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                            <item>_em_admin.last_update</item>
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        <sites>
            <deposition>PDBe</deposition>
            <last_processing>PDBe</last_processing>
        </sites>
        <key_dates>
            <deposition>2022-08-19</deposition>
            <header_release>2023-03-15</header_release>
            <map_release>2023-03-15</map_release>
            <update>2025-10-01</update>
        </key_dates>
        <grant_support>
            <grant_reference>
                <funding_body>European Research Council (ERC)</funding_body>
                <code>854126</code>
                <country>European Union</country>
            </grant_reference>
            <grant_reference>
                <funding_body>Biotechnology and Biological Sciences Research Council (BBSRC)</funding_body>
                <code>BB/M000265/1</code>
                <country>United Kingdom</country>
            </grant_reference>
            <grant_reference>
                <funding_body>Wellcome Trust</funding_body>
                <code>nr29785</code>
                <country>United Kingdom</country>
            </grant_reference>
            <grant_reference>
                <funding_body>Royal Society</funding_body>
                <code>URF/R1/19154</code>
                <country>United Kingdom</country>
            </grant_reference>
            <grant_reference>
                <funding_body>Biotechnology and Biological Sciences Research Council (BBSRC)</funding_body>
                <code>BB/V006630/1</code>
                <country>United Kingdom</country>
            </grant_reference>
        </grant_support>
        <title>Four subunit cytochrome b-c1 complex from Rhodobacter sphaeroides in native nanodiscs - consensus refinement in the b-b conformation</title>
        <authors_list>
            <author>Swainsbury DJK</author>
            <author>Hawkings FR</author>
            <author>Martin EC</author>
            <author>Musial S</author>
            <author>Salisbury JH</author>
            <author>Jackson PJ</author>
            <author>Farmer DA</author>
            <author>Johnson MP</author>
            <author>Siebert CA</author>
            <author>Hitchcock A</author>
            <author>Hunter CN</author>
        </authors_list>
        <keywords>cyt bc1 complex III membrane protein electron transport quinone cytochrome, OXIDOREDUCTASE</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author ORCID="0000-0002-0754-0363" order="1">Swainsbury DJK</author>
                    <author order="2">Hawkings FR</author>
                    <author order="3">Martin EC</author>
                    <author ORCID="0000-0003-4466-5939" order="4">Musial S</author>
                    <author order="5">Salisbury JH</author>
                    <author ORCID="0000-0001-9671-2472" order="6">Jackson PJ</author>
                    <author ORCID="0000-0001-5331-3551" order="7">Farmer DA</author>
                    <author ORCID="0000-0002-1663-0205" order="8">Johnson MP</author>
                    <author order="9">Siebert CA</author>
                    <author ORCID="0000-0001-6572-434X" order="10">Hitchcock A</author>
                    <author ORCID="0000-0003-2533-9783" order="11">Hunter CN</author>
                    <title>Cryo-EM structure of the four-subunit Rhodobacter sphaeroides cytochrome bc 1 complex in styrene maleic acid nanodiscs.</title>
                    <journal_abbreviation>Proc.Natl.Acad.Sci.USA</journal_abbreviation>
                    <country>US</country>
                    <volume>120</volume>
                    <first_page>e2217922120</first_page>
                    <last_page>e2217922120</last_page>
                    <year>2023</year>
                    <external_references type="PUBMED">36913593</external_references>
                    <external_references type="DOI">doi:10.1073/pnas.2217922120</external_references>
                    <external_references type="ISSN">1091-6490</external_references>
                    <external_references type="CSD">0040</external_references>
                    <external_references type="ASTM">PNASA6</external_references>
                </journal_citation>
            </primary_citation>
        </citation_list>
        <pdb_list>
            <pdb_reference>
                <pdb_id>8asi</pdb_id>
                <relationship>
                    <in_frame>FULLOVERLAP</in_frame>
                </relationship>
            </pdb_reference>
        </pdb_list>
        <other_db_list>
            <db_reference>
                <db_name>EMDB</db_name>
                <accession_id>EMD-15616</accession_id>
                <content_type>associated EM volume</content_type>
                <details>Four subunit cytochrome b-c1 complex from Rhodobacter sphaeroides in native nanodiscs - consensus refinement in the b-b conformation</details>
            </db_reference>
        </other_db_list>
    </crossreferences>
    <sample>
        <name>Four subunit cytochrome b-c1 complex from Rhodobacter sphaeroides</name>
        <supramolecule_list>
            <complex_supramolecule supramolecule_id="1">
                <name>Four subunit cytochrome b-c1 complex from Rhodobacter sphaeroides</name>
                <parent>0</parent>
                <macromolecule_list>
                    <macromolecule>
                        <macromolecule_id>1</macromolecule_id>
                    </macromolecule>
                    <macromolecule>
                        <macromolecule_id>2</macromolecule_id>
                    </macromolecule>
                    <macromolecule>
                        <macromolecule_id>3</macromolecule_id>
                    </macromolecule>
                    <macromolecule>
                        <macromolecule_id>4</macromolecule_id>
                    </macromolecule>
                </macromolecule_list>
                <details>Four subunit cytochrome b-c1 complex from Rhodobacter sphaeroides purified in SMA copolymer lipid nanodiscs</details>
                <natural_source database="NCBI">
                    <organism ncbi="272943">Cereibacter sphaeroides</organism>
                    <strain>2.4.1</strain>
                </natural_source>
            </complex_supramolecule>
        </supramolecule_list>
        <macromolecule_list>
            <protein_or_peptide macromolecule_id="1">
                <name>Ubiquinol-cytochrome c reductase iron-sulfur subunit</name>
                <natural_source database="NCBI">
                    <organism ncbi="272943">Cereibacter sphaeroides 2.4.1</organism>
                    <strain>ATCC 17023 / DSM 158 / JCM 6121 / CCUG 31486 / LMG 2827 / NBRC 12203 / NCIMB 8253 / ATH 2.4.1.</strain>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.019928374999999998</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MSNAEDHAGTRRDFLYYATAGAGAVATGAAVWPLINQMNPSADVQALASIFVDVSSVEPGVQLTVKFLGKPIFIRRRTEA
DIELGRSVQLGQLVDTNARNANIDAGAEATDQNRTLDEAGEWLVMWGVCTHLGCVPIGGVSGDFGGWFCPCHGSHYDSAG
RIRKGPAPENLPIPLAKFIDETTIQLG</string>
                    <external_references type="UNIPROTKB">Q3IY09</external_references>
                </sequence>
                <ec_number>7.1.1.8</ec_number>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="2">
                <name>Cytochrome b</name>
                <natural_source database="NCBI">
                    <organism ncbi="272943">Cereibacter sphaeroides 2.4.1</organism>
                    <strain>ATCC 17023 / DSM 158 / JCM 6121 / CCUG 31486 / LMG 2827 / NBRC 12203 / NCIMB 8253 / ATH 2.4.1.</strain>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.050087422</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MSGIPHDHYEPRTGIEKWLHSRLPIVALAYDTIMIPTPRNLNWMWIWGVVLAFCLVLQIVTGIVLAMHYTPHVDLAFASV
EHIMRNVNGGFMLRYLHANGASLFFIAVYLHIFRGLYYGSYKAPREVTWIVGMLIYLAMMATAFMGYVLPWGQMSFWGAT
VITGLFGAIPGIGHSIQTWLLGGPAVDNATLNRFFSLHYLLPFVIAALVAIHIWAFHSTGNNNPTGVEVRRTSKAEAQKD
TVPFWPYFIIKDVFALAVVLLVFFAIVGFMPNYLGHPDNYIEANPLSTPAHIVPEWYFLPFYAILRAFTADVWVVQIANF
ISFGIIDAKFFGVLAMFGAILVMALVPWLDTSPVRSGRYRPMFKIYFWLLAADFVILTWVGAQQTTFPYDWISLIASAYW
FAYFLVILPILGAIEKPVAPPATIEEDFNAHYSPATGGTKTVVAE</string>
                    <external_references type="UNIPROTKB">Q3IY10</external_references>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="3">
                <name>Cytochrome c1</name>
                <natural_source database="NCBI">
                    <organism ncbi="272943">Cereibacter sphaeroides 2.4.1</organism>
                    <strain>ATCC 17023 / DSM 158 / JCM 6121 / CCUG 31486 / LMG 2827 / NBRC 12203 / NCIMB 8253 / ATH 2.4.1.</strain>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.030661663999999998</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MIRKLTLTAATALALSGGAAMAAGGGHVEDVPFSFEGPFGTFDQHQLQRGLQVYTEVCAACHGMKFVