<emd xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" emdb_id="EMD-8714" 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>2018-02-14</date>
            <code>REL</code>
            <processing_site>RCSB</processing_site>
        </current_status>
        <sites>
            <deposition>RCSB</deposition>
            <last_processing>RCSB</last_processing>
        </sites>
        <key_dates>
            <deposition>2017-04-28</deposition>
            <header_release>2017-06-14</header_release>
            <map_release>2017-07-26</map_release>
            <update>2018-02-14</update>
        </key_dates>
        <title>Cryo-EM reconstruction of B41 SOSIP.664</title>
        <authors_list>
            <author>Pallesen J</author>
            <author>Ozorowski G</author>
            <author>de Val N</author>
            <author>Ward AB</author>
        </authors_list>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author order="1">Ozorowski G</author>
                    <author order="2">Pallesen J</author>
                    <author order="3">de Val N</author>
                    <author order="4">Lyumkis D</author>
                    <author order="5">Cottrell CA</author>
                    <author order="6">Torres JL</author>
                    <author order="7">Copps J</author>
                    <author order="8">Stanfield RL</author>
                    <author order="9">Cupo A</author>
                    <author order="10">Pugach P</author>
                    <author order="11">Moore JP</author>
                    <author order="12">Wilson IA</author>
                    <author order="13">Ward AB</author>
                    <title>Open and closed structures reveal allostery and pliability in the HIV-1 envelope spike.</title>
                    <journal_abbreviation>Nature</journal_abbreviation>
                    <country>UK</country>
                    <volume>547</volume>
                    <first_page>360</first_page>
                    <last_page>363</last_page>
                    <year>2017</year>
                    <external_references type="PUBMED">28700571</external_references>
                    <external_references type="DOI">doi:10.1038/nature23010</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>
        </citation_list>
        <emdb_list>
            <emdb_reference>
                <emdb_id>EMD-8714</emdb_id>
                <relationship>
                    <other>associated EM volume</other>
                </relationship>
                <details>Cryo-EM model of B41 SOSIP.664 in complex with soluble CD4 (D1-D2) and fragment antigen binding variable domain of 17b</details>
            </emdb_reference>
            <emdb_reference>
                <emdb_id>EMD-8715</emdb_id>
                <relationship>
                    <other>other EM volume</other>
                </relationship>
            </emdb_reference>
            <emdb_reference>
                <emdb_id>EMD-8716</emdb_id>
                <relationship>
                    <other>other EM volume</other>
                </relationship>
            </emdb_reference>
            <emdb_reference>
                <emdb_id>EMD-8717</emdb_id>
                <relationship>
                    <other>other EM volume</other>
                </relationship>
            </emdb_reference>
            <emdb_reference>
                <emdb_id>EMD-8713</emdb_id>
                <relationship>
                    <other>other EM volume</other>
                </relationship>
            </emdb_reference>
        </emdb_list>
    </crossreferences>
    <sample>
        <name>HIV-1 Env B41 SOSIP.664</name>
        <supramolecule_list>
            <complex_supramolecule supramolecule_id="1">
                <name>HIV-1 Env B41 SOSIP.664</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="11676">Human immunodeficiency virus 1</organism>
                </natural_source>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="9606">homo sapiens</recombinant_organism>
                    <recombinant_cell>HEK293F</recombinant_cell>
                </recombinant_expression>
                <molecular_weight>
                    <theoretical units="MDa">0.48</theoretical>
                </molecular_weight>
            </complex_supramolecule>
        </supramolecule_list>
        <macromolecule_list>
            <protein_or_peptide macromolecule_id="1">
                <name>HIV-1 Env B41 SOSIP.664 gp41</name>
                <natural_source database="NCBI">
                    <organism ncbi="11676">Human immunodeficiency virus 1</organism>
                    <strain>9032-08.A1.4685</strain>
                </natural_source>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="9606">Homo sapiens</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>AVGLGA FILGFLGAAG
     STMGAASMAL TVQARLLLSG IVQQQNNLLR APEAQQHMLQ LTVWGIKQLQ ARVLAVERYL
     RDQQLLGIWG CSGKIICCTN VPWNDSWSNK TINEIWDNMT WMQWEKEIDN YTQHIYTLLE
     VSQIQQEKNE QELLELD</string>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="2">
                <name>HIV-1 Env B41 SOSIP.664 gp120</name>
                <natural_source database="NCBI">
                    <organism ncbi="11676">Human immunodeficiency virus 1</organism>
                    <strain>9032-08.A1.4685</strain>
                </natural_source>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="9606">Homo sapiens</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MDAMKRGLCC VLLLCGAVFV SPSQEIHARF RRGARAAKKW VTVYYGVPVW KEATTTLFCA
     SDAKAYDTEV HNVWATHACV PTDPNPQEIV LGNVTENFNM WKNNMVEQMH EDIISLWDQS
     LKPCVKLTPL CVTLNCNNVN TNNTNNSTNA TISDWEKMET GEMKNCSFNV TTSIRDKIKK
     EYALFYKLDV VPLENKNNIN NTNITNYRLI NCNTSVITQA CPKVSFEPIP IHYCAPAGFA
     ILKCNSKTFN GSGPCTNVST VQCTHGIRPV VSTQLLLNGS LAEEEIVIRS ENITDNAKTI
     IVQLNEAVEI NCTRPNNNTR KSIHIGPGRA FYATGDIIGN IRQAHCNISK ARWNETLGQI
     VAKLEEQFPN KTIIFNHSSG GDPEIVTHSF NCGGEFFYCN TTPLFNSTWN NTRTDDYPTG
     GEQNITLQCR IKQIINMWQG VGKAMYAPPI RGQIRCSSNI TGLLLTRDGG RDQNGTETFR
     PGGGNMRDNW RSELYKYKVV KIEPLGIAPT ACKRRVVQRRRR</string>
                </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">
                    <concentration units="mg/mL">4</concentration>
                    <buffer>
                        <ph>7.4</ph>
                        <component>
                            <concentration units="mM">150.0</concentration>
                            <formula>NaCl</formula>
                            <name>sodium chloride</name>
                        </component>
                        <component>
                            <concentration units="mM">50.0</concentration>
                            <name>Tris</name>
                        </component>
                        <component>
                            <concentration units="mM">0.06</concentration>
                            <name>DDM</name>
                        </component>
                        <details>DDM was added to a final concentration of 0.06 mM prior to vitrification</details>
                    </buffer>
                    <grid>
                        <model>C-flat-2/2</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>PLASMA CLEANING</type>
                            <atmosphere>OTHER</atmosphere>
                        </pretreatment>
                    </grid>
                    <vitrification>
                        <cryogen_name>ETHANE</cryogen_name>
                        <chamber_temperature units="K">277</chamber_temperature>
                        <instrument>HOMEMADE PLUNGER</instrument>
                        <details>3 uL of sample applied to a holey carbon grid on glow discharged face and blotted manually on sample side until filter paper detached from grid, followed by immediate plunging. </details>
                    </vitrification>
                    <details>B41 SOSIP.664 was purified by size exclusion chromatography, and concentrated prior to grid application</details>
                </single_particle_preparation>
            </specimen_preparation_list>
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                <single_particle_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">70.0</c2_aperture_diameter>
                    <nominal_cs units="mm">2.7</nominal_cs>
                    <nominal_defocus_min units="&#181;m">1.0</nominal_defocus_min>
                    <nominal_defocus_max units="&#181;m">4.5</nominal_defocus_max>
                    <nominal_magnification>22500.</nominal_magnification>
                    <calibrated_magnification>38168.</calibrated_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>
                                <dimensions>
                                    <width units="pixel">4096</width>
                                    <height units="pixel">4096</height>
                                </dimensions>
                                <sampling_interval units="&#181;m">0.000131</sampling_interval>
                                <frames_per_image>1-35</frames_per_image>
                            </digitization_details>
                            <number_real_images>2042</number_real_images>
                            <average_exposure_time units="s">7.0</average_exposure_time>
                            <average_electron_dose_per_image units="e/&#8491;^2">41.0</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>
                <ctf_correction>
                    <software_list>
                        <software>
                            <name>CTFFIND3</name>
                        </software>
                    </software_list>
                </ctf_correction>
                <final_reconstruction>
                    <applied_symmetry>
                        <point_group>C3</point_group>
                    </applied_symmetry>
                    <resolution res_type="BY AUTHOR" units="&#8491;">5.6</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
                    <software_list>
                        <software>
                            <name>RELION</name>
                            <version>2.0</version>
                        </software>
                    </software_list>
                    <number_images_used>42541</number_images_used>
                </final_reconstruction>
                <initial_angle_assignment>
                    <type>PROJECTION MATCHING</type>
                    <projection_matching_processing>
                        <angular_sampling units="degrees">7.5</angular_sampling>
                    </projection_matching_processing>
                    <software_list>
                        <software>
                            <name>RELION</name>
                            <version>2.0</version>
                        </software>
                    </software_list>
                </initial_angle_assignment>
                <final_angle_assignment>
                    <type>PROJECTION MATCHING</type>
                    <projection_matching_processing>
                        <angular_sampling units="degrees">1.88</angular_sampling>
                    </projection_matching_processing>
                    <software_list>
                        <software>
                            <name>RELION</name>
                            <version>2.0</version>
                        </software>
                    </software_list>
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                    <software_list>
                        <software>
                            <name>RELION</name>
                            <version>2.0</version>
                        </software>
                    </software_list>
                </final_three_d_classification>
            </singleparticle_processing>
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