V-shaped (channel-formed), ATP-bound, VX809-bound conformation of wild-type human CFTR (sharpened AHD1 local refinement map from cryoSPARC)

2026-09-09 REL RCSB INITIAL_RELEASE REPOSITORY RCSB RCSB 2025-08-27 2026-09-09 2026-09-09 2026-09-09 Cystic Fibrosis Foundation HUNT13XX0, HUNT18G0, HUNT20G0, 004400G222-Hunt, 007997G224-Hunt, FRANK16XX0, FRANK18G0 United States V-shaped (channel-formed), ATP-bound, VX809-bound conformation of wild-type human CFTR (sharpened AHD1 local refinement map from cryoSPARC) Hunt JF Paige AS Baranwal J Cohen BM Goldberg PM Wang C Loughlin BJ Kappes JC Yang Z Jiang F Govaerts C Overtus M Rich Z cystic fibrosis, CFTR, nanobody, protein folding, MEMBRANE PROTEIN Hunt JF Paige AS Baranwal J Cohen BM Goldberg PM Wang C Loughlin BJ Kappes JC Yang Z Jiang F Govaerts C Overtus M Rich Z Nanobody-Driven Stabilization Synergistically Rescues F508del-CFTR and Reveals an Alternative Active State of the Channel To Be Published 0353 EMDB EMD-72356 associated EM volume Wild-type human CFTR solubilized in digitonin and cholesterol-hemisuccinate in the presence of 2 mM MgATP Wild-type human CFTR solubilized in digitonin and cholesterol-hemisuccinate in the presence of 2 mM MgATP 0 1 2 0.1725 Wild type human Cystic Fibrosis Transmembrane Conductance Regulator (hCFTR) 1 1 Homo sapiens singleParticle particle 1.5 7.5 200.0 NaCl Sodium Chloride 3.0 MgCl2 Magnesium Chloride 50.0 C4H11NO3 Tris buffer 0.06 C56H92O29 Digitonin 2.0 C10H16N5O13P3 ATP Quantifoil R0.6/1 GOLD 300 GOLD HOLEY 50.0 PLASMA CLEANING 25 OTHER

The grid was treated in a Solarus Plasma Cleaner 950 (Gatan Inc., USA) for 25 sec with O2/H2 flow-rates of 27.5/6.4 sccm and 15 W cleaning power.

ETHANE 100 277 FEI VITROBOT MARK IV TFS KRIOS FLOOD BEAM BRIGHT FIELD FIELD EMISSION GUN 300 100.0 2.7 0.2 2.9 105000.0 FEI TITAN KRIOS AUTOGRID HOLDER NITROGEN 85.0 90.0 GIF Quantum ER 20 GATAN K3 BIOQUANTUM (6k x 4k) 5760 4092 1 11110 2.5 58.0

Movies comprised 40 frames collected in 2.5 seconds.

1 2493670

Particle count after low-resolution template picking, which was followed by light 2D cleaning. That process, which included all 2D classes roughly resembling views of CFTR, yielded 702,919 particles that were input into iterative heterorefinement against a set of protein classes and 6 decoy volumes, resulting in 252,534 particles (42%) being assigned to the final set of protein classes.

cryoSPARC 4.3.1 Patch CTF correction PHASE FLIPPING AND AMPLITUDE CORRECTION 1 BACK PROJECTION 3.46 FSC 0.143 CUT-OFF cryoSPARC 4.7.0 81674 MAXIMUM LIKELIHOOD cryoSPARC 4.3.1 MAXIMUM LIKELIHOOD cryoSPARC 4.3.1 5 50507.0 cryoSPARC 4.7.0

Final classes at the conclusion of the first stage of iterative heterorefinement.

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Real space refinement in PHENIX v 2._6048

emd_72356_half_map_2.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 320 320 320 0 0 0 320 320 320 265.6 265.6 265.6 90.0 90.0 90.0 X Y Z -0.12971073 0.2962844 0.00034163252 0.0075339563 0.83000004 0.83000004 0.83000004 AUTHOR ::::EMDATABANK.org::::EMD-72356:::: emd_72356_half_map_1.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 320 320 320 0 0 0 320 320 320 265.6 265.6 265.6 90.0 90.0 90.0 X Y Z -0.12298747 0.29862624 0.00034499384 0.007826959 0.83000004 0.83000004 0.83000004 AUTHOR ::::EMDATABANK.org::::EMD-72356::::