8FAB

CRYSTAL STRUCTURE OF THE FAB FRAGMENT FROM THE HUMAN MYELOMA IMMUNOGLOBULIN IGG HIL AT 1.8 ANGSTROMS RESOLUTION

DOI: 10.2210/pdb8FAB/pdb

Classification: IMMUNOGLOBULIN
Organism(s): Homo sapiens
Mutation(s): No

Deposited: 1992-03-23 Released: 1993-10-31
Deposition Author(s): Saul, F.A., Poljak, R.J.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.80 Å
R-Value Work: 0.173
R-Value Observed: 0.173

wwPDB Validation 3D Report Full Report

This is version 1.2 of the entry. See complete history.

Literature

Three-dimensional structure of murine anti-p-azophenylarsonate Fab 36-71. 1. X-ray crystallography, site-directed mutagenesis, and modeling of the complex with hapten.

Strong, R.K., Campbell, R., Rose, D.R., Petsko, G.A., Sharon, J., Margolies, M.N.

(1991) Biochemistry 30: 3739-3748

PubMed: 2015229 Search on PubMed
DOI: 10.1021/bi00229a022
Primary Citation of Related Structures:
8FAB, 6FAB

PubMed Abstract:

The structure of the antigen-binding fragment (Fab) of an anti-p-azophenylarsonate monoclonal antibody, 36-71, bearing a major cross-reactive idiotype of A/J mice has been refined to an R factor of 24.8% at a resolution of 1.85 A. The previously solved partial structure of this Fab at a resolution of 2.9 A (Rose et al., 1990) was used as an initial model for refinement against the high-resolution data. The complex with hapten has been modeled by docking the small-molecule crystal structure of phenylarsonic acid into the structure of the native Fab on the basis of a low-resolution electron density map of the complex. In this model, residue Arg-96 in the light chain and residues Asn-35, Trp-47, and Ser-99 in the heavy chain contact the arsonate moiety of the hapten; an additional bond is found between the arsonate group and a tightly bound water molecule. The phenyl moiety of the hapten packs against two tyrosine side chains at positions 50 and 106 in the heavy chain. Residue Arg-96 in the light chain had been implicated as involved in hapten binding on the basis of previous experiments, and indeed, this residue appears to play a crucial role in this model. Experiments employing site-directed mutagenesis directly support this conclusion. The heavy-chain complementarity-determining regions have novel conformations not previously observed in immunoglobulins except for the recently solved anti-p-azophenylarsonate Fab R 19.9 (Lascombe et al., 1989).

Related Citations:

Amino Acid Sequence of the VH Region of Human Myeloma Cryoimmunoglobulin Igg Hil
Chiu, Y.-Y.H., Lopez De Castro, J.A., Poljak, R.J.
(1979) Biochemistry 18: 553

Amino Acid Sequence of the Variable Region of the Light (Lambda) Chain from Human Myeloma Cryoimmunoglobulin Igg Hil
Lopez De Castro, J.A., Chiu, Y.-Y.H., Poljak, R.J.
(1978) Biochemistry 17: 1718

Crystals of Fragment Fab': Preparation from Pepsin Digests of Human Igg Myeloma Proteins
Rossi, G., Choi, T.K., Nisonoff, A.
(1969) Nature 223: 837

Organizational Affiliation:

California Institute of Technology, Pasadena 91125.

Macromolecules

Find similar proteins by:

(by identity cutoff) | Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
IGG1-LAMBDA HIL FAB (LIGHT CHAIN)	A, C	212	Homo sapiens	Mutation(s): 0
Protein Feature View Expand
Reference Sequence

Find similar proteins by:

(by identity cutoff) | Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
IGG1-LAMBDA HIL FAB (HEAVY CHAIN)	B, D	224	Homo sapiens	Mutation(s): 0
Protein Feature View Expand
Reference Sequence