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    <admin>
        <current_status>
            <date>2021-09-22</date>
            <code>REL</code>
            <processing_site>RCSB</processing_site>
        </current_status>
        <sites>
            <deposition>RCSB</deposition>
            <last_processing>RCSB</last_processing>
        </sites>
        <key_dates>
            <deposition>2020-11-14</deposition>
            <header_release>2021-09-22</header_release>
            <map_release>2021-09-22</map_release>
            <update>2021-09-22</update>
        </key_dates>
        <grant_support>
            <grant_reference>
                <funding_body>National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)</funding_body>
                <code>P50AI150476</code>
                <country>United States</country>
            </grant_reference>
            <grant_reference>
                <funding_body>National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)</funding_body>
                <code>S10OD020054</code>
                <country>United States</country>
            </grant_reference>
            <grant_reference>
                <funding_body>National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)</funding_body>
                <code>S10OD021741</code>
                <country>United States</country>
            </grant_reference>
        </grant_support>
        <title>Spike protein trimer</title>
        <authors_list>
            <author>Asarnow D</author>
            <author>Faust B</author>
            <author>Bohn M</author>
            <author>Bulkley D</author>
            <author>Manglik A</author>
            <author>Craik CS</author>
            <author>Cheng Y</author>
        </authors_list>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author order="1">Asarnow D</author>
                    <author order="2">Wang B</author>
                    <author order="3">Lee WH</author>
                    <author order="4">Hu Y</author>
                    <author order="5">Huang CW</author>
                    <author order="6">Faust B</author>
                    <author order="7">Ng PML</author>
                    <author order="8">Ngoh EZX</author>
                    <author order="9">Bohn M</author>
                    <author order="10">Bulkley D</author>
                    <author order="11">Pizzorno A</author>
                    <author order="12">Ary B</author>
                    <author order="13">Tan HC</author>
                    <author order="14">Lee CY</author>
                    <author order="15">Minhat RA</author>
                    <author order="16">Terrier O</author>
                    <author order="17">Soh MK</author>
                    <author order="18">Teo FJ</author>
                    <author order="19">Yeap YYC</author>
                    <author order="20">Seah SGK</author>
                    <author order="21">Chan CEZ</author>
                    <author order="22">Connelly E</author>
                    <author order="23">Young NJ</author>
                    <author order="24">Maurer-Stroh S</author>
                    <author order="25">Renia L</author>
                    <author order="26">Hanson BJ</author>
                    <author order="27">Rosa-Calatrava M</author>
                    <author order="28">Manglik A</author>
                    <author order="29">Cheng Y</author>
                    <author order="30">Craik CS</author>
                    <author order="31">Wang CI</author>
                    <title>Structural insight into SARS-CoV-2 neutralizing antibodies and modulation of syncytia.</title>
                    <journal_abbreviation>Cell</journal_abbreviation>
                    <volume>184</volume>
                    <first_page>3192</first_page>
                    <last_page>3204.e16</last_page>
                    <year>2021</year>
                    <external_references type="DOI">doi:10.1016/j.cell.2021.04.033</external_references>
                    <external_references type="ISSN">1097-4172</external_references>
                </journal_citation>
            </primary_citation>
            <secondary_citation>
                <journal_citation published="true">
                    <author order="32">Goddard TD</author>
                    <author order="33">Huang CC</author>
                    <author order="34">Meng EC</author>
                    <author order="35">Pettersen EF</author>
                    <author order="36">Couch GS</author>
