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Structure of the Glutamate-Like Receptor GLR3.2 ligand-binding domain

Shanti Pal Gangwar, Marriah Green, Alexander I. Sobolevsky
doi: https://doi.org/10.1101/2019.12.23.887497
Shanti Pal Gangwar
1Department of Biochemistry and Molecular Biophysics, Columbia University, 650 West 168th Street, New York, NY 10032
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Marriah Green
1Department of Biochemistry and Molecular Biophysics, Columbia University, 650 West 168th Street, New York, NY 10032
2Nutritional and Metabolic Biology Program, 630 West 168th Street, New York, NY 10032
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Alexander I. Sobolevsky
1Department of Biochemistry and Molecular Biophysics, Columbia University, 650 West 168th Street, New York, NY 10032
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  • For correspondence: as4005@cumc.columbia.edu
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Abstract

Glutamate-like receptors (GLRs) in plants play an important role in a number of physiological processes, including wound response, stomatal aperture control, seed germination, root development, innate immune responses, pollen tube growth and morphogenesis. GLRs share amino acid sequence similarity with ionotropic glutamate receptors (iGluRs) that mediate neurotransmission in the nervous system of vertebrates. In contrast to iGluRs, however, for which numerous full-length structures are available, the structural information about the plant GLRs has been missing. Here we determine crystal structures of Arabidopsis thaliana GLR3.2 ligand-binding domain (LBD) in complex with glycine and methionine to 1.57 and 1.86 Å resolution, respectively. Our structures show a fold similar to iGluRs, with several secondary structure elements either missing or different. The closed clamshell conformation of GLR3.2 LBD suggests that both glycine and methionine act as agonists. The structures reveal molecular determinants of ligand binding and explain the promiscuity of GLRs’ ligand activation compared to iGluRs. Structural similarities of LBDs confirm an evolutionary relationship between GLRs and iGluRs and predict common molecular principles of their gating mechanisms that are driven by the bilobed clamshell-like LBDs.

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Posted December 24, 2019.
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Structure of the Glutamate-Like Receptor GLR3.2 ligand-binding domain
Shanti Pal Gangwar, Marriah Green, Alexander I. Sobolevsky
bioRxiv 2019.12.23.887497; doi: https://doi.org/10.1101/2019.12.23.887497
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Structure of the Glutamate-Like Receptor GLR3.2 ligand-binding domain
Shanti Pal Gangwar, Marriah Green, Alexander I. Sobolevsky
bioRxiv 2019.12.23.887497; doi: https://doi.org/10.1101/2019.12.23.887497

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