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The X-ray Crystallographic Structure of Human EAT2 (SH2D1B)

Mohammed Taha, Eric Nezerwa, Hyun-Joo Nam1

  • 1Department of Bioengineering, The University of Texas at Dallas, 800 W. Campbell Rd, RL10, Richardson, USA. hnam@utdallas.edu.

Protein and Peptide Letters
|September 3, 2016
PubMed

Insights

Ewing's Sarcoma transcript-2 (EAT2) regulates immune cell signaling by binding to SLAM receptors. Structural analysis reveals conformational differences impacting ligand binding, challenging previous affinity data.

Area of Science:

  • Molecular Biology
  • Immunology
  • Structural Biology

Background:

  • Ewing's Sarcoma transcript-2 (EAT2), also known as SH2D1B, is crucial for regulating Signaling Lymphocytic Activation Molecule (SLAM) family receptor functions.
  • SLAM receptors initiate downstream signaling cascades upon phosphorylation of tyrosine residues in their cytoplasmic tails.

Purpose of the Study:

  • To determine the crystal structure of the human EAT2 protein in an unliganded state.
  • To investigate conformational differences in EAT2 compared to its mouse counterpart and analyze its binding characteristics relative to SAP.

Main Methods:

  • X-ray crystallography was employed to determine the three-dimensional structure of human EAT2.
  • Comparative analysis of EAT2 structure with existing data for mouse EAT2-peptide complexes and human SAP.

Main Results:

  • The crystal structure of human EAT2 in an unliganded form was successfully determined.
  • Conformational variations were observed in ligand-binding loops of human EAT2 compared to the mouse EAT2-peptide complex.
  • EAT2 exhibited similar binding energies to unphosphorylated ligands as SAP, contrasting with prior findings of lower EAT2 affinity.

Conclusions:

  • The determined structure provides insights into EAT2's unliganded state and potential ligand interactions.
  • Observed conformational differences suggest potential allosteric regulation or distinct binding mechanisms.
  • Discrepancies in binding affinity data highlight the potential involvement of factors beyond SH2 domains in EAT2-mediated signaling regulation.

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