                    <author order="37">Morris JH</author>
                    <author order="38">Ferrin TE</author>
                    <title>UCSF ChimeraX: Meeting Modern Challenges in Visualization and Analysis</title>
                    <journal_abbreviation>Protein Sci.</journal_abbreviation>
                    <country>US</country>
                    <volume>27</volume>
                    <first_page>14</first_page>
                    <last_page>25</last_page>
                    <year>2018</year>
                    <external_references type="PUBMED">28710774</external_references>
                    <external_references type="DOI">doi:10.1002/pro.3235</external_references>
                    <external_references type="ISSN">0961-8368</external_references>
                    <external_references type="CSD">0795</external_references>
                    <external_references type="ASTM">PRCIEI</external_references>
                </journal_citation>
            </secondary_citation>
        </citation_list>
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            <emdb_reference>
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                <relationship>
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    <sample>
        <name>SARS-CoV-2 Spike protein trimer</name>
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            <complex_supramolecule supramolecule_id="1">
                <name>SARS-CoV-2 Spike protein trimer</name>
                <parent>0</parent>
                <macromolecule_list>
                    <macromolecule>
                        <macromolecule_id>1</macromolecule_id>
                    </macromolecule>
                </macromolecule_list>
                <natural_source database="NCBI">
                    <organism ncbi="2697049">Severe acute respiratory syndrome coronavirus 2</organism>
                </natural_source>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="10029">Cricetulus griseus</recombinant_organism>
                    <recombinant_strain>expiCHO</recombinant_strain>
                    <recombinant_cell>Ovary</recombinant_cell>
                </recombinant_expression>
                <molecular_weight>
                    <theoretical units="MDa">0.4571</theoretical>
                </molecular_weight>
            </complex_supramolecule>
        </supramolecule_list>
        <macromolecule_list>
            <protein_or_peptide macromolecule_id="1">
                <name>Spike glycoprotein</name>
                <natural_source database="NCBI">
                    <organism ncbi="2697049">Severe acute respiratory syndrome coronavirus 2</organism>
                </natural_source>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="10029">Cricetulus griseus</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MFVFLVLLPLVSSQCVNLTTRTQLPPAYTNSFTRGVYYPDKVFRSSVLHSTQDLFLPFFSNVTWFHAIHVSGTNGTKRFDNPVLPFNDGVYFASTEKSNIIRGWIFGTTLDSKTQSLLIVNNATNVVIKVCEFQFCNDPFLGVYYHKNNKSWMESEFRVYSSANNCTFEYVSQPFLMDLEGKQGNFKNLREFVFKNIDGYFKIYSKHTPINLVRDLPQGFSALEPLVDLPIGINITRFQTLLALHRSYLTPGDSSSGWTAGAAAYYVGYLQPRTFLLKYNENGTITDAVDCALDPLSETKCTLKSFTVEKGIYQTSNFRVQPTESIVRFPNITNLCPFGEVFNATRFASVYAWNRKRISNCVADYSVLYNSASFSTFKCYGVSPTKLNDLCFTNVYADSFVIRGDEVRQIAPGQTGKIADYNYKLPDDFTGCVIAWNSNNLDSKVGGNYNYLYRLFRKSNLKPFERDISTEIYQAGSTPCNGVEGFNCYFPLQSYGFQPTNGVGYQPYRVVVLSFELLHAPATVCGPKKSTNLVKNKCVNFNFNGLTGTGVLTESNKKFLPFQQFGRDIADTTDAVRDPQTLEILDITPCSFGGVSVITPGTNTSNQVAVLYQDVNCTEVPVAIHADQLTPTWRVYSTGSNVFQTRAGCLIGAEHVNNSYECDIPIGAGICASYQTQTNSPGSASSVASQSIIAYTMSLGAENSVAYSNNSIAIPTNFTISVTTEILPVSMTKTSVDCTMYICGDSTECSNLLLQYGSFCTQLNRALTGIAVEQDKNTQEVFAQVKQIYKTPPIKDFGGFNFSQILPDPSKPSKRSFIEDLLFNKVTLADAGFIKQYGDCLGDIAARDLICAQKFNGLTVLPPLLTDEMIAQYTSALLAGTITSGWTFGAGAALQIPFAMQMAYRFNGIGVTQNVLYENQKLIANQFNSAIGKIQDSLSSTASALGKLQDVVNQNAQALNTLVKQLSSNFGAISSVLNDILSRLDPPEAEVQIDRLITGRLQSLQTYVTQQLIRAAEIRASANLAATKMSECVLGQSKRVDFCGKGYHLMSFPQSAPHGVVFLHVTYVPAQEKNFTTAPAICHDGKAHFPREGVFVSNGTHWFVTQRNFYEPQIITTDNTFVSGNCDVVIGIVNNTVYDPLQPELDSFKEELDKYFKNHTSPDVDLGDISGINASVVNIQKEIDRLNEVAKNLNESLIDLQELGKYEQ</string>
                </sequence>
            </protein_or_peptide>
        </macromolecule_list>
    </sample>
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            <method>singleParticle</method>
            <aggregation_state>particle</aggregation_state>
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                    <buffer>
                        <ph>8.0</ph>
                        <component>
                            <concentration units="mM">10.0</concentration>
                            <name>HEPES</name>
