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    <admin>
        <current_status>
            <date>2024-03-20</date>
            <code>REL</code>
            <processing_site>RCSB</processing_site>
        </current_status>
        <sites>
            <deposition>RCSB</deposition>
            <last_processing>RCSB</last_processing>
        </sites>
        <key_dates>
            <deposition>2019-02-01</deposition>
            <header_release>2019-02-27</header_release>
            <map_release>2019-05-29</map_release>
            <update>2024-03-20</update>
        </key_dates>
        <grant_support>
            <grant_reference>
                <funding_body>National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)</funding_body>
                <code>AI123498</code>
                <country>United States</country>
            </grant_reference>
            <grant_reference>
                <funding_body>National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)</funding_body>
                <code>AI127521</code>
                <country>United States</country>
            </grant_reference>
        </grant_support>
        <title>SARS-Coronavirus NSP12 bound to NSP8 co-factor</title>
        <authors_list>
            <author>Kirchdoerfer RN</author>
            <author>Ward AB</author>
        </authors_list>
        <keywords>coronavirus, polymerase, non-structural protein, VIRAL PROTEIN</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author order="1">Kirchdoerfer RN</author>
                    <author order="2">Ward AB</author>
                    <title>Structure of the SARS-CoV nsp12 polymerase bound to nsp7 and nsp8 co-factors.</title>
                    <journal_abbreviation>Nat Commun</journal_abbreviation>
                    <country>UK</country>
                    <volume>10</volume>
                    <first_page>2342</first_page>
                    <last_page>2342</last_page>
                    <year>2019</year>
                    <external_references type="PUBMED">31138817</external_references>
                    <external_references type="DOI">doi:10.1038/s41467-019-10280-3</external_references>
                    <external_references type="ISSN">2041-1723</external_references>
                </journal_citation>
            </primary_citation>
        </citation_list>
        <emdb_list>
            <emdb_reference>
                <emdb_id>EMD-0520</emdb_id>
                <relationship>
                    <other>other EM volume</other>
                </relationship>
            </emdb_reference>
        </emdb_list>
        <pdb_list>
            <pdb_reference>
                <pdb_id>6nus</pdb_id>
                <relationship>
                    <in_frame>FULLOVERLAP</in_frame>
                </relationship>
            </pdb_reference>
        </pdb_list>
    </crossreferences>
    <sample>
        <name>SARS-Coronavirus NSP12 bound to NSP7 and NSP8 co-factors</name>
        <supramolecule_list>
            <complex_supramolecule supramolecule_id="1">
                <name>SARS-Coronavirus NSP12 bound to NSP7 and NSP8 co-factors</name>
                <parent>0</parent>
                <macromolecule_list>
                    <macromolecule>
                        <macromolecule_id>1</macromolecule_id>
                    </macromolecule>
                    <macromolecule>
                        <macromolecule_id>2</macromolecule_id>
                    </macromolecule>
                </macromolecule_list>
                <natural_source database="NCBI">
                    <organism ncbi="227859">SARS coronavirus</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.13</theoretical>
                </molecular_weight>
            </complex_supramolecule>
        </supramolecule_list>
        <macromolecule_list>
            <protein_or_peptide macromolecule_id="1">
                <name>NSP12</name>
                <natural_source database="NCBI">
                    <organism ncbi="227859">Human SARS coronavirus</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.109277031</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="7108">Spodoptera frugiperda</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MGSADASTFLNRVCGVSAARLTPCGTGTSTDVVYRAFDIYNEKVAGFAKFLKTNCCRFQEKDEEGNLLDSYFVVKRHTMS
NYQHEETIYNLVKDCPAVAVHDFFKFRVDGDMVPHISRQRLTKYTMADLVYALRHFDEGNCDTLKEILVTYNCCDDDYFN
KKDWYDFVENPDILRVYANLGERVRQSLLKTVQFCDAMRDAGIVGVLTLDNQDLNGNWYDFGDFVQVAPGCGVPIVDSYY
SLLMPILTLTRALAAESHMDADLAKPLIKWDLLKYDFTEERLCLFDRYFKYWDQTYHPNCINCLDDRCILHCANFNVLFS
TVFPPTSFGPLVRKIFVDGVPFVVSTGYHFRELGVVHNQDVNLHSSRLSFKELLVYAADPAMHAASGNLLLDKRTTCFSV
AALTNNVAFQTVKPGNFNKDFYDFAVSKGFFKEGSSVELKHFFFAQDGNAAISDYDYYRYNLPTMCDIRQLLFVVEVVDK
YFDCYDGGCINANQVIVNNLDKSAGFPFNKWGKARLYYDSMSYEDQDALFAYTKRNVIPTITQMNLKYAISAKNRARTVA
GVSICSTMTNRQFHQKLLKSIAATRGATVVIGTSKFYGGWHNMLKTVYSDVETPHLMGWDYPKCDRAMPNMLRIMASLVL
ARKHNTCCNLSHRFYRLANECAQVLSEMVMCGGSLYVKPGGTSSGDATTAYANSVFNICQAVTANVNALLSTDGNKIADK
YVRNLQHRLYECLYRNRDVDHEFVDEFYAYLRKHFSMMILSDDAVVCYNSNYAAQGLVASIKNFKAVLYYQNNVFMSEAK
CWTETDLTKGPHEFCSQHTMLVKQGDDYVYLPYPDPSRILGAGCFVDDIVKTDGTLMIERFVSLAIDAYPLTKHPNQEYA
DVFHLYLQYIRKLHDELTGHMLDMYSVMLTNDNTSRYWEPEFYEAMYTPHTVLLVPRGSGHHHHHHAWSHPQFEK</string>
                    <external_references type="UNIPROTKB">P0C6X7</external_references>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="2">
                <name>NSP8</name>
                <natural_source database="NCBI">
                    <organism ncbi="227859">Human SARS coronavirus</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.02188799</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="511693">Escherichia coli BL21</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>AIASEFSSLPSYAAYATAQEAYEQAVANGDSEVVLKKLKKSLNVAKSEFDRDAAMQRKLEKMADQAMTQMYKQARSEDKR
AKVTSAMQTMLFTMLRKLDNDALNNIINNARDGCVPLNIIPLTTAAKLMVVVPDYGTYKNTCDGNTFTYASALWEIQQVV
DADSKIVQLSEINMDNSPNLAWPLIVTALRANSAVKLQ</string>
                    <external_references type="UNIPROTKB">P0C6U8</external_references>
