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Substrate binding, deprotonation and selectivity at the periplasmic entrance of the E. coli ammonia channel AmtB

X-ray diffraction
2Å resolution
PDB entry 3c1j coloured by chain, front view.
PDB entry 3c1j coloured by chain, side view.
PDB entry 3c1j coloured by chain, top view.
Source organism: Escherichia coli
Assembly composition:
homo trimer (preferred)
Entry contents: 1 distinct polypeptide molecule

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Assemblies

Assembly 1 (preferred)
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Assembly Name: Ammonium transporter AmtB
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Multimeric state: homo trimer
Accessible surface area: 32062.23 Å2
Buried surface area: 12232.14 Å2
Dissociation area: 5,015.02 Å2
Dissociation energy (ΔGdiss): 119.19 kcal/mol
Dissociation entropy (TΔSdiss): 28.76 kcal/mol
Symmetry number: 3
PDBe Complex ID: PDB-CPX-159623

Macromolecules

Ammonium transporter AmtB
Chain: A
Length: 424 amino acids
Theoretical weight: 44.3 KDa
Source organism: Escherichia coli
Expression system: Escherichia coli
UniProt:
  • Canonical: P69681 (Residues: 23-428; Coverage: 100%)
Gene names: JW0441, amtB, b0451, ybaG
Pfam: Ammonium Transporter Family
InterPro:
CATH: Ammonium transporter AmtB like domains
Ammonium transporter AmtB in PDB entry 3c1j, assembly 1, front view.
Ammonium transporter AmtB in PDB entry 3c1j, assembly 1, side view.
Ammonium transporter AmtB in PDB entry 3c1j, assembly 1, top view.
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