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Cryo-EM structure of the KdpFABC complex in a nucleotide-free E1 conformation loaded with K+

Electron Microscopy
3.4Å resolution
PDB entry 7zrh coloured by chain, front view.
PDB entry 7zrh coloured by chain, side view.
PDB entry 7zrh coloured by chain, top view.
Source organism: Escherichia coli
Assembly composition:
hetero tetramer (preferred)
Entry contents: 4 distinct polypeptide molecules

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Assemblies

Assembly 1 (preferred)
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Assembly Name: KdpFABC potassium import complex
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Multimeric state: hetero tetramer
Accessible surface area: 48930.16 Å2
Buried surface area: 20208.05 Å2
Dissociation area: 1,046.01 Å2
Dissociation energy (ΔGdiss): 18.65 kcal/mol
Dissociation entropy (TΔSdiss): 9.57 kcal/mol
Symmetry number: 1
PDBe Complex ID: PDB-CPX-137301
Complex Portal ID: CPX-3564

Macromolecules

Potassium-transporting ATPase potassium-binding subunit
Chain: A
Length: 557 amino acids
Theoretical weight: 59.22 KDa
Source organism: Escherichia coli
Expression system: Escherichia coli
UniProt:
  • Canonical: P03959 (Residues: 1-557; Coverage: 100%)
Gene names: JW0686, b0698, kdpA
Pfam: Potassium-transporting ATPase A subunit
InterPro: Potassium-transporting ATPase A chain
Potassium-transporting ATPase potassium-binding subunit in PDB entry 7zrh, assembly 1, front view.
Potassium-transporting ATPase potassium-binding subunit in PDB entry 7zrh, assembly 1, side view.
Potassium-transporting ATPase potassium-binding subunit in PDB entry 7zrh, assembly 1, top view.
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Potassium-transporting ATPase KdpC subunit
Chain: C
Length: 190 amino acids
Theoretical weight: 20.28 KDa
Source organism: Escherichia coli
Expression system: Escherichia coli
UniProt:
  • Canonical: P03961 (Residues: 1-190; Coverage: 100%)
Gene names: JW0684, b0696, kdpC
Pfam: K+-transporting ATPase, c chain
InterPro: Potassium-transporting ATPase C chain
Potassium-transporting ATPase KdpC subunit in PDB entry 7zrh, assembly 1, front view.
Potassium-transporting ATPase KdpC subunit in PDB entry 7zrh, assembly 1, side view.
Potassium-transporting ATPase KdpC subunit in PDB entry 7zrh, assembly 1, top view.
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Potassium-transporting ATPase KdpF subunit
Chain: D
Length: 27 amino acids
Theoretical weight: 2.85 KDa
Source organism: Escherichia coli
Expression system: Escherichia coli
UniProt:
  • Canonical: P36937 (Residues: 1-27; Coverage: 93%)
Gene names: JW0687, b4513, kdpF
Pfam: F subunit of K+-transporting ATPase (Potass_KdpF)
InterPro: K+ transporting P-type ATPase, F subunit
Potassium-transporting ATPase KdpF subunit in PDB entry 7zrh, assembly 1, front view.
Potassium-transporting ATPase KdpF subunit in PDB entry 7zrh, assembly 1, side view.
Potassium-transporting ATPase KdpF subunit in PDB entry 7zrh, assembly 1, top view.
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Potassium-transporting ATPase ATP-binding subunit
Chain: B
Length: 682 amino acids
Theoretical weight: 72.35 KDa
Source organism: Escherichia coli
Expression system: Escherichia coli
UniProt:
  • Canonical: P03960 (Residues: 1-682; Coverage: 100%)
Gene names: JW0685, b0697, kdpB
Pfam:
InterPro:
Potassium-transporting ATPase ATP-binding subunit in PDB entry 7zrh, assembly 1, front view.
Potassium-transporting ATPase ATP-binding subunit in PDB entry 7zrh, assembly 1, side view.
Potassium-transporting ATPase ATP-binding subunit in PDB entry 7zrh, assembly 1, top view.
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