                </sequence>
            </protein_or_peptide>
            <ligand macromolecule_id="3">
                <name>ZINC ION</name>
                <molecular_weight>
                    <theoretical units="MDa">6.5409e-05</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <formula>ZN</formula>
            </ligand>
        </macromolecule_list>
    </sample>
    <structure_determination_list>
        <structure_determination structure_determination_id="1">
            <method>singleParticle</method>
            <aggregation_state>particle</aggregation_state>
            <specimen_preparation_list>
                <single_particle_preparation preparation_id="1">
                    <concentration units="mg/mL">3.1</concentration>
                    <buffer>
                        <ph>7.4</ph>
                        <component>
                            <concentration units="mM">25.0</concentration>
                            <formula>C8H18N2O4S</formula>
                            <name>HEPES</name>
                        </component>
                        <component>
                            <concentration units="mM">300.0</concentration>
                            <formula>NaCl</formula>
                            <name>sodium chloride</name>
                        </component>
                        <component>
                            <concentration units="mM">2.0</concentration>
                            <name>TCEP</name>
                        </component>
                        <component>
                            <concentration units="mM">0.01</concentration>
                            <formula>MgCl2</formula>
                            <name>magnesium chloride</name>
                        </component>
                        <component>
                            <concentration units="mM">0.06</concentration>
                            <name>n-dodecyl-beta-D-maltopyranoside</name>
                        </component>
                        <details>n-dodecyl-beta-D-maltopyranoside was added just prior to spotting samples onto holey EM grids.</details>
                    </buffer>
                    <grid>
                        <model>Quantifoil, UltrAuFoil, R1.2/1.3</model>
                        <material>GOLD</material>
                        <mesh>300</mesh>
                        <pretreatment>
                            <type>PLASMA CLEANING</type>
                            <time units="s">7</time>
                            <atmosphere>OTHER</atmosphere>
                        </pretreatment>
                    </grid>
                    <vitrification>
                        <cryogen_name>ETHANE</cryogen_name>
                        <chamber_humidity units="percentage">100</chamber_humidity>
                        <chamber_temperature units="K">277</chamber_temperature>
                        <instrument>FEI VITROBOT MARK IV</instrument>
                    </vitrification>
                </single_particle_preparation>
            </specimen_preparation_list>
            <microscopy_list>
                <single_particle_microscopy microscopy_id="1">
                    <microscope>FEI TALOS ARCTICA</microscope>
                    <illumination_mode>FLOOD BEAM</illumination_mode>
                    <imaging_mode>BRIGHT FIELD</imaging_mode>
                    <electron_source>FIELD EMISSION GUN</electron_source>
                    <acceleration_voltage units="kV">200</acceleration_voltage>
                    <c2_aperture_diameter units="µm">70.0</c2_aperture_diameter>
                    <nominal_cs units="mm">2.7</nominal_cs>
                    <calibrated_defocus_min units="µm">0.4</calibrated_defocus_min>
                    <calibrated_defocus_max units="µm">1.0</calibrated_defocus_max>
                    <calibrated_magnification>43478.0</calibrated_magnification>
                    <specimen_holder_model>FEI TITAN KRIOS AUTOGRID HOLDER</specimen_holder_model>
                    <cooling_holder_cryogen>NITROGEN</cooling_holder_cryogen>
                    <image_recording_list>
                        <image_recording image_recording_id="1">
                            <film_or_detector_model>GATAN K2 SUMMIT (4k x 4k)</film_or_detector_model>
                            <detector_mode>COUNTING</detector_mode>
                            <digitization_details>
                                <dimensions>
                                    <width units="pixel">3838</width>
                                    <height units="pixel">3710</height>
                                </dimensions>
                                <frames_per_image>1-47</frames_per_image>
                            </digitization_details>
                            <number_grids_imaged>1</number_grids_imaged>
                            <number_real_images>1677</number_real_images>
                            <average_exposure_time units="s">11.75</average_exposure_time>
                            <average_electron_dose_per_image units="e/Å^2">50.5</average_electron_dose_per_image>
                        </image_recording>
                    </image_recording_list>
                </single_particle_microscopy>
            </microscopy_list>
            <singleparticle_processing image_processing_id="1">
                <image_recording_id>1</image_recording_id>
                <particle_selection>
                    <number_selected>2003890</number_selected>
                </particle_selection>
                <startup_model type_of_model="OTHER">
                    <details>Initial model generated using stochastic gradient descent in RELION-2.1</details>
                </startup_model>
                <final_reconstruction>
                    <applied_symmetry>
                        <point_group>C1</point_group>
                    </applied_symmetry>
                    <resolution units="Å" res_type="BY AUTHOR">3.5</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
