Structure analysis

Structure of S. aureus protein A bound to a human IgM Fab

X-ray diffraction
2.7Å resolution
Assemblies composition:
hetero dimer
hetero trimer (preferred)
Entry contents: 3 distinct polypeptide molecules

Assemblies

Assembly 1
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Multimeric state: hetero dimer
Accessible surface area: 19000 Å2
Buried surface area: 3800 Å2
Dissociation area: 1,900 Å2
Dissociation energy (ΔGdiss): 15 kcal/mol
Dissociation entropy (TΔSdiss): 13 kcal/mol
Interface energy (ΔGint): -20 kcal/mol
Symmetry number: 1
Assembly 2 (preferred)
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Multimeric state: hetero trimer

Binding statistics and energies are not available for this assembly
Assembly 3
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Multimeric state: hetero trimer

Binding statistics and energies are not available for this assembly
Assembly 4
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Multimeric state: hetero dimer

Binding statistics and energies are not available for this assembly
Assembly 5
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Multimeric state: hetero dimer

Binding statistics and energies are not available for this assembly

Macromolecules

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Chains: G, H
Length: 54 amino acids
Theoretical weight: 6.1 KDa
Source organism: Staphylococcus aureus
Expression system: Staphylococcus aureus
UniProt:
  • Canonical: P02976 (Residues: 100-153; Coverage: 11%)
Gene names: SAOUHSC_00069, spa
InterPro:
CATH: Immunoglobulin FC, subunit C
SCOP: Immunoglobulin-binding protein A modules

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