1IGR: Type 1 Insulin-like Growth Factor Receptor (Domains 1-3)

Citation:
Abstract
The type-1 insulin-like growth-factor receptor (IGF-1R) and insulin receptor (IR) are closely related members of the tyrosine-kinase receptor superfamily. IR is essential for glucose homeostasis, whereas IGF-1R is involved in both normal growth and development and malignant transformation. Homologues of these receptors are found in animals as simple as cnidarians. The epidermal growth-factor receptor (EGFR) family is closely related to the IR family and has significant sequence identity to the extracellular portion we describe here. We now present the structure of the first three domains of IGF-IR (L1-Cys-rich-L2) determined to 2.6 A resolution. The L domains each consist of a single-stranded right-handed beta-helix. The Cys-rich region is composed of eight disulphide-bonded modules, seven of which form a rod-shaped domain with modules associated in an unusual manner. The three domains surround a central space of sufficient size to accommodate a ligand molecule. Although the fragment (residues 1-462) does not bind ligand, many of the determinants responsible for hormone binding and ligand specificity map to this central site. This structure therefore shows how the IR subfamily might interact with their ligands.
PDB ID: 1IGRDownload
MMDB ID: 11440
PDB Deposition Date: 1998/9/28
Updated in MMDB: 2012/11 
Experimental Method:
x-ray diffraction
Resolution: 2.6  Å
Source Organism:
Similar Structures:
Biological Unit for 1IGR: monomeric; determined by author
Molecular Components in 1IGR
Label Count Molecule
Protein (1 molecule)
1
Insulin-like Growth Factor Receptor 1
Molecule annotation
Chemicals (18 molecules)
1
6
2
2
3
1
4
1
5
8
* Click molecule labels to explore molecular sequence information.

Citing MMDB
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