                    <software_list>
                        <software>
                            <name>RELION</name>
                            <version>3.0</version>
                        </software>
                    </software_list>
                    <number_images_used>71262</number_images_used>
                </final_reconstruction>
                <initial_angle_assignment>
                    <type>ANGULAR RECONSTITUTION</type>
                    <software_list>
                        <software>
                            <name>RELION</name>
                            <version>3.0</version>
                        </software>
                    </software_list>
                </initial_angle_assignment>
                <final_angle_assignment>
                    <type>ANGULAR RECONSTITUTION</type>
                    <software_list>
                        <software>
                            <name>RELION</name>
                            <version>3.0</version>
                        </software>
                    </software_list>
                </final_angle_assignment>
                <final_three_d_classification>
                    <number_classes>4</number_classes>
                    <software_list>
                        <software>
                            <name>RELION</name>
                            <version>3.0</version>
                        </software>
                    </software_list>
                </final_three_d_classification>
            </singleparticle_processing>
        </structure_determination>
    </structure_determination_list>
    <map format="CCP4" size_kbytes="67109">
        <file>emd_0521.map.gz</file>
        <symmetry>
            <space_group>1</space_group>
        </symmetry>
        <data_type>IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)</data_type>
        <dimensions>
            <col>256</col>
            <row>256</row>
            <sec>256</sec>
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        <spacing>
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            <y>256</y>
            <z>256</z>
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        <cell>
            <a units="Å">294.4</a>
            <b units="Å">294.4</b>
            <c units="Å">294.4</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>
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        <statistics>
            <minimum>-0.13225228</minimum>
            <maximum>0.21131472</maximum>
            <average>0.0000064397564</average>
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        </statistics>
        <pixel_spacing>
            <x units="Å">1.15</x>
            <y units="Å">1.15</y>
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        <contour_list>
            <contour primary="true">
                <level>0.035</level>
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        </contour_list>
        <label>::::EMDATABANK.org::::EMD-0521::::</label>
        <annotation_details>SARS-Coronavirus NSP12 bound to NSP8 co-factor, merged full map</annotation_details>
    </map>
    <interpretation>
        <modelling_list>
            <modelling>
                <refinement_space>REAL</refinement_space>
            </modelling>
        </modelling_list>
        <segmentation_list>
            <segmentation>
                <file>emd_0521_msk_1.map</file>
            </segmentation>
        </segmentation_list>
        <half_map_list>
            <half_map format="CCP4" size_kbytes="67109">
                <file>emd_0521_half_map_1.map.gz</file>
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                    <space_group>1</space_group>
                </symmetry>
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                <dimensions>
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                    <row>256</row>
                    <sec>256</sec>
                </dimensions>
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                    <y>256</y>
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                    <b units="Å">294.4</b>
                    <c units="Å">294.4</c>
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                    <gamma units="deg">90.0</gamma>
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                <axis_order>
                    <fast>X</fast>
                    <medium>Y</medium>
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                <statistics>
                    <minimum>-0.049734425</minimum>
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                </contour_list>
                <label>::::EMDATABANK.org::::EMD-0521::::</label>
                <annotation_details>SARS-Coronavirus NSP12 bound to NSP8 co-factor, first half map</annotation_details>
            </half_map>
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                <file>emd_0521_half_map_2.map.gz</file>
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                    <c units="Å">294.4</c>
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                    <beta units="deg">90.0</beta>
                    <gamma units="deg">90.0</gamma>
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                <axis_order>
                    <fast>X</fast>
                    <medium>Y</medium>
                    <slow>Z</slow>
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                <statistics>
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                <pixel_spacing>
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                    <y units="Å">1.15</y>
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                <label>::::EMDATABANK.org::::EMD-0521::::</label>
                <annotation_details>SARS-Coronavirus NSP12 bound to NSP8 co-factor, second half map</annotation_details>
            </half_map>
        </half_map_list>
    </interpretation>
</emd>
