Binding Specificity of Multiprotein Signaling Complexes Is Determined by Both Cooperative Interactions and Affinity Preferences

Biochemistry. 2004 Apr 13;43(14):4170-8. doi: 10.1021/bi0357311.

Abstract

The generation of multiprotein complexes at receptors and adapter proteins is crucial for the activation of intracellular signaling pathways. In this study, we used multiple biochemical and biophysical methods to examine the binding properties of several SH2 and SH3 domain-containing signaling proteins as they interact with the adapter protein linker for activation of T-cells (LAT) to form multiprotein complexes. We observed that the binding specificity of these proteins for various LAT tyrosines appears to be constrained both by the affinity of binding and by cooperative protein-protein interactions. These studies provide quantitative information on how different binding parameters can determine in vivo binding site specificity observed for multiprotein signaling complexes.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adaptor Proteins, Signal Transducing*
  • Animals
  • Binding Sites
  • Carrier Proteins / chemistry
  • Carrier Proteins / physiology
  • Circular Dichroism
  • GRB2 Adaptor Protein
  • Intracellular Fluid / chemistry*
  • Intracellular Fluid / metabolism*
  • Intracellular Fluid / physiology
  • Macromolecular Substances
  • Membrane Proteins / chemistry
  • Membrane Proteins / physiology
  • Mice
  • Peptide Fragments / chemistry*
  • Peptide Fragments / metabolism
  • Peptide Fragments / physiology*
  • Phospholipase C gamma
  • Phosphopeptides / chemistry
  • Phosphopeptides / physiology
  • Phosphoproteins / chemistry
  • Phosphoproteins / physiology
  • Phosphorylation
  • Protein Binding
  • Proteins / chemistry
  • Proteins / physiology
  • Recombinant Proteins / chemistry
  • Recombinant Proteins / metabolism
  • Signal Transduction*
  • Structure-Activity Relationship
  • Thermodynamics
  • Type C Phospholipases / chemistry
  • Type C Phospholipases / physiology
  • Tyrosine / chemistry

Substances

  • Adaptor Proteins, Signal Transducing
  • Carrier Proteins
  • GRB2 Adaptor Protein
  • Grb2 protein, mouse
  • Lat protein, mouse
  • Macromolecular Substances
  • Membrane Proteins
  • Mona protein, mouse
  • Peptide Fragments
  • Phosphopeptides
  • Phosphoproteins
  • Proteins
  • Recombinant Proteins
  • SLP-76 signal Transducing adaptor proteins
  • Tyrosine
  • Type C Phospholipases
  • Phospholipase C gamma