2020-12-09 REL RCSB RCSB RCSB 2020-07-28 2020-11-11 2020-11-11 2020-12-09 National Natural Science Foundation of China (NSFC) 31630030 China National Science Foundation (NSF, United States) GM071940 United States Ministry of Science and Technology (MoST, China) 2017YFA0505300 China Structure of GABAA receptor inside synapse Liu YT Tao CL Zhang X Xia W Shi DQ Qi L Xu C Sun R Li XW Lau PM Zhou ZH Bi GQ Liu YT Tao CL Zhang X Xia W Shi DQ Qi L Xu C Sun R Li XW Lau PM Zhou ZH Bi GQ Mesophasic organization of GABA A receptors in hippocampal inhibitory synapses. Nat.Neurosci. US 23 1589 1596 2020 33139942 doi:10.1038/s41593-020-00729-w 1097-6256 EMD-22365 associated EM volume gamma-aminobutyric acid receptor gamma-aminobutyric acid receptor 0 Rattus norvegicus brain hippocampus synaptic membrane 0.25 subtomogramAveraging cell 7.3 Quantifoil R2/2 GOLD GLOW DISCHARGE ETHANE 100 298 FEI VITROBOT MARK IV
This sample is cultured hippocampal neurons.
 FEI TITAN KRIOS FLOOD BEAM BRIGHT FIELD FIELD EMISSION GUN 300 2.7 NITROGEN GATAN K2 SUMMIT (4k x 4k) SUPER-RESOLUTION 2.5
Tilt series were collected first from 0 to -60 and then from +2 to +60 at 2 intervals using FEI Xplore 3D software, with the defocus value set at -12 to -18 um, and the total electron dosage of about 100 e-/A2. The final pixel size was 0.755 nm. For the analysis of GABAARs, cryoET data were collected using a Titan Krios (Thermo Fisher) equipped with a Volta phase plate (VPP), a post-column energy filter (Gatan image filter), and a K2 Summit direct electron detector (Gatan). The energy filter slit was set at 20 eV. The Titan Krios was operated at an acceleration voltage of 300 KV. When VPP was used, the defocus value was maintained at -1 um; otherwise, it was maintained at -4 um. The VPP was conditioned by pre-irradiation for 60 s to achieve an initial phase shift of about 0.3pi. Images were collected by the K2 camera in counting mode or super-resolution mode. When counting mode was used, the pixel size was 0.435 nm. For super-resolution mode image, the final pixel size was 0.265 nm. Tilt series were acquired using SerialEM49 with two tilt schemes: from +48 to -60 and from +50 to +66 at an interval of 2; from +48 to -60 and from +51 to +66 at an interval of 3. The total accumulated dose is ~150 e-/A2. For sub-tomogram analysis, 6 grids were used for data collection. Totally, 32 and 40 inhibitory synapses were imaged with and without VPP, respectively.
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