Structure analysis

Crystal Structure of Staphylococcal Enterotoxin I (SEI) in Complex with a Human MHC class II Molecule

X-ray diffraction
2Å resolution
Assembly composition:
hetero tetramer (preferred)
Entry contents: 4 distinct polypeptide molecules


Assembly 1 (preferred)
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Multimeric state: hetero tetramer
Accessible surface area: 27500 Å2
Buried surface area: 10100 Å2
Dissociation area: 1,400 Å2
Dissociation energy (ΔGdiss): 23 kcal/mol
Dissociation entropy (TΔSdiss): 9 kcal/mol
Interface energy (ΔGint): -121 kcal/mol
Symmetry number: 1


Chain: C
Length: 13 amino acids
Theoretical weight: 1.51 KDa
Source organism: Influenza A virus (A/England/878/1969(H3N2))
Expression system: Not provided
  • Canonical: P04664 (Residues: 306-318; Coverage: 4%)
Gene name: HA

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