2026-03-11 REL RCSB INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY RCSB RCSB 2026-01-21 2026-03-11 2026-03-11 2026-03-11 National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID) P01 AI172531 United States SARS-CoV-2 spike S2 subunit in complex with polyclonal Fabs (Apex-A epitope) Park S Ward AB SARS-CoV-2, Coronavirus, Immune system, antibody, VIRAL PROTEIN, VIRAL PROTEIN-Immune System complex Park S Mischka J Okba N Abbad A Yuan M Srivastava K Gleason C Mulder LCF Copps J Saam K Bangaru S Krammer F Wilson IA Simon V Ward AB The buried S2 apex of SARS-CoV-2 spike elicits an immunodominant germline-restricted public antibody response. Biorxiv US 2026 41756886 doi:10.64898/2026.02.18.706653 2692-8205 EMDB EMD-75193 associated EM volume SARS-CoV-2 S2 subunit in complex with polyclonal Fabs (Apex-A epitope) SARS-CoV-2 S2 subunit in complex with polyclonal Fabs (Apex-A epitope) 0 Homo sapiens SARS-CoV-2 S2 subunit 1 Severe acute respiratory syndrome coronavirus 2 polyclonal Fabs (Apex-A epitope) 1 Homo sapiens singleParticle particle 0.01 7.5 NEGATIVE Uranyl Formate TFS TALOS F200C FLOOD BEAM BRIGHT FIELD FIELD EMISSION GUN 200 2.0 2.5 NITROGEN FEI CETA (4k x 4k) 27.1 1 NONE EMD-74740 C1 22.0 FSC 0.143 CUT-OFF RELION 4.0 7885 MAXIMUM LIKELIHOOD MAXIMUM LIKELIHOOD emd_75193.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 192 192 192 0 0 0 192 192 192 384.0 384.0 384.0 90.0 90.0 90.0 X Y Z -0.04173646 0.08811668 0.000024760096 0.0038886147 2.0 2.0 2.0 0.03 AUTHOR 3D map of the SARS-CoV-2 spike S2 subunit with polyclonal antibodies from donor2 bound to the S2 Apex-A epitope, determined by ns-EMPEM emd_75193_additional_11.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 192 192 192 0 0 0 192 192 192 384.0 384.0 384.0 90.0 90.0 90.0 X Y Z -0.0541086 0.0909027 -0.000012234266 0.0037657334 2.0 2.0 2.0 AUTHOR 3D map of the SARS-CoV-2 spike S2 subunit with polyclonal antibodies from donor9-T2 bound to the S2 Apex-A epitope, determined by ns-EMPEM emd_75193_additional_10.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 192 192 192 0 0 0 192 192 192 384.0 384.0 384.0 90.0 90.0 90.0 X Y Z -0.2828425 0.6071338 0.00032075634 0.02566121 2.0 2.0 2.0 AUTHOR 3D map of the SARS-CoV-2 spike S2 subunit with polyclonal antibodies from donor9-T1 bound to the S2 Apex-A epitope, determined by ns-EMPEM emd_75193_additional_9.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 160 160 160 0 0 0 160 160 160 320.0 320.0 320.0 90.0 90.0 90.0 X Y Z -0.0384106 0.11074572 -0.000052049614 0.0050366367 2.0 2.0 2.0 AUTHOR 3D map of the SARS-CoV-2 spike S2 subunit with polyclonal antibodies from donor3 bound to the S2 Apex-A epitope, determined by ns-EMPEM emd_75193_additional_8.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 128 128 128 0 0 0 128 128 128 256.0 256.0 256.0 90.0 90.0 90.0 X Y Z -0.06077593 0.12809499 0.0000025730901 0.005859617 2.0 2.0 2.0 AUTHOR 3D map of the SARS-CoV-2 spike S2 subunit with polyclonal antibodies from donor4 bound to the S2 Apex-A epitope, determined by ns-EMPEM emd_75193_additional_7.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 112 112 112 0 0 0 112 112 112 224.0 224.0 224.0 90.0 90.0 90.0 X Y Z -0.10952368 0.20653048 -0.000013189951 0.006327553 2.0 2.0 2.0 AUTHOR 3D map of the SARS-CoV-2 spike S2 subunit with polyclonal antibodies from donor5 bound to the S2 Apex-A epitope, determined by ns-EMPEM emd_75193_additional_6.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 192 192 192 0 0 0 192 192 192 384.0 384.0 384.0 90.0 90.0 90.0 X Y Z -0.06264357 0.10854425 0.000043293352 0.00393499 2.0 2.0 2.0 AUTHOR 3D map of the SARS-CoV-2 spike S2 subunit with polyclonal antibodies from donor6 bound to the S2 Apex-A epitope, determined by ns-EMPEM emd_75193_additional_5.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 192 192 192 0 0 0 192 192 192 384.0 384.0 384.0 90.0 90.0 90.0 X Y Z -0.04516525 0.09404305 0.00006767265 0.0038819923 2.0 2.0 2.0 AUTHOR 3D map of the SARS-CoV-2 spike S2 subunit with polyclonal antibodies from donor7 bound to the S2 Apex-A epitope, determined by ns-EMPEM emd_75193_additional_4.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 192 192 192 0 0 0 192 192 192 384.0 384.0 384.0 90.0 90.0 90.0 X Y Z -0.049806125 0.08253624 0.000020601408 0.003639658 2.0 2.0 2.0 AUTHOR 3D map of the SARS-CoV-2 spike S2 subunit with polyclonal antibodies from donor8-T2 bound to the S2 Apex-A epitope, determined by ns-EMPEM emd_75193_additional_3.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 192 192 192 0 0 0 192 192 192 384.0 384.0 384.0 90.0 90.0 90.0 X Y Z -0.045408227 0.077977285 0.00006823914 0.0035360358 2.0 2.0 2.0 AUTHOR 3D map of the SARS-CoV-2 spike S2 subunit with polyclonal antibodies from donor8-T1 bound to the S2 Apex-A epitope, determined by ns-EMPEM emd_75193_additional_2.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 192 192 192 0 0 0 192 192 192 384.0 384.0 384.0 90.0 90.0 90.0 X Y Z -0.03395194 0.090198964 0.00007402967 0.0037730837 2.0 2.0 2.0 AUTHOR 3D map of the SARS-CoV-2 spike S2 subunit with polyclonal antibodies from donor1 bound to the S2 Apex-A epitope, determined by ns-EMPEM emd_75193_additional_1.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 192 192 192 0 0 0 192 192 192 384.0 384.0 384.0 90.0 90.0 90.0 X Y Z -0.044484783 0.101385556 0.000048344744 0.0038067668 2.0 2.0 2.0 AUTHOR 3D map of the SARS-CoV-2 spike S2 subunit with polyclonal antibodies from donor8-T3 bound to the S2 Apex-A epitope, determined by ns-EMPEM emd_75193_half_map_2.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 192 192 192 0 0 0 192 192 192 384.0 384.0 384.0 90.0 90.0 90.0 X Y Z -0.04595354 0.093568034 0.0000298501 0.004405075 2.0 2.0 2.0 AUTHOR Half Map A emd_75193_half_map_1.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 192 192 192 0 0 0 192 192 192 384.0 384.0 384.0 90.0 90.0 90.0 X Y Z -0.052408904 0.09003583 0.000019133859 0.004385555 2.0 2.0 2.0 AUTHOR Half Map B