Serine racemase regulated by binding to stargazin and PSD-95: Potential N-methyl-D-aspartate-α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (NMDA-AMPA) glutamate neurotransmission cross-talk

Ting Martin Ma, Bindu D. Paul, Chenglai Fu, Shaohui Hu, Heng Zhu, Seth Blackshaw, Herman Wolosker, Solomon H. Snyder

Research output: Contribution to journalArticlepeer-review

Abstract

D-Serine, an endogenous co-agonist for the glycine site of the synaptic NMDA glutamate receptor, regulates synaptic plasticity and is implicated in schizophrenia. Serine racemase (SR) is the enzyme that converts L-serine to D-serine. In this study, we demonstrate that SR interacts with the synaptic proteins, postsynaptic density protein 95 (PSD-95) and stargazin, forming a ternary complex. SR binds to the PDZ3 domain of PSD-95 through the PDZ domain ligand at its C terminus. SR also binds to the C terminus of stargazin, which facilitates the cell membrane localization of SR and inhibits its activity.AMPAreceptor activation internalizes SR and disrupts its interaction with stargazin, therefore derepressing SR activity, leading to more D-serine production and potentially facilitatingNMDAreceptor activation. These interactions regulate the enzymatic activity as well as the intracellular localization of SR, potentially coupling the activities of NMDA and AMPA receptors. This shuttling of a neurotransmitter synthesizing enzyme between two receptors appears to be a novel mode of synaptic regulation.

Original languageEnglish (US)
Pages (from-to)29631-29641
Number of pages11
JournalJournal of Biological Chemistry
Volume289
Issue number43
DOIs
StatePublished - Oct 24 2014

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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