2024-10-30 REL PDBj PDBj PDBj 2020-06-28 2020-10-21 2020-10-21 2024-10-30 National Natural Science Foundation of China (NSFC) 31600601 China National Natural Science Foundation of China (NSFC) 21778051 China National Natural Science Foundation of China (NSFC) 91753205 China National Natural Science Foundation of China (NSFC) 21532004 China Ministry of Science and Technology (MoST, China) 2017YFA0505200 China Ministry of Science and Technology (MoST, China) 2016YFA0400903 China Ministry of Science and Technology (MoST, China) 2017YFA0505201 China Ministry of Science and Technology (MoST, China) 2017YFA0505403 China Cryo-EM strucutre of human acid-sensing ion channel 1a in complex with snake toxin Mambalgin1 at pH 8.0 Sun DM Liu SL ASIC, human, Mambalgin1 toxin, cryo-EM structure, MEMBRANE PROTEIN Sun D Liu S Li S Zhang M Yang F Wen M Shi P Wang T Pan M Chang S Zhang X Zhang L Tian C Liu L Structural insights into human acid-sensing ion channel 1a inhibition by snake toxin mambalgin1. Elife US 9 2020 32915133 doi:10.7554/eLife.57096 2050-084X 7cft FULLOVERLAP hASIC1a-Mamba1 hASIC1a-Mamba1 0 1 2
The optimized coding DNAs for human hASIC1a (Uniprot: P78348) was synthesized by GeneScript. The truncated hASIC1a (with the carboxyl terminal 60 residues removed, named as hASIC1a-DeltaC) was cloned into the pFastBac1 vector (Invitrogen) with 8-His tag at the amino terminus. Baculovirus-infected Sf9 cells (Thermo Fisher) were used for overexpression and were grown at 300K in serum-free SIM SF medium (Sino Biological Inc.). The mambalgin1 (Mamba1) toxin was obtained using a hydrazide-based chemical synthesis method.
Homo sapiens Acid-sensing ion channel 1 Homo sapiens 0.054701296999999996 3 Spodoptera frugiperda LEVO MHHHHHHHHMELKAEEEEVGGVQPVSIQAFASSSTLHGLAHIFSYERLSLKRALWALCFLGSLAVLLCVCTERVQYYFHY HHVTKLDEVAASQLTFPAVTLCNLNEFRFSQVSKNDLYHAGELLALLNNRYEIPDTQMADEKQLEILQDKANFRSFKPKP FNMREFYDRAGHDIRDMLLSCHFRGEVCSAEDFKVVFTRYGKCYTFNSGRDGRPRLKTMKGGTGNGLEIMLDIQQDEYLP VWGETDETSFEAGIKVQIHSQDEPPFIDQLGFGVAPGFQTFVACQEQRLIYLPPPWGTCKAVTMDSDLDFFDSYSITACR IDCETRYLVENCNCRMVHMPGDAPYCTPEQYKECADPALDFLVEKDQEYCVCEMPCNLTRYGKELSMVKIPSKASAKYLA KKFNKSEQYIGENILVLDIFFEVLNYETIEQKKAYEIAGLLGDIGGQMGLFIGASILTVLELFDYAYEVIKHKLCRR P78348 Mambalgin-1 Dendroaspis polylepis polylepis 0.006574644 3 LEVO LKCYQHGKVVTCHRDMKFCYHNTGMPFRNLKLILQGCSSSCSETENNKCCSTDRCNK P0DKR6 2-acetamido-2-deoxy-beta-D-glucopyranose 0.000221208 6 NAG singleParticle particle 3.1 8.0
20 mM Tris (pH 8.0), 200 mM NaCl, 0.05% DDM, 0.01% CHS
 Quantifoil R1.2/1.3 COPPER 300 PLASMA CLEANING OTHER 101.325 ETHANE 100 298 FEI VITROBOT MARK IV
Purified hASIC1a-Mamba1 complex (3 ul) at a concentration of 3.1 mg/ml was added to the freshly plasma-cleaned holey carbon grid (Quantifol, R1.2/1.3, 300 mesh, Cu), blotted for 5 s at 100% humidity with a Vitrobot Mark IV (ThermoFisher Scientific) and plunge frozen into liquid ethane cooled by liquid nitrogen..
The purified hASIC1a protein in a buffer comtaining 20 mM Tris (pH 8.0), 200 mM NaCl, 0.05% DDM, 0.01% CHS concentrated to about 5 mg/ml based on A280 measurement, using a 100-kDa cutoff Centricon (Millipore). The chemical synthesized, lyophilized Mamba1 was dissolved in buffer containing 20 mM Tris (pH 8.0), 200 mM NaCl, 0.05% DDM, 0.01% CHS at a final concentration of 10 mg/ml based on A280 measurement, and added in a 6:1 molar ratio of toxin to hASIC1a channel with incubation for 1 h at 297K.
 FEI TITAN KRIOS SPOT SCAN BRIGHT FIELD FIELD EMISSION GUN 300 FEI TITAN KRIOS AUTOGRID HOLDER NITROGEN
Grids were transferred to a Titan Krios electron microscope (FEI) operated at 300 kV equipped with a Gatan K2 Summit direct detection camera. Images of hASIC1a-Mamba1 complex was collected using the automated image acquisition software SerialEM in counting mode with 29,000x magnification yielding a pixel size of 1.014 A. The total dose of 50 e-/A2 was fractionated to 40 frames with 0.2 s per frame. Nominal defocus values ranged from -1.8 to -2.5 um. The dataset of hASIC1a included 3,364 micrographs.
GATAN K2 SUMMIT (4k x 4k) COUNTING 3 3364 8.0 50.0 1 234742 3.9 FSC 0.143 CUT-OFF RELION 2.1 119901 ANGULAR RECONSTITUTION ANGULAR RECONSTITUTION RELION 2.1 emd_30347.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 200 200 200 0 0 0 200 200 200 202.80002 202.80002 202.80002 90.0 90.0 90.0 X Y Z -0.08445994 0.12937292 0.00029731385 0.0035499886 1.014 1.014 1.014 0.0103 AUTHOR 6AVE A 13-462 PDB experimental model FLEXIBLE FIT