Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 35278.31 
• Atom Count: 2237 
• Residue Count: 306 
• Unique protein chains: 1

1I44

CRYSTALLOGRAPHIC STUDIES OF AN ACTIVATION LOOP MUTANT OF THE INSULIN RECEPTOR TYROSINE KINASE

• DOI: 10.2210/pdb1I44/pdb

• Classification: TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Spodoptera frugiperda
• Mutation(s): 3 


• Deposited: 2001-02-19 Released: 2001-03-07 
• Deposition Author(s): Till, J.H., Ablooglu, A.J., Frankel, M., Kohanski, R.A., Hubbard, S.R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.4 Å
• R-Value Free: 0.268 
• R-Value Work: 0.210 

Literature

Crystallographic and solution studies of an activation loop mutant of the insulin receptor tyrosine kinase: insights into kinase mechanism.

Till, J.H., Ablooglu, A.J., Frankel, M., Bishop, S.M., Kohanski, R.A., Hubbard, S.R.

(2001) J.Biol.Chem. 276: 10049-10055

• PubMed: 11124964 
• DOI: 10.1074/jbc.M010161200


• PubMed Abstract: 
  

The tyrosine kinase domain of the insulin receptor is subject to autoinhibition in the unphosphorylated basal state via steric interactions involving the activation loop. A mutation in the activation loop designed to relieve autoinhibition, Asp-1161 --> Ala, substantially increases the ability of the unphosphorylated kinase to bind ATP. The crystal structure of this mutant in complex with an ATP analog has been determined at 2.4-A resolution. The structure shows that the active site is unobstructed, but the end of the activation loop is disordered and therefore the binding site for peptide substrates is not fully formed. In addition, Phe-1151 of the protein kinase-conserved DFG motif, at the beginning of the activation loop, hinders closure of the catalytic cleft and proper positioning of alpha-helix C for catalysis. These results, together with viscometric kinetic measurements, suggest that peptide substrate binding induces a reconfiguration of the unphosphorylated activation loop prior to the catalytic step. The crystallographic and solution studies provide new insights into the mechanism by which the activation loop controls phosphoryl transfer as catalyzed by the insulin receptor.

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Organizational Affiliation: 

Skirball Institute of Biomolecular Medicine and Department of Pharmacology, New York University School of Medicine, New York, New York 10016, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
INSULIN RECEPTOR	A	306	Homo sapiens	Mutation(s): 3  Gene Names: INSR EC: 2.7.10.1
Find proteins for P06213 (Homo sapiens) Go to Gene View: INSR Go to UniProtKB:  P06213

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
MG	A	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N
ACP	A	PHOSPHOMETHYLPHOSPHONIC ACID ADENYLATE ESTER ADENOSINE-5'-[BETA, GAMMA-METHYLENE]TRIPHOSPHATE C11 H18 N5 O12 P3 UFZTZBNSLXELAL-IOSLPCCCSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.4 Å
• R-Value Free: 0.268 
• R-Value Work: 0.210 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 57.857	α = 90.00
b = 69.578	β = 90.00
c = 89.260	γ = 90.00

Software Package:

Software Name	Purpose
AMoRE	phasing
DENZO	data reduction
SCALEPACK	data scaling
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2001-02-19 
• Released Date: 2001-03-07 
• Deposition Author(s): Till, J.H., Ablooglu, A.J., Frankel, M., Kohanski, R.A., Hubbard, S.R.

Revision History 

• Version 1.0: 2001-03-07
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance