1MCO image
Deposition Date 1993-02-25
Release Date 1994-01-31
Last Version Date 2024-12-25
Entry Detail
PDB ID:
1MCO
Keywords:
IMMUNOGLOBULIN
Title:
THREE-DIMENSIONAL STRUCTURE OF A HUMAN IMMUNOGLOBULIN WITH A HINGE DELETION
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
3.20 Å
R-Value Work:
0.23
R-Value Observed:
0.23
Space Group:
C 2 2 21
1MCO validation report
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:IGG1 MCG INTACT ANTIBODY (HEAVY CHAIN)
Chain IDs:B (auth: H)
Chain Length:428
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:IGG1 MCG INTACT ANTIBODY (LIGHT CHAIN)
Chain IDs:A (auth: L)
Chain Length:216
Number of Molecules:1
Biological Source:Homo sapiens
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ASN B ASN GLYCOSYLATION SITE
Ligand Molecules
NA
Primary Citation
Three-dimensional structure of a human immunoglobulin with a hinge deletion.
Proc.Natl.Acad.Sci.Usa 90 4271 4275 (1993)
PMID: 8483943 DOI: 10.1073/pnas.90.9.4271

Abstact

X-ray analysis at 3.2-A resolution revealed that the Mcg IgG1 (lambda chain) immunoglobulin is a compact T-shaped molecule. Because of the hinge deletion, the Fc fragment lobe is pulled tightly upward into the junction of the Fab arms. Along the molecular twofold axis, the Fab arms are joined by an interchain disulfide bond between the two light chains. The antigen combining sites consist of large irregular cavities at the tips of the Fab regions. Potential complement (C1q) binding sites on Fc are sterically shielded by the Fab arms, but putative attachment sites are accessible for docking with the FcRI receptor on human monocytes and with protein A of Staphylococcus aureus.

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Primary Citation of related structures
1MCO