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Mechanisms of Opening and Closing of the Bacterial Replicative Helicase: The DnaB Helicase and Lambda P Helicase Loader Complex

Electron Microscopy
4.1Å resolution
PDB entry 6bbm coloured by chain, front view.
PDB entry 6bbm coloured by chain, side view.
PDB entry 6bbm coloured by chain, top view.
Source organisms:
Assembly composition:
hetero undecamer (preferred)
Entry contents: 2 distinct polypeptide molecules

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Assemblies

Assembly 1 (preferred)
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Assembly Name: dnaB helicase complex and Replication protein P
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Multimeric state: hetero undecamer
Accessible surface area: 110460.77 Å2
Buried surface area: 38772.56 Å2
Dissociation area: 4,002.33 Å2
Dissociation energy (ΔGdiss): 31.55 kcal/mol
Dissociation entropy (TΔSdiss): 16.24 kcal/mol
Symmetry number: 1
PDBe Complex ID: PDB-CPX-137200

Macromolecules

Replicative DNA helicase
Chains: A, B, C, D, E, F
Length: 471 amino acids
Theoretical weight: 52.45 KDa
Source organism: Escherichia coli O111:NM
Expression system: Escherichia coli BL21(DE3)
UniProt:
  • Canonical: P0ACB0 (Residues: 1-471; Coverage: 100%)
Gene names: JW4012, b4052, dnaB, groP, grpA
Pfam:
InterPro:
Replicative DNA helicase in PDB entry 6bbm, assembly 1, front view.
Replicative DNA helicase in PDB entry 6bbm, assembly 1, side view.
Replicative DNA helicase in PDB entry 6bbm, assembly 1, top view.
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Replication protein P
Chains: V, W, X, Y, Z
Length: 233 amino acids
Theoretical weight: 23.14 KDa
Source organism: Lambdavirus lambda
Expression system: Escherichia coli BL21(DE3)
UniProt:
  • Canonical: P03689 (Residues: 1-107; Coverage: 46%)
Gene name: P
Pfam: Replication protein P
InterPro: Replication P
Replication protein P in PDB entry 6bbm, assembly 1, front view.
Replication protein P in PDB entry 6bbm, assembly 1, side view.
Replication protein P in PDB entry 6bbm, assembly 1, top view.
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