2ETZ

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


Experimental Data Snapshot

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

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

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

  • DOI: 10.1016/j.jmb.2005.12.073
  • Primary Citation of Related Structures:  

  • 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 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.


    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


    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
MoleculeChainsSequence LengthOrganismDetails
Tyrosine-protein kinase ITK/TSK
A
109Mus musculusMutation(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
MoleculeChainsSequence LengthOrganismDetails
Lymphocyte cytosolic protein 2 phosphopeptide fragment
B
8Mus musculusMutation(s): 0 
Gene Names: Lcp2
Find proteins for Q60787 (Mus musculus)
Go to UniProtKB:  Q60787
Small Molecules
Modified Residues  3 Unique
IDChainsTypeFormula2D DiagramParent
NH2
Query on NH2
B
NON-POLYMERH2 N

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PTR
Query on PTR
B
L-PEPTIDE LINKINGC9 H12 N O6 PTYR
ACE
Query on ACE
A, B
NON-POLYMERC2 H4 O

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Experimental Data & Validation

Experimental Data

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

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

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