Low-mode docking search in iGluR homology models implicates three residues in the control of ligand selectivity

J Mol Recognit. Mar-Apr 2005;18(2):183-9. doi: 10.1002/jmr.713.

Abstract

Homology models of the ionotropic rat kainate receptor iGluR6, based on the ligand binding domains of iGluR2, were constructed. A systematic analysis by low-mode docking searches of kainic acid in homology models of the native iGluR6 receptor, chimeric (iGluR2 and iGluR6) receptors and mutant receptors have identified three residues which influence the conformation of kainic acid in the binding core and hence the affinity for kainic acid. These residues are Leu650, Thr649 and Leu704, all located in domain 2. Leu650 has previously been implicated in the control of selectivity of iGluR2. However, this is the first report that suggests that Thr649 and Leu704 play a role in receptor selectivity.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Binding Sites
  • DNA Mutational Analysis
  • Excitatory Amino Acid Agonists / pharmacology*
  • Kainic Acid / pharmacology*
  • Ligands
  • Models, Molecular
  • Molecular Conformation
  • Molecular Sequence Data
  • Protein Binding
  • Rats
  • Receptors, AMPA / chemistry
  • Receptors, AMPA / drug effects
  • Receptors, AMPA / metabolism*
  • Receptors, Kainic Acid / chemistry
  • Receptors, Kainic Acid / drug effects
  • Receptors, Kainic Acid / metabolism*
  • Sequence Homology, Amino Acid
  • Structure-Activity Relationship

Substances

  • Excitatory Amino Acid Agonists
  • Gluk2 kainate receptor
  • Ligands
  • Receptors, AMPA
  • Receptors, Kainic Acid
  • glutamate receptor ionotropic, AMPA 2
  • Kainic Acid