<emd xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" emdb_id="EMD-3482" version="3.0.0.0" xsi:schemaLocation="https://github.com/emdb-empiar/emdb-schemas/blob/master/v3/v3_0_0_0/emdb.xsd">
    <admin>
        <current_status>
            <date>2017-08-30</date>
            <code>REL</code>
            <processing_site>PDBe</processing_site>
        </current_status>
        <sites>
            <deposition>PDBe</deposition>
            <last_processing>PDBe</last_processing>
        </sites>
        <key_dates>
            <deposition>2016-11-10</deposition>
            <header_release>2016-12-28</header_release>
            <map_release>2016-12-28</map_release>
            <update>2017-08-30</update>
        </key_dates>
        <title>The structure of the mature HIV-1 CA hexameric lattice with curvature parameters: tilt=23, twist=6</title>
        <authors_list>
            <author>Mattei S</author>
            <author>Glass B</author>
            <author>Hagen WJH</author>
            <author>Kraeusslich H-G</author>
            <author>Briggs JAG</author>
        </authors_list>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author order="1">Mattei S</author>
                    <author order="2">Glass B</author>
                    <author order="3">Hagen WJ</author>
                    <author order="4">Krausslich HG</author>
                    <author order="5">Briggs JA</author>
                    <title>The structure and flexibility of conical HIV-1 capsids determined within intact virions.</title>
                    <journal_abbreviation>Science</journal_abbreviation>
                    <country>US</country>
                    <volume>354</volume>
                    <first_page>1434</first_page>
                    <last_page>1437</last_page>
                    <year>2016</year>
                    <external_references type="PUBMED">27980210</external_references>
                    <external_references type="DOI">doi:10.1126/science.aah4972</external_references>
                    <external_references type="ISSN">1095-9203</external_references>
                    <external_references type="CSD">0038</external_references>
                    <external_references type="ASTM">SCIEAS</external_references>
                </journal_citation>
            </primary_citation>
        </citation_list>
        <emdb_list>
            <emdb_reference>
                <emdb_id>EMD-3482</emdb_id>
                <relationship>
                    <other>associated EM volume</other>
                </relationship>
                <details>The structure of the mature HIV-1 CA hexameric lattice with curvature parameters: tilt=23, twist=6</details>
            </emdb_reference>
        </emdb_list>
        <pdb_list>
            <pdb_reference>
                <pdb_id>5mdd</pdb_id>
                <relationship>
                    <in_frame>FULLOVERLAP</in_frame>
                </relationship>
            </pdb_reference>
        </pdb_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>
                        <macromolecule_id>2</macromolecule_id>
                    </macromolecule>
                </macromolecule_list>
                <details>HIV-1 particles were produced by infection of MT-4 cells with HIV-1 strain NL43 by coculture.</details>
                <sci_species_name ncbi="11676">Human immunodeficiency virus 1</sci_species_name>
                <natural_host database="NCBI">
                    <organism ncbi="9606">Homo sapiens</organism>
                </natural_host>
                <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>Gag protein</name>
                <natural_source database="NCBI">
                    <organism ncbi="11676">Human immunodeficiency virus 1</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.008370568</theoretical>
                </molecular_weight>
                <number_of_copies>8</number_of_copies>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>TSILDIRQGPKEPFRDYVDRFYKTLRAEQASQEVKNWMTETLLVQNANPDCKTILKALGPGATLEEMMTACQGV</string>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="2">
                <name>Gag protein</name>
                <natural_source database="NCBI">
                    <organism ncbi="11676">Human immunodeficiency virus 1</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.016301689</theoretical>
                </molecular_weight>
                <number_of_copies>6</number_of_copies>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>PIVQNLQGQMVHQAISPRTLNAWVKVVEEKAFSPEVIPMFSALSEGATPQDLNTMLNTVGGHQAAMQMLKETINEEAAEW
DRLHPVHAGPIAPGQMREPRGSDIAGTTSTLQEQIGWMTHNPPIPVGEIYKRWIILGLNKIVRMYSP</string>
                </sequence>
            </protein_or_peptide>
        </macromolecule_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>
                            <name>PBS</name>
                        </component>
                    </buffer>
                    <grid>
                        <model>C-flat</model>
                        <material>COPPER</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>
                    <vitrification>
                        <cryogen_name>ETHANE</cryogen_name>
                        <chamber_humidity units="percentage">100</chamber_humidity>
                        <chamber_temperature units="K">292</chamber_temperature>
                        <instrument>FEI VITROBOT MARK II</instrument>
                        <details>10nm colloidal gold was added to the sample prior to plunge freezing. </details>
                    </vitrification>
                    <details>Viral particles were purified from cell culture supernatant by iodixanol gradient centrifugation.</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>
                    <c2_aperture_diameter units="&#181;m">50.0</c2_aperture_diameter>
                    <nominal_cs units="mm">2.7</nominal_cs>
                    <nominal_defocus_min units="&#181;m">2.0</nominal_defocus_min>
                    <nominal_defocus_max units="&#181;m">6.5</nominal_defocus_max>
                    <nominal_magnification>81000.</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 Quantum LS</name>
                            <lower_energy_threshold units="eV">0</lower_energy_threshold>
                            <upper_energy_threshold units="eV">20</upper_energy_threshold>
                        </energy_filter>
                    </specialist_optics>
                    <details>Nanoprobe</details>
                    <image_recording_list>
                        <image_recording image_recording_id="1">
                            <film_or_detector_model>GATAN K2 QUANTUM (4k x 4k)</film_or_detector_model>
                            <detector_mode>SUPER-RESOLUTION</detector_mode>
                            <digitization_details>
                                <dimensions>
                                    <width units="pixel">3710</width>
                                    <height units="pixel">3838</height>
                                </dimensions>
                            </digitization_details>
                            <number_grids_imaged>1</number_grids_imaged>
                            <average_electron_dose_per_image units="e/&#8491;^2">2.2</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>
                <details>Frames were aligned using MotionCorr.
Tilts in a tilt series were exposure filtered for cumulative electron dose. Tomograms were reconstructed using IMOD.</details>
                <final_reconstruction>
                    <number_classes_used>1</number_classes_used>
                    <applied_symmetry>
                        <point_group>C1</point_group>
                    </applied_symmetry>
                    <resolution res_type="BY AUTHOR" units="&#8491;">8.5</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
                    <software_list>
                        <software>
                            <name>AV3</name>
                        </software>
                        <software>
                            <name>TOM Toolbox</name>
                        </software>
                    </software_list>
                    <details>The final reconstruction is obtained by averaging, without further alignment, subtomograms that were selected based on the local curvature of the hexameric lattice. This reconstruction has hexamer-hexamer curvature parameters: tilt=23, twist=6.</details>
                    <number_subtomograms_used>12211</number_subtomograms_used>
                </final_reconstruction>
                <extraction>
                    <number_tomograms>103</number_tomograms>
                    <number_images_used>652618</number_images_used>
                    <reference_model>reference free</reference_model>
                    <details>Subtomograms were extracted along the manually rendered core surface of each viral particle.</details>
                </extraction>
                <ctf_correction>
                    <software_list>
                        <software>
                            <name>IMOD</name>
                        </software>
                    </software_list>
                    <details>CTF correction was performed using the ctfphaseflip program in IMOD prior to backprojection.</details>
                </ctf_correction>
                <final_angle_assignment>
                    <type>OTHER</type>
                    <software_list>
                        <software>
                            <name>AV3</name>
                        </software>
                        <software>
                            <name>TOM Toolbox</name>
                        </software>
                    </software_list>
                    <details>Cross-correlation based template matching.</details>
                </final_angle_assignment>
            </subtomogram_averaging_processing>
        </structure_determination>
    </structure_determination_list>
    <map format="CCP4" size_kbytes="16385">
        <file>emd_3482.map.gz</file>
        <symmetry>
            <space_group>1</space_group>
        </symmetry>
        <data_type>IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)</data_type>
        <dimensions>
            <col>160</col>
            <row>160</row>
            <sec>160</sec>
        </dimensions>
        <origin>
            <col>0</col>
            <row>0</row>
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        </origin>
        <spacing>
            <x>160</x>
            <y>160</y>
            <z>160</z>
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        <cell>
            <a units="&#8491;">284.8</a>
            <b units="&#8491;">284.8</b>
            <c units="&#8491;">284.8</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>-0.30838963</minimum>
            <maximum>0.5469737</maximum>
            <average>0.00013600333</average>
            <std>0.048028905</std>
        </statistics>
        <pixel_spacing>
            <x units="&#8491;">1.78</x>
            <y units="&#8491;">1.78</y>
            <z units="&#8491;">1.78</z>
        </pixel_spacing>
        <contour_list>
            <contour primary="true">
                <level>0.2</level>
                <source>AUTHOR</source>
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        <label>::::EMDATABANK.org::::EMD-3482::::</label>
        <annotation_details>The structure of the mature HIV-1 CA hexameric lattice with curvature parameters: tilt=23, twist=6</annotation_details>
    </map>
    <interpretation>
        <modelling_list>
            <modelling>
                <refinement_protocol>RIGID BODY FIT</refinement_protocol>
                <target_criteria>Cross-correlation coefficient</target_criteria>
                <refinement_space>REAL</refinement_space>
            </modelling>
        </modelling_list>
    </interpretation>
</emd>