<?xml version="1.0" encoding="UTF-8"?>
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    <admin>
        <current_status>
            <date>2024-01-17</date>
            <code>REL</code>
            <processing_site>RCSB</processing_site>
        </current_status>
        <sites>
            <deposition>RCSB</deposition>
            <last_processing>RCSB</last_processing>
        </sites>
        <key_dates>
            <deposition>2021-12-23</deposition>
            <header_release>2022-03-09</header_release>
            <map_release>2022-03-09</map_release>
            <update>2024-01-17</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>R01AI140868</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>R01GM099989</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>R01AI143563</code>
                <country>United States</country>
            </grant_reference>
        </grant_support>
        <title>Sub-tomogram averaged map of HIV-Env with Gag layer from immature VLPs</title>
        <authors_list>
            <author ORCID="0000-0002-4215-5700">Mangala Prasad V</author>
            <author ORCID="0000-0001-5577-9873">Lee KK</author>
        </authors_list>
        <keywords>HIV-1, envelope protein, glycoprotein, Env, membrane bound, VIRAL PROTEIN, Gag</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author order="1">Mangala Prasad V</author>
                    <author order="2">Leaman DP</author>
                    <author order="3">Lovendahl KN</author>
                    <author order="4">Croft JT</author>
                    <author order="5">Benhaim MA</author>
                    <author order="6">Hodge EA</author>
                    <author order="7">Zwick MB</author>
                    <author order="8">Lee KK</author>
                    <title>Cryo-ET of Env on intact HIV virions reveals structural variation and positioning on the Gag lattice.</title>
                    <journal_abbreviation>Cell</journal_abbreviation>
                    <volume>185</volume>
                    <first_page>641</first_page>
                    <last_page>653.e17</last_page>
                    <year>2022</year>
                    <external_references type="PUBMED">35123651</external_references>
                    <external_references type="DOI">doi:10.1016/j.cell.2022.01.013</external_references>
                    <external_references type="ISSN">1097-4172</external_references>
                </journal_citation>
            </primary_citation>
        </citation_list>
        <emdb_list>
            <emdb_reference>
                <emdb_id>EMD-25178</emdb_id>
                <relationship>
                    <other>other EM volume</other>
                </relationship>
                <details>C3 symmetric Env</details>
            </emdb_reference>
            <emdb_reference>
                <emdb_id>EMD-25186</emdb_id>
                <relationship>
                    <other>other EM volume</other>
                </relationship>
                <details>Asymmetric reconstruction of Env</details>
            </emdb_reference>
        </emdb_list>
    </crossreferences>
    <sample>
        <name>Human immunodeficiency virus 1</name>
        <supramolecule_list>
            <virus_supramolecule supramolecule_id="1">
                <name>Human immunodeficiency virus 1</name>
                <parent>0</parent>
                <macromolecule_list>
                    <macromolecule>
                        <macromolecule_id>1</macromolecule_id>
                    </macromolecule>
                </macromolecule_list>
                <details>HIV-1 ADA.CM Env glycoprotein displayed on high Env expressing VLPs</details>
                <sci_species_name ncbi="11676">Human immunodeficiency virus 1</sci_species_name>
                <natural_host database="NCBI">
                    <organism ncbi="9606">Homo sapiens</organism>
                    <strain>ADA.CM</strain>
                </natural_host>
                <molecular_weight>
                    <theoretical units="MDa">0.4</theoretical>
                </molecular_weight>
                <virus_shell shell_id="1">
                    <name>Outer membrane envelope</name>
                    <diameter units="Å">1000.0</diameter>
                </virus_shell>
                <virus_type>VIRUS-LIKE PARTICLE</virus_type>
                <virus_isolate>STRAIN</virus_isolate>
                <virus_enveloped>true</virus_enveloped>
                <virus_empty>false</virus_empty>
            </virus_supramolecule>
        </supramolecule_list>
    </sample>
    <structure_determination_list>
        <structure_determination structure_determination_id="1">
            <method>subtomogramAveraging</method>
            <aggregation_state>particle</aggregation_state>
            <specimen_preparation_list>
                <subtomogram_averaging_preparation preparation_id="1">
                    <buffer>
                        <ph>7.4</ph>
                        <component>
                            <concentration units="X">1.0</concentration>
                            <name>Phosphate buffer saline</name>
                        </component>
                        <details>1X PBS at pH 7.4</details>
                    </buffer>
                    <grid>
                        <model>Quantifoil R1.2/1.3</model>
                        <material>COPPER</material>
                        <mesh>400</mesh>
                        <support_film film_type_id="1">
                            <film_material>CARBON</film_material>
                            <film_topology>HOLEY</film_topology>
                        </support_film>
                        <pretreatment>
                            <type>GLOW DISCHARGE</type>
                            <time units="s">30</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>
                        <details>3ul sample, blotting time of 4-5 seconds. </details>
                    </vitrification>
                    <details>Immature VLP particles displaying nearly full-length Env glycoprotein on membrane surface</details>
                </subtomogram_averaging_preparation>
            </specimen_preparation_list>
            <microscopy_list>
                <subtomogram_averaging_microscopy microscopy_id="1">
                    <microscope>FEI TITAN KRIOS</microscope>
                    <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>
                    <nominal_cs units="mm">2.7</nominal_cs>
                    <nominal_defocus_min units="µm">2.5</nominal_defocus_min>
                    <nominal_defocus_max units="µm">5.0</nominal_defocus_max>
                    <nominal_magnification>58000.0</nominal_magnification>
                    <specimen_holder_model>FEI TITAN KRIOS AUTOGRID HOLDER</specimen_holder_model>
                    <cooling_holder_cryogen>NITROGEN</cooling_holder_cryogen>
                    <alignment_procedure>
                        <coma_free/>
                    </alignment_procedure>
                    <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/>
                            <average_electron_dose_per_image units="e/Å^2">2.0</average_electron_dose_per_image>
                        </image_recording>
                    </image_recording_list>
                </subtomogram_averaging_microscopy>
            </microscopy_list>
            <subtomogram_averaging_processing image_processing_id="1">
                <image_recording_id>1</image_recording_id>
                <final_reconstruction>
                    <applied_symmetry>
                        <point_group>C1</point_group>
                    </applied_symmetry>
                    <resolution units="Å" res_type="BY AUTHOR">34.0</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
                    <software_list>
                        <software>
                            <name>EMAN2</name>
                        </software>
                    </software_list>
                    <number_subtomograms_used>1520</number_subtomograms_used>
                </final_reconstruction>
                <extraction>
                    <number_tomograms>20</number_tomograms>
                    <number_images_used>1520</number_images_used>
                    <method>Volumes picked semi-automatically</method>
                    <software_list>
                        <software>
                            <name>PEET</name>
                        </software>
                    </software_list>
                    <details>Using semi-automated picking in PEET software</details>
                </extraction>
                <final_three_d_classification>
                    <software_list>
                        <software>
                            <name>EMAN2</name>
                        </software>
                    </software_list>
                </final_three_d_classification>
                <final_angle_assignment>
                    <type>OTHER</type>
                    <software_list>
                        <software>
                            <name>EMAN2</name>
                        </software>
                    </software_list>
                </final_angle_assignment>
            </subtomogram_averaging_processing>
        </structure_determination>
    </structure_determination_list>
    <map format="CCP4" size_kbytes="132">
        <file>emd_25809.map.gz</file>
        <symmetry>
            <space_group>1</space_group>
        </symmetry>
        <data_type>IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)</data_type>
        <dimensions>
            <col>32</col>
            <row>32</row>
            <sec>32</sec>
        </dimensions>
        <origin>
            <col>-16</col>
            <row>-16</row>
            <sec>-16</sec>
        </origin>
        <spacing>
            <x>32</x>
            <y>32</y>
            <z>32</z>
        </spacing>
        <cell>
            <a units="Å">330.24</a>
            <b units="Å">330.24</b>
            <c units="Å">330.24</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>-6.102888</minimum>
            <maximum>7.1097636</maximum>
            <average>0.000000004897728</average>
            <std>0.99998474</std>
        </statistics>
        <pixel_spacing>
            <x units="Å">10.32</x>
            <y units="Å">10.32</y>
            <z units="Å">10.32</z>
        </pixel_spacing>
        <contour_list>
            <contour primary="true">
                <level>0.7</level>
                <source>AUTHOR</source>
            </contour>
        </contour_list>
        <label>::::EMDATABANK.org::::EMD-25809::::</label>
        <annotation_details>Immature hVLP Env (relaxed C1 sym) with Gag layer - half map</annotation_details>
    </map>
    <interpretation>
        <modelling_list>
            <modelling>
                <initial_model>
                    <access_code>7SKA</access_code>
                    <chain>
                        <source_name>PDB</source_name>
                        <initial_model_type>experimental model</initial_model_type>
                    </chain>
                </initial_model>
                <refinement_protocol>RIGID BODY FIT</refinement_protocol>
                <details>hVLP-Env on membrane surface</details>
                <target_criteria>Correlation coefficient</target_criteria>
                <refinement_space>REAL</refinement_space>
            </modelling>
            <modelling>
                <initial_model>
                    <access_code>4USN</access_code>
                    <chain>
                        <source_name>PDB</source_name>
                        <initial_model_type>experimental model</initial_model_type>
                    </chain>
                </initial_model>
                <refinement_protocol>RIGID BODY FIT</refinement_protocol>
                <details>Gag-CA hexamer structure for inner protein layer under membrane bilayer</details>
                <target_criteria>Correlation coefficient</target_criteria>
            </modelling>
        </modelling_list>
        <additional_map_list>
            <additional_map format="CCP4" size_kbytes="132">
                <file>emd_25809_additional_1.map.gz</file>
                <symmetry>
                    <space_group>1</space_group>
                </symmetry>
                <data_type>IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)</data_type>
                <dimensions>
                    <col>32</col>
                    <row>32</row>
                    <sec>32</sec>
                </dimensions>
                <origin>
                    <col>-16</col>
                    <row>-16</row>
                    <sec>-16</sec>
                </origin>
                <spacing>
                    <x>32</x>
                    <y>32</y>
                    <z>32</z>
                </spacing>
                <cell>
                    <a units="Å">330.24</a>
                    <b units="Å">330.24</b>
                    <c units="Å">330.24</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>-6.197795</minimum>
                    <maximum>7.482768</maximum>
                    <average>0.000000004729302</average>
                    <std>0.9999847</std>
                </statistics>
                <pixel_spacing>
                    <x units="Å">10.32</x>
                    <y units="Å">10.32</y>
                    <z units="Å">10.32</z>
                </pixel_spacing>
                <contour_list>
                    <contour primary="true">
                        <source>AUTHOR</source>
                    </contour>
                </contour_list>
                <label>::::EMDATABANK.org::::EMD-25809::::</label>
                <annotation_details>Immature hVLP Env (relaxed C1 sym) with Gag layer - full combined map</annotation_details>
            </additional_map>
        </additional_map_list>
    </interpretation>
</emd>