                        </component>
                        <component>
                            <concentration units="mM">200.0</concentration>
                            <formula>NaCl</formula>
                            <name>sodium chloride</name>
                        </component>
                    </buffer>
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                        <model>Quantifoil R1.2/1.3</model>
                        <material>GOLD</material>
                        <mesh>300</mesh>
                        <support_film film_type_id="1">
                            <film_material>CARBON</film_material>
                            <film_topology>HOLEY</film_topology>
                        </support_film>
                        <pretreatment>
                            <type>GLOW DISCHARGE</type>
                            <atmosphere>AIR</atmosphere>
                        </pretreatment>
                    </grid>
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                        <cryogen_name>ETHANE</cryogen_name>
                        <chamber_humidity units="percentage">100</chamber_humidity>
                        <chamber_temperature units="K">4</chamber_temperature>
                        <instrument>FEI VITROBOT MARK IV</instrument>
                        <details>8-10 seconds, blot force 0. </details>
                    </vitrification>
                </single_particle_preparation>
            </specimen_preparation_list>
            <microscopy_list>
                <single_particle_microscopy microscopy_id="1">
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                    <illumination_mode>FLOOD BEAM</illumination_mode>
                    <imaging_mode>BRIGHT FIELD</imaging_mode>
                    <electron_source>FIELD EMISSION GUN</electron_source>
                    <acceleration_voltage units="kV">300</acceleration_voltage>
                    <c2_aperture_diameter units="µm">100.0</c2_aperture_diameter>
                    <nominal_cs units="mm">2.7</nominal_cs>
                    <nominal_defocus_min units="µm">0.5</nominal_defocus_min>
                    <nominal_defocus_max units="µm">1.5</nominal_defocus_max>
                    <nominal_magnification>105000.0</nominal_magnification>
                    <specimen_holder_model>FEI TITAN KRIOS AUTOGRID HOLDER</specimen_holder_model>
                    <cooling_holder_cryogen>NITROGEN</cooling_holder_cryogen>
                    <alignment_procedure>
                        <zemlin_tableau />
                    </alignment_procedure>
                    <specialist_optics>
                        <energy_filter>
                            <name>GIF Bioquantum</name>
                            <slit_width units="eV">20</slit_width>
                        </energy_filter>
                    </specialist_optics>
                    <image_recording_list>
                        <image_recording image_recording_id="1">
                            <film_or_detector_model>GATAN K3 BIOQUANTUM (6k x 4k)</film_or_detector_model>
                            <digitization_details>
                                <dimensions>
                                    <width units="pixel">5760</width>
                                    <height units="pixel">4092</height>
                                </dimensions>
                                <sampling_interval units="µm">5.0</sampling_interval>
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                            <number_grids_imaged>1</number_grids_imaged>
                            <number_real_images>7536</number_real_images>
                            <average_exposure_time units="s">5.9</average_exposure_time>
                            <average_electron_dose_per_image units="e/Å^2">67.7</average_electron_dose_per_image>
                            <details>Movies were collected at super-resolution using correlated double sampling, with a frame time of 0.05 seconds and dose rate 8 e-/px/s</details>
                        </image_recording>
                    </image_recording_list>
                </single_particle_microscopy>
            </microscopy_list>
            <singleparticle_processing image_processing_id="1">
                <image_recording_id>1</image_recording_id>
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                        <software>
                            <name>cryoSPARC</name>
                            <version>2.15.0</version>
                        </software>
