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Structure of the monomeric form of T. gondii SAG1 surface antigen bound to a human Fab

X-ray diffraction
3.1Å resolution
PDB entry 1ynt coloured by chain, front view.
PDB entry 1ynt coloured by chain, side view.
PDB entry 1ynt coloured by chain, top view.
Source organisms:
Assembly composition:
hetero heptamer (preferred)
Entry contents: 4 distinct polypeptide molecules

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Assemblies

Assembly 1 (preferred)
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Multimeric state: hetero heptamer
Accessible surface area: 62424.63 Å2
Buried surface area: 14108.87 Å2
Dissociation area: 1,489.58 Å2
Dissociation energy (ΔGdiss): -12.92 kcal/mol
Dissociation entropy (TΔSdiss): 26.38 kcal/mol
Symmetry number: 1
PDBe Complex ID: PDB-CPX-233285

Macromolecules

4F11E12 Fab variable light chain region
Chains: A, C
Length: 213 amino acids
Theoretical weight: 23.58 KDa
Source organism: Mus musculus
InterPro:
CATH: Immunoglobulins
4F11E12 Fab variable light chain region in PDB entry 1ynt, assembly 1, front view.
4F11E12 Fab variable light chain region in PDB entry 1ynt, assembly 1, side view.
4F11E12 Fab variable light chain region in PDB entry 1ynt, assembly 1, top view.
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4F11E12 Fab variable heavy chain region
Chains: B, D
Length: 218 amino acids
Theoretical weight: 23.57 KDa
Source organism: Mus musculus
InterPro:
CATH: Immunoglobulins
SCOP: C1 set domains (antibody constant domain-like)
4F11E12 Fab variable heavy chain region in PDB entry 1ynt, assembly 1, front view.
4F11E12 Fab variable heavy chain region in PDB entry 1ynt, assembly 1, side view.
4F11E12 Fab variable heavy chain region in PDB entry 1ynt, assembly 1, top view.
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Gram-positive cocci surface proteins LPxTG domain-containing protein
Chain: E
Length: 61 amino acids
Theoretical weight: 6.75 KDa
Source organism: Finegoldia magna ATCC 29328
Expression system: Escherichia coli
UniProt:
  • Canonical: Q51918 (Residues: 476-536; Coverage: 6%)
Pfam: Protein L b1 domain
InterPro: Protein L, Ig light chain-binding
CATH: Ubiquitin-like (UB roll)
SCOP: Immunoglobulin-binding domains
Gram-positive cocci surface proteins LPxTG domain-containing protein in PDB entry 1ynt, assembly 1, front view.
Gram-positive cocci surface proteins LPxTG domain-containing protein in PDB entry 1ynt, assembly 1, side view.
Gram-positive cocci surface proteins LPxTG domain-containing protein in PDB entry 1ynt, assembly 1, top view.
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Major surface antigen p30
Chains: F, G
Length: 254 amino acids
Theoretical weight: 26.64 KDa
Source organism: Toxoplasma gondii
Expression system: Komagataella pastoris
UniProt:
  • Canonical: P13664 (Residues: 50-303; Coverage: 88%)
Pfam: SRS domain
InterPro:
CATH: SRS domain
SCOP: Major surface antigen p30, SAG1
Major surface antigen p30 in PDB entry 1ynt, assembly 1, front view.
Major surface antigen p30 in PDB entry 1ynt, assembly 1, side view.
Major surface antigen p30 in PDB entry 1ynt, assembly 1, top view.
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