Macromolecule Content

• Total Structure Weight: 13354.97 
• Atom Count: 942 
• Residue Count: 117 
• Unique protein chains: 2

2ETZ

The NMR minimized average structure of the Itk SH2 domain bound to a phosphopeptide

• DOI: 10.2210/pdb2ETZ/pdb

• Classification: TRANSFERASE
• Organism(s): Mus musculus
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 2005-10-27 Released: 2006-02-07 
• Deposition Author(s): Sundd, M., Pletneva, E.V., Fulton, D.B., Andreotti, A.H.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 1 
• Selection Criteria: Average structure 

Literature

Molecular Details of Itk Activation by Prolyl Isomerization and Phospholigand Binding: The NMR Structure of the Itk SH2 Domain Bound to a Phosphopeptide.

Pletneva, E.V., Sundd, M., Fulton, D.B., Andreotti, A.H.

(2006) J.Mol.Biol. 357: 550-561

• PubMed: 16436281 
• DOI: 10.1016/j.jmb.2005.12.073
• Primary Citation of Related Structures:  
  2EU0


• PubMed Abstract: 
  

The Src homology 2 (SH2) domain of interleukin-2 tyrosine kinase (Itk) is a critical component of the regulatory apparatus controlling the activity of this immunologically important enzyme. To gain insight into the structural features associated with the activated form of Itk, we have solved the NMR structure of the SH2 domain bound to a phosphotyrosine-containing peptide (pY) and analyzed changes in trans-hydrogen bond scalar couplings ((3h)J(NC')) that result from pY binding. Isomerization of a single prolyl imide bond in this domain is responsible for simultaneous existence of two distinct SH2 conformers. Prolyl isomerization directs ligand recognition: the trans conformer preferentially binds pY. The structure of the SH2/pY complex provides insight into the ligand specificity; the BG loop in the ligand-free trans SH2 conformer is pre-arranged for optimal contacts with the pY+3 residue of the ligand. Analysis of (3h)J(NC') couplings arising from hydrogen bonds has revealed propagation of structural changes from the pY binding pocket to the CD loop containing conformationally heterogeneous proline as well as to the alphaB helix, on the opposite site of the domain. These findings offer a structural framework for understanding the roles of prolyl isomerization and pY binding in Itk regulation.

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Related Citations: 

• Structural characterization of a proline-driven conformational switch within the Itk SH2 domain.
  Mallis, R.J.,Brazin, K.N.,Fulton, D.B.,Andreotti, A.H.
  (2002) Nat.Struct.Mol.Biol. 9: 900




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Organizational Affiliation: 

Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA 50011, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Tyrosine-protein kinase ITK/TSK	A	109	Mus musculus	Mutation(s): 0  Gene Names: Itk (Emt, Tlk, Tsk) EC: 2.7.10.2
Find proteins for Q03526 (Mus musculus) Go to UniProtKB:  Q03526

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Lymphocyte cytosolic protein 2 phosphopeptide fragment	B	8	Mus musculus	Mutation(s): 0  Gene Names: Lcp2
Find proteins for Q60787 (Mus musculus) Go to UniProtKB:  Q60787

Small Molecules

Modified Residues  3 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
NH2	B	NON-POLYMER	H2 N		--
PTR	B	L-PEPTIDE LINKING	C9 H12 N O6 P		TYR
ACE	A, B	NON-POLYMER	C2 H4 O		--

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 1 
• Selection Criteria: Average structure 

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-10-27 
• Released Date: 2006-02-07 
• Deposition Author(s): Sundd, M., Pletneva, E.V., Fulton, D.B., Andreotti, A.H.

Revision History 

• Version 1.0: 2006-02-07
  Type: Initial release
• Version 1.1: 2008-05-01
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance