Can selective ligands for glutamate binding proteins be rationally designed?

Area of Science:

• Neuroscience
• Molecular Biology
• Pharmacology

Background:

• L-Glutamate is a crucial neurotransmitter involved in storage, transport, and reception.
• Proteins binding L-Glutamate, including receptors and transporters, are vital for its function.
• Emerging structural data suggest distinct conformations for glutamate receptors and transporters.

Purpose of the Study:

• To compare and contrast information on various glutamate binding proteins.
• To explore the pharmacological opportunities presented by distinct binding conformations.
• To address interpretational issues arising from ligand cross-reactivity with system Xc-.

Main Methods:

• Review and synthesis of existing literature on glutamate binding proteins.
• Comparison of glutamate receptors (AMPA, NMDA, KA, mGlu) and transporters (EAATs, XCT, GVT).
• Analysis of ligand cross-reactivity and its implications for CNS damage mechanisms.

Main Results:

• Receptors and transporters appear to bind L-Glutamate in different conformations.
• Ligand cross-reactivity with system Xc- poses interpretational challenges.
• Successful development of NMDA antagonist memantine and agents in clinical trials for cognitive disorders and anxiety.

Conclusions:

• Selectivity among glutamate binding proteins is achievable, as evidenced by recent drug approvals and trials.
• Critical comparison of binding protein targets is essential for understanding and exploiting ligand cross-reactivity.
• Pharmacological targeting of glutamate pathways holds promise for treating neurological and psychiatric conditions.