title: Structure and dynamics of AMPA receptor GluA2 in resting, pre-open, and desensitized states.
abstract: Ionotropic glutamate receptors (iGluRs) mediate the majority of fast excitatory signaling in the nervous system. Despite the profound importance of iGluRs to neurotransmission, little is known about the structures and dynamics of intact receptors in distinct functional states. Here, we elucidate the structures of the intact GluA2 AMPA receptor in an apo resting/closed state, in an activated/pre-open state bound with partial agonists and a positive allosteric modulator, and in a desensitized/closed state in complex with fluorowilliardiine. To probe the conformational properties of these states, we carried out double electron-electron resonance experiments on cysteine mutants and cryoelectron microscopy studies. We show how agonist binding modulates the conformation of the ligand-binding domain "layer" of the intact receptors and how, upon desensitization, the receptor undergoes large conformational rearrangements of the amino-terminal and ligand-binding domains. We define mechanistic principles by which to understand antagonism, activation, and desensitization in AMPA iGluRs.
authors.affiliation: Vollum Institute, Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA.
authors.forename: Katharina L
authors.initials: KL
authors.lastname: Dürr
authors.affiliation: Vollum Institute, Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA.
authors.forename: Lei
authors.initials: L
authors.lastname: Chen
authors.affiliation: Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN 37232, USA.
authors.forename: Richard A
authors.initials: RA
authors.lastname: Stein
authors.affiliation: Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA; Howard Hughes Medical Institute, Harvard Medical School, Boston, MA 02115, USA.
authors.forename: Rita
authors.initials: R
authors.lastname: De Zorzi
authors.affiliation: Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA.
authors.forename: I Mihaela
authors.initials: IM
authors.lastname: Folea
authors.affiliation: Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA; Howard Hughes Medical Institute, Harvard Medical School, Boston, MA 02115, USA.
authors.forename: Thomas
authors.initials: T
authors.lastname: Walz
authors.affiliation: Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN 37232, USA.
authors.forename: Hassane S
authors.initials: HS
authors.lastname: Mchaourab
authors.affiliation: Vollum Institute, Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA; Howard Hughes Medical Institute, Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA. Electronic address: gouauxe@ohsu.edu.
authors.forename: Eric
authors.initials: E
authors.lastname: Gouaux
mesh_terms: D000818:Animals; D020285:Cryoelectron Microscopy; D018360:Crystallography, X-Ray; D005472:Fluorouracil / Q000031:analogs & derivatives / Q000378:metabolism; D055786:Gene Knockout Techniques; D007608:Kainic Acid / Q000378:metabolism; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D017434:Protein Structure, Tertiary; D051381:Rats; D018091:Receptors, AMPA / Q000819:agonists / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*
chemical_list: D018091:Receptors, AMPA; C104722:glutamate receptor ionotropic, AMPA 2; D007608:Kainic Acid; D005472:Fluorouracil
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