                    </software_list>
                </ctf_correction>
                <startup_model type_of_model="OTHER">
                    <details>Ab initio model from cryoSPARC</details>
                </startup_model>
                <final_reconstruction>
                    <number_classes_used>1</number_classes_used>
                    <applied_symmetry>
                        <point_group>C3</point_group>
                    </applied_symmetry>
                    <algorithm>FOURIER SPACE</algorithm>
                    <resolution res_type="BY AUTHOR" units="Å">2.51</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
                    <software_list>
                        <software>
                            <name>cryoSPARC</name>
                            <version>2.15.0</version>
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                    <number_images_used>76424</number_images_used>
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                <initial_angle_assignment>
                    <type>MAXIMUM LIKELIHOOD</type>
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                        <software>
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                    <type>MAXIMUM LIKELIHOOD</type>
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                        <software>
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                </axis_order>
                <statistics>
                    <minimum>-0.40010324</minimum>
                    <maximum>1.3009579</maximum>
                    <average>0.006756887</average>
                    <std>0.07980982</std>
                </statistics>
                <pixel_spacing>
                    <x units="Å">0.8349999</x>
                    <y units="Å">0.8349999</y>
                    <z units="Å">0.8349999</z>
                </pixel_spacing>
                <contour_list>
                    <contour primary="true">
                        <source>AUTHOR</source>
                    </contour>
                </contour_list>
                <label>::::EMDATABANK.org::::EMD-22995::::</label>
                <annotation_details>Spike protein trimer in the closed conformation, half-map A from non-uniform refinement in cryoSPARC v2.15</annotation_details>
            </half_map>
            <half_map format="CCP4" size_kbytes="131073">
                <file>emd_22995_half_map_2.map.gz</file>
                <symmetry>
                    <space_group>1</space_group>
                </symmetry>
                <data_type>IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)</data_type>
                <dimensions>
                    <col>320</col>
                    <row>320</row>
                    <sec>320</sec>
                </dimensions>
                <origin>
                    <col>0</col>
                    <row>0</row>
                    <sec>0</sec>
                </origin>
                <spacing>
                    <x>320</x>
                    <y>320</y>
                    <z>320</z>
                </spacing>
                <cell>
                    <a units="Å">267.19998</a>
                    <b units="Å">267.19998</b>
                    <c units="Å">267.19998</c>
                    <alpha units="deg">90.0</alpha>
                    <beta units="deg">90.0</beta>
                    <gamma units="deg">90.0</gamma>
                </cell>
                <axis_order>
                    <fast>X</fast>
                    <medium>Y</medium>
                    <slow>Z</slow>
                </axis_order>
                <statistics>
                    <minimum>-0.41703418</minimum>
                    <maximum>1.3150512</maximum>
                    <average>0.0067638676</average>
                    <std>0.07986435</std>
                </statistics>
                <pixel_spacing>
                    <x units="Å">0.8349999</x>
                    <y units="Å">0.8349999</y>
                    <z units="Å">0.8349999</z>
                </pixel_spacing>
                <contour_list>
                    <contour primary="true">
                        <source>AUTHOR</source>
                    </contour>
                </contour_list>
                <label>::::EMDATABANK.org::::EMD-22995::::</label>
                <annotation_details>Spike protein trimer in the closed conformation, half-map B from non-uniform refinement in cryoSPARC v2.15</annotation_details>
            </half_map>
        </half_map_list>
    </interpretation>
</emd>