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CSHL structural biologists reveal novel drug binding site in NMDA receptor subunit
Date:6/16/2011

Structural biologists at Cold Spring Harbor Laboratory (CSHL) have obtained a precise molecular map of the binding site for an allosteric inhibitor in a subtype of the NMDA (N-methyl-D-aspartate) receptor, which is commonly expressed in brain cells.

The newly discovered binding site -- a docking port within the receptor -- is important because it is a potential target for drugs that can modulate NMDA receptors, dysfunctions of which have been implicated in depression, schizophrenia, Parkinson's and Alzheimer's diseases as well as stroke-related brain injuries.

Allosteric sites in neurotransmitters are distinguished from their "primary" or "active" binding sites. Importantly, the newly obtained molecular map will enable scientists to design highly specific compounds that home in on the allosteric site, thereby minimizing "off-target effects," which give rise to a drug's unwanted side effects.

In a study led by CSHL Associate Professor Hiro Furukawa and published June 15 in the journal Nature, the allosteric site of interest is shown to be in the region of NMDA receptors called the amino terminal domain. A class of allosteric inhibitors for NMDA receptors, called phenylethanolamines, has previously been identified. One such compound, ifenprodil, is known to bind specifically to the GluN1/GluN2B subtype of the NMDA receptor, but not to other subtypes. The neuroprotective properties of phenylethanolamines have inspired scientists to employ them for treatment of neurological diseases and disorders. Some are now being tested in clinical trials for depression, pain, Parkinson's disease, and Alzheimer's disease.

The detailed blueprint of the allosteric site where phenylethanolamines bind to the receptor will facilitate rational design of improved compounds. In the work published on June 15th, Furukawa's group identifies the precise binding site of phenylethanolamine within the amino terminal domain of GluN1/GluN2B NMDA
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Contact: Peter Tarr
tarr@cshl.edu
516-367-5055
Cold Spring Harbor Laboratory
Source:Eurekalert

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