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            <last_processing>PDBe</last_processing>
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        <key_dates>
            <deposition>2020-07-28</deposition>
            <header_release>2020-08-05</header_release>
            <map_release>2020-08-05</map_release>
            <update>2020-12-30</update>
        </key_dates>
        <grant_support>
            <grant_reference>
                <funding_body>European Research Council (ERC)</funding_body>
                <code>ERC-CoG-648432</code>
                <country>European Union</country>
            </grant_reference>
            <grant_reference>
                <funding_body>Medical Research Council (MRC, United Kingdom)</funding_body>
                <code>MC_UP_A025_1013</code>
                <country>United Kingdom</country>
            </grant_reference>
            <grant_reference>
                <funding_body>Medical Research Council (MRC, United Kingdom)</funding_body>
                <code>MC_UP_1201/16</code>
                <country>United Kingdom</country>
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            <grant_reference>
                <funding_body>Japan Society for the Promotion of Science (JSPS)</funding_body>
                <country>Japan</country>
            </grant_reference>
            <grant_reference>
                <funding_body>German Research Foundation (DFG)</funding_body>
                <code>240245660-SFB 1129</code>
                <country>Germany</country>
            </grant_reference>
        </grant_support>
        <title>Subtomogram averaging of SARS-CoV-2 spike protein from unconcentrated virions: Prefusion Class (2 open RBDs)</title>
        <authors_list>
            <author>Ke Z</author>
            <author>Oton J</author>
            <author>Zivanov J</author>
            <author>Lu JM</author>
            <author>Peukes J</author>
            <author>Cortese M</author>
            <author>Zila V</author>
            <author>Scheres SHW</author>
            <author>Briggs JAG</author>
        </authors_list>
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        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author order="1">Ke Z</author>
                    <author order="2">Oton J</author>
                    <author order="3">Qu K</author>
                    <author order="4">Cortese M</author>
                    <author order="5">Zila V</author>
                    <author order="6">McKeane L</author>
                    <author order="7">Nakane T</author>
                    <author order="8">Zivanov J</author>
                    <author order="9">Neufeldt CJ</author>
                    <author order="10">Cerikan B</author>
                    <author order="11">Lu JM</author>
                    <author order="12">Peukes J</author>
                    <author order="13">Xiong X</author>
                    <author order="14">Krausslich HG</author>
                    <author order="15">Scheres SHW</author>
                    <author order="16">Bartenschlager R</author>
                    <author order="17">Briggs JAG</author>
                    <title>Structures and distributions of SARS-CoV-2 spike proteins on intact virions.</title>
                    <journal_abbreviation>Nature</journal_abbreviation>
                    <country>UK</country>
                    <volume>588</volume>
                    <first_page>498</first_page>
                    <last_page>502</last_page>
                    <year>2020</year>
                    <external_references type="PUBMED">32805734</external_references>
                    <external_references type="DOI">doi:10.1038/s41586-020-2665-2</external_references>
                    <external_references type="ISSN">1476-4687</external_references>
                    <external_references type="CSD">0006</external_references>
                    <external_references type="ASTM">NATUAS</external_references>
                </journal_citation>
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    <sample>
        <name>Severe acute respiratory syndrome coronavirus 2</name>
        <supramolecule_list>
            <virus_supramolecule supramolecule_id="1">
                <name>Severe acute respiratory syndrome coronavirus 2</name>
                <parent>0</parent>
                <macromolecule_list>
                    <macromolecule>
                        <macromolecule_id>1</macromolecule_id>
                    </macromolecule>
                </macromolecule_list>
                <details>Unconcentrated supernatant of SARS-CoV-2 virions produced from infected VeroE6 cells.</details>
                <sci_species_name ncbi="2697049">Severe acute respiratory syndrome coronavirus 2</sci_species_name>
                <virus_type>VIRION</virus_type>
                <virus_isolate>STRAIN</virus_isolate>
                <virus_enveloped>true</virus_enveloped>
                <virus_empty>false</virus_empty>
            </virus_supramolecule>
        </supramolecule_list>
        <macromolecule_list>
            <protein_or_peptide macromolecule_id="1">
                <name>SARS-CoV-2 Spike proteins on virions</name>
                <natural_source database="NCBI">
                    <organism ncbi="2697049">Severe acute respiratory syndrome coronavirus 2</organism>
                    <strain>Germany/BavPat1/2020</strain>
                </natural_source>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MFVFLVLLPLVSSQCVNLTTRTQLPPAYTNSFTRGVYYPDKVFRSSVLHSTQDLFLPFFSNVTWFHAIHVSGTNGTKRFDNPVLPFNDGVYFASTEKSNIIRGWIFGTTLDSKTQSLLIVNNATNVVIKVCEFQFCNDPFLGVYYHKNNKSWMESEFRVYSSANNCTFEYVSQPFLMDLEGKQGNFKNLREFVFKNIDGYFKIYSKHTPINLVRDLPQGFSALEPLVDLPIGINITRFQTLLALHRSYLTPGDSSSGWTAGAAAYYVGYLQPRTFLLKYNENGTITDAVDCALDPLSETKCTLKSFTVEKGIYQTSNFRVQPTESIVRFPNITNLCPFGEVFNATRFASVYAWNRKRISNCVADYSVLYNSASFSTFKCYGVSPTKLNDLCFTNVYADSFVIRGDEVRQIAPGQTGKIADYNYKLPDDFTGCVIAWNSNNLDSKVGGNYNYLYRLFRKSNLKPFERDISTEIYQAGSTPCNGVEGFNCYFPLQSYGFQPTNGVGYQPYRVVVLSFELLHAPATVCGPKKSTNLVKNKCVNFNFNGLTGTGVLTESNKKFLPFQQFGRDIADTTDAVRDPQTLEILDITPCSFGGVSVITPGTNTSNQVAVLYQGVNCTEVPVAIHADQLTPTWRVYSTGSNVFQTRAGCLIGAEHVNNSYECDIPIGAGICASYQTQTNSPRRARSVASQSIIAYTMSLGAENSVAYSNNSIAIPTNFTISVTTEILPVSMTKTSVDCTMYICGDSTECSNLLLQYGSFCTQLNRALTGIAVEQDKNTQEVFAQVKQIYKTPPIKDFGGFNFSQILPDPSKPSKRSFIEDLLFNKVTLADAGFIKQYGDCLGDIAARDLICAQKFNGLTVLPPLLTDEMIAQYTSALLAGTITSGWTFGAGAALQIPFAMQMAYRFNGIGVTQNVLYENQKLIANQFNSAIGKIQDSLSSTASALGKLQDVVNQNAQALNTLVKQLSSNFGAISSVLNDILSRLDKVEAEVQIDRLITGRLQSLQTYVTQQLIRAAEIRASANLAATKMSECVLGQSKRVDFCGKGYHLMSFPQSAPHGVVFLHVTYVPAQEKNFTTAPAICHDGKAHFPREGVFVSNGTHWFVTQRNFYEPQIITTDNTFVSGNCDVVIGIVNNTVYDPLQPELDSFKEE(NAG)(NAG)(NAG)(NAG)(NAG)(NAG)(NAG)(NAG)(NAG)(NAG)(NAG)(NAG)(NAG)(NAG)(NAG)(NAG)(NAG)(NAG)(NAG)(NAG)(NAG)LDKYFKNHTSPDVDLGDISGINASVVNIQKEIDRLNEVAKNLNESLIDLQELGKYEQYIKWPWYIWLGFIAGLIAIVMVTIMLCCMTSCCSCLKGCCSCGSCCKFDEDDSEPVLKGVKLHYT</string>
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                            <average_exposure_time units="s">1.25</average_exposure_time>
                            <average_electron_dose_per_image units="e/Å^2">3.0</average_electron_dose_per_image>
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                    <applied_symmetry>
                        <point_group>C1</point_group>
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                    <resolution units="Å" res_type="BY AUTHOR">9.9</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
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                    <number_subtomograms_used>525</number_subtomograms_used>
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                    <number_tomograms>156</number_tomograms>
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                        <software>
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                    </software_list>
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Relion
dedicated python scripts</details>
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                <ctf_correction>
                    <software_list>
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Relion
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