1K3A

Structure of the Insulin-like Growth Factor 1 Receptor Kinase

Summary for 1K3A

• Entry DOI: 10.2210/pdb1k3a/pdb
• Descriptor: insulin-like growth factor 1 receptor, insulin receptor substrate 1, PHOSPHOMETHYLPHOSPHONIC ACID ADENYLATE ESTER, ... (4 entities in total)
• Functional Keywords: protein kinase, tyrosine kinase, tyrosine phosphorylation, protein-substrate complex, transferase
• Biological source: Homo sapiens (human); More
• Cellular location: Membrane; Single-pass type I membrane protein: P08069
• Total number of polymer chains: 2
• Total formula weight: 36514.22

Authors

Favelyukis, S.,Till, J.H.,Hubbard, S.R.,Miller, W.T. (deposition date: 2001-10-02, release date: 2001-11-28, Last modification date: 2024-10-09)

Primary citation

Favelyukis, S.,Till, J.H.,Hubbard, S.R.,Miller, W.T.
Structure and autoregulation of the insulin-like growth factor 1 receptor kinase.
Nat.Struct.Biol., 8:1058-1063, 2001

PubMed Abstract: The insulin-like growth factor 1 (IGF1) receptor is closely related to the insulin receptor. However, the unique biological functions of IGF1 receptor make it a target for therapeutic intervention in human cancer. Using its isolated tyrosine kinase domain, we show that the IGF1 receptor is regulated by intermolecular autophosphorylation at three sites within the kinase activation loop. Steady-state kinetic analyses of the isolated phosphorylated forms of the IGF1 receptor kinase (IGF1RK) reveal that each autophosphorylation event increases enzyme turnover number and decreases Km for ATP and peptide. We have determined the 2.1 A-resolution crystal structure of the tris-phosphorylated form of IGF1RK in complex with an ATP analog and a specific peptide substrate. The structure of IGF1RK reveals how the enzyme recognizes peptides containing hydrophobic residues at the P+1 and P+3 positions and how autophosphorylation stabilizes the activation loop in a conformation that facilitates catalysis. Although the nucleotide binding cleft is conserved between IGF1RK and the insulin receptor kinase, sequence differences in the nearby interlobe linker could potentially be exploited for anticancer drug design.

PubMed: 11694888
DOI: 10.1038/nsb721

Experimental method

X-RAY DIFFRACTION (2.1 Å)