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        <sites>
            <deposition>PDBe</deposition>
            <last_processing>PDBe</last_processing>
        </sites>
        <key_dates>
            <deposition>2024-10-10</deposition>
            <header_release>2024-12-04</header_release>
            <map_release>2024-12-04</map_release>
            <update>2025-04-16</update>
        </key_dates>
        <grant_support>
            <grant_reference>
                <funding_body>German Research Foundation (DFG)</funding_body>
                <code>240245660 - SFB 1129 (project 5 HGK, project 6 BM, project 931 21 JAGB)</code>
                <country>Germany</country>
            </grant_reference>
            <grant_reference>
                <funding_body>German Research Foundation (DFG)</funding_body>
                <code>DFG KR 906/7-1 (HGK)</code>
                <country>Germany</country>
            </grant_reference>
            <grant_reference>
                <funding_body>National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)</funding_body>
                <code>T32 AI055403</code>
                <country>United States</country>
            </grant_reference>
            <grant_reference>
                <funding_body>Max Planck Society</funding_body>
                <country>Germany</country>
            </grant_reference>
        </grant_support>
        <title>Mature HIV-1 matrix from MA-SP1 cleavage mutant</title>
        <authors_list>
            <author>Stacey JCV</author>
            <author>Hrebik D</author>
            <author>Briggs JAG</author>
        </authors_list>
        <keywords>HIV-1, HIV, matrix, mature, spacer peptide 2, SP2, VIRAL PROTEIN</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author order="1">Stacey JCV</author>
                    <author order="2">Hrebik D</author>
                    <author order="3">Nand E</author>
                    <author order="4">Shetty SD</author>
                    <author order="5">Qu K</author>
                    <author order="6">Boicu M</author>
                    <author order="7">Anders-Osswein M</author>
                    <author order="8">Uchil PD</author>
                    <author order="9">Dick RA</author>
                    <author order="10">Mothes W</author>
                    <author order="11">Krausslich HG</author>
                    <author order="12">Muller B</author>
                    <author order="13">Briggs JAG</author>
                    <title>The conserved HIV-1 spacer peptide 2 triggers matrix lattice maturation.</title>
                    <journal_abbreviation>Nature</journal_abbreviation>
                    <country>UK</country>
                    <volume>640</volume>
                    <first_page>258</first_page>
                    <last_page>264</last_page>
                    <year>2025</year>
                    <external_references type="PUBMED">40011770</external_references>
                    <external_references type="DOI">doi:10.1038/s41586-025-08624-9</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>
            </primary_citation>
            <secondary_citation>
                <journal_citation published="true">
                    <author ORCID="0000-0003-2484-8738" order="14">Stacey JCV</author>
                    <author ORCID="0000-0003-4568-0196" order="15">Hrebik D</author>
                    <author ORCID="0000-0003-4816-9449" order="16">Nand E</author>
                    <author ORCID="0009-0003-0786-9403" order="17">Shetty SD</author>
                    <author ORCID="0000-0002-3152-2237" order="18">Qu K</author>
                    <author order="19">Boicu M</author>
                    <author order="20">Anders-Osswein M</author>
                    <author ORCID="0000-0003-3693-2531" order="21">Dick RA</author>
                    <author ORCID="0000-0002-3367-7240" order="22">Mothes W</author>
                    <author ORCID="0000-0002-8756-329X" order="23">Krausslich HG</author>
                    <author ORCID="0000-0001-5726-5585" order="24">Muller B</author>
                    <author ORCID="0000-0003-3990-6910" order="25">Briggs JAG</author>
                    <title>The conserved HIV-1 spacer peptide 2 triggers matrix lattice maturation.</title>
                    <journal_abbreviation>Biorxiv</journal_abbreviation>
                    <country>US</country>
                    <year>2024</year>
                    <external_references type="PUBMED">39574591</external_references>
                    <external_references type="DOI">doi:10.1101/2024.11.06.622200</external_references>
                    <external_references type="ISSN">2692-8205</external_references>
                </journal_citation>
            </secondary_citation>
        </citation_list>
        <pdb_list>
            <pdb_reference>
                <pdb_id>9h1p</pdb_id>
                <relationship>
                    <in_frame>FULLOVERLAP</in_frame>
                </relationship>
            </pdb_reference>
        </pdb_list>
    </crossreferences>
    <sample>
        <name>HIV-1 vector pNL4-3</name>
        <supramolecule_list>
            <virus_supramolecule supramolecule_id="1">
                <name>HIV-1 vector pNL4-3</name>
                <parent>0</parent>
                <macromolecule_list>
                    <macromolecule>
                        <macromolecule_id>1</macromolecule_id>
                    </macromolecule>
                    <macromolecule>
                        <macromolecule_id>2</macromolecule_id>
                    </macromolecule>
                </macromolecule_list>
                <details>HEK293T cells were transfected with pcHIV which was expressed and purified.</details>
                <sci_species_name ncbi="151458">HIV-1 vector pNL4-3</sci_species_name>
                <natural_host database="NCBI">
                    <organism ncbi="9606">Homo sapiens</organism>
                </natural_host>
                <molecular_weight>
                    <theoretical units="MDa">82</theoretical>
                </molecular_weight>
                <virus_shell shell_id="1">
                    <name>Gag</name>
                    <diameter units="Å">1200.0</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>
            <complex_supramolecule supramolecule_id="2">
                <name>HIV-1 mature matrix</name>
                <parent>1</parent>
                <macromolecule_list>
                    <macromolecule>
                        <macromolecule_id>1</macromolecule_id>
                    </macromolecule>
                    <macromolecule>
                        <macromolecule_id>2</macromolecule_id>
                    </macromolecule>
                </macromolecule_list>
                <details>HIV-1 mature matrix as a part of the MA-SP1 polypeptide, in a complex with SP2</details>
                <natural_source database="NCBI">
                    <organism ncbi="151458">HIV-1 vector pNL4-3</organism>
                </natural_source>
            </complex_supramolecule>
        </supramolecule_list>
        <macromolecule_list>
            <protein_or_peptide macromolecule_id="1">
                <name>Gag polyprotein</name>
                <natural_source database="NCBI">
                    <organism ncbi="11698">Human immunodeficiency virus type 1 group M subtype B (isolate NY5)</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.014734615999999999</theoretical>
                </molecular_weight>
                <number_of_copies>12</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="9606">Homo sapiens</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>GARASVLSGGELDKWEKIRLRPGGKKQYKLKHIVWASRELERFAVNPGLLETSEGCRQILGQLQPSLQTGSEELRSLYNT
IAVLYCVHQRIDVKDTKEALDKIEEEQNKSKKKAQQAAADTGNNSQVSQNY</string>
                    <external_references type="UNIPROTKB">P12493</external_references>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="2">
                <name>Gag polyprotein</name>
                <natural_source database="NCBI">
                    <organism ncbi="11698">Human immunodeficiency virus type 1 group M subtype B (isolate NY5)</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.0018451539999999999</theoretical>
                </molecular_weight>
                <details>spacer peptide 2</details>
                <number_of_copies>12</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="9606">Homo sapiens</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>FLGKIWPSHKGRPGNF</string>
                    <external_references type="UNIPROTKB">P12493</external_references>
                </sequence>
            </protein_or_peptide>
        </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">
                    <buffer>
                        <ph>7.4</ph>
                        <component>
                            <concentration units="mmol/L">8.1</concentration>
                            <formula>Na2HPO4</formula>
                            <name>disodium hydrogen phosphate</name>
                        </component>
                        <component>
                            <concentration units="mmol/L">1.5</concentration>
                            <formula>KH2PO4</formula>
                            <name>potassium dihydrogen phosphate</name>
                        </component>
                        <component>
                            <concentration units="mmol/L">137.0</concentration>
                            <formula>NaCl</formula>
                            <name>sodium chloride</name>
                        </component>
                        <component>
                            <concentration units="mmol/L">2.7</concentration>
                            <formula>KCl</formula>
                            <name>potassium chloride</name>
                        </component>
                        <details>PBS</details>
                    </buffer>
                    <grid>
                        <model>Quantifoil R2/2</model>
                        <material>COPPER</material>
                        <mesh>300</mesh>
                        <support_film film_type_id="1">
                            <film_material>CARBON</film_material>
                            <film_topology>HOLEY</film_topology>
                            <film_thickness>50.0</film_thickness>
                        </support_film>
                        <pretreatment>
                            <type>GLOW DISCHARGE</type>
                            <time units="s">45</time>
                            <atmosphere>AIR</atmosphere>
                        </pretreatment>
                    </grid>
                    <vitrification>
                        <cryogen_name>ETHANE-PROPANE</cryogen_name>
                        <chamber_humidity units="percentage">100</chamber_humidity>
                        <chamber_temperature units="K">293</chamber_temperature>
                        <instrument>LEICA EM GP</instrument>
                    </vitrification>
                    <details>purified HIV-1 MA-SP1 particles in PBS</details>
                </single_particle_preparation>
            </specimen_preparation_list>
            <microscopy_list>
                <single_particle_microscopy microscopy_id="1">
                    <microscope>TFS 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="µm">50.0</c2_aperture_diameter>
                    <nominal_cs units="mm">2.7</nominal_cs>
                    <nominal_defocus_min units="µm">0.6</nominal_defocus_min>
                    <calibrated_defocus_min units="µm">0.45</calibrated_defocus_min>
                    <nominal_defocus_max units="µm">3.6</nominal_defocus_max>
                    <calibrated_defocus_max units="µm">4.5</calibrated_defocus_max>
                    <nominal_magnification>130000.0</nominal_magnification>
                    <specimen_holder_model>FEI TITAN KRIOS AUTOGRID HOLDER</specimen_holder_model>
                    <cooling_holder_cryogen>NITROGEN</cooling_holder_cryogen>
                    <temperature>
                        <temperature_min units="K">88.0</temperature_min>
                        <temperature_max units="K">93.0</temperature_max>
                    </temperature>
                    <alignment_procedure>
                        <zemlin_tableau/>
                    </alignment_procedure>
                    <specialist_optics>
                        <energy_filter>
                            <name>TFS Selectris</name>
                            <slit_width units="eV">15</slit_width>
                        </energy_filter>
                    </specialist_optics>
                    <image_recording_list>
                        <image_recording image_recording_id="1">
                            <film_or_detector_model>FEI FALCON IV (4k x 4k)</film_or_detector_model>
                            <digitization_details>
                                <dimensions>
                                    <width units="pixel">4096</width>
                                    <height units="pixel">4096</height>
                                </dimensions>
                            </digitization_details>
                            <number_grids_imaged>1</number_grids_imaged>
                            <number_real_images>14222</number_real_images>
                            <average_exposure_time units="s">4.0</average_exposure_time>
                            <average_electron_dose_per_image units="e/Å^2">40.0</average_electron_dose_per_image>
                            <details>EER mode</details>
                        </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>5704512</number_selected>
                    <details>A new model was trained in crYOLO using a training dataset annotated in a randomly selected set of 50-100 micrographs. Annotation was performed in the crYOLO boxmanager GUI placing positions all over the visible surface of an HIV virus particle. The picks did not distinguish individual proteins or membranes.</details>
                </particle_selection>
                <startup_model type_of_model="EMDB MAP">
                    <emdb_id>EMD-13088</emdb_id>
                </startup_model>
                <final_reconstruction>
                    <applied_symmetry>
                        <point_group>C3</point_group>
                    </applied_symmetry>
                    <algorithm>BACK PROJECTION</algorithm>
                    <resolution units="Å" res_type="BY AUTHOR">3.1</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
                    <software_list>
                        <software>
                            <name>cryoSPARC</name>
                            <version>4.3</version>
                        </software>
                    </software_list>
                    <number_images_used>5486693</number_images_used>
                </final_reconstruction>
                <initial_angle_assignment>
                    <type>MAXIMUM LIKELIHOOD</type>
                    <software_list>
                        <software>
                            <name>cryoSPARC</name>
                            <version>4.3</version>
                        </software>
                    </software_list>
                </initial_angle_assignment>
                <final_angle_assignment>
                    <type>MAXIMUM LIKELIHOOD</type>
                    <software_list>
                        <software>
                            <name>cryoSPARC</name>
                            <version>4.3</version>
                        </software>
                    </software_list>
                </final_angle_assignment>
                <final_three_d_classification>
                    <number_classes>6</number_classes>
                    <average_number_members_per_class>210000.0</average_number_members_per_class>
                    <software_list>
                        <software>
                            <name>cryoSPARC</name>
                            <version>4.3</version>
                        </software>
                    </software_list>
                    <details>particle stack after 2D classification was split into 4 independent subsets and each subset was classified independently</details>
                </final_three_d_classification>
            </singleparticle_processing>
        </structure_determination>
    </structure_determination_list>
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        <file>emd_51769.map.gz</file>
        <symmetry>
            <space_group>1</space_group>
        </symmetry>
        <data_type>IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)</data_type>
        <dimensions>
            <col>512</col>
            <row>512</row>
            <sec>512</sec>
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        <spacing>
            <x>512</x>
            <y>512</y>
            <z>512</z>
        </spacing>
        <cell>
            <a units="Å">486.4</a>
            <b units="Å">486.4</b>
            <c units="Å">486.4</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>
        </axis_order>
        <statistics>
            <minimum>-1.3631687</minimum>
            <maximum>2.2647994</maximum>
            <average>-0.00377327</average>
            <std>0.03979854</std>
        </statistics>
        <pixel_spacing>
            <x units="Å">0.95</x>
            <y units="Å">0.95</y>
            <z units="Å">0.95</z>
        </pixel_spacing>
        <contour_list>
            <contour primary="true">
                <level>0.25</level>
                <source>AUTHOR</source>
            </contour>
        </contour_list>
        <label>::::EMDATABANK.org::::EMD-51769::::</label>
        <annotation_details>Sharpened map of the mature HIV matrix solved from the virion of the HIV-1 MA-SP1 cleavage mutant.</annotation_details>
    </map>
    <interpretation>
        <modelling_list>
            <modelling>
                <initial_model>
                    <access_code>2H3I</access_code>
                    <chain>
                        <chain_id>A</chain_id>
                        <source_name>PDB</source_name>
                        <initial_model_type>experimental model</initial_model_type>
                    </chain>
                </initial_model>
                <refinement_protocol>FLEXIBLE FIT</refinement_protocol>
                <target_criteria>cross-correlation</target_criteria>
                <refinement_space>REAL</refinement_space>
                <overall_bvalue>52.490000000000002</overall_bvalue>
            </modelling>
        </modelling_list>
        <segmentation_list>
            <segmentation>
                <file>emd_51769_msk_1.map</file>
            </segmentation>
        </segmentation_list>
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                <file>emd_51769_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>512</col>
                    <row>512</row>
                    <sec>512</sec>
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                    <col>0</col>
                    <row>0</row>
                    <sec>0</sec>
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                <spacing>
                    <x>512</x>
                    <y>512</y>
                    <z>512</z>
                </spacing>
                <cell>
                    <a units="Å">486.4</a>
                    <b units="Å">486.4</b>
                    <c units="Å">486.4</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>
                </axis_order>
                <statistics>
                    <minimum>-0.1860875</minimum>
                    <maximum>0.41787973</maximum>
                    <average>-0.0037732697</average>
                    <std>0.023160411</std>
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                <pixel_spacing>
                    <x units="Å">0.95</x>
                    <y units="Å">0.95</y>
                    <z units="Å">0.95</z>
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                <annotation_details>Unsharpened map of the mature HIV matrix solved from the virion of the HIV-1 MA-SP1 cleavage mutant.</annotation_details>
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                <label>::::EMDATABANK.org::::EMD-51769::::</label>
                <annotation_details>Half map 2 of the mature HIV matrix solved from the virion of the HIV-1 MA-SP1 cleavage mutant.</annotation_details>
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                    <a units="Å">486.4</a>
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                    <beta units="deg">90.0</beta>
                    <gamma units="deg">90.0</gamma>
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                <label>::::EMDATABANK.org::::EMD-51769::::</label>
                <annotation_details>Half map 1 of the mature HIV matrix solved from the virion of the HIV-1 MA-SP1 cleavage mutant.</annotation_details>
            </half_map>
        </half_map_list>
    </interpretation>
</emd>
