
Calmodulin-1 in PDB entry 1g4y, assembly 1, side view.
Calmodulin-1 in PDB entry 1g4y, assembly 1, top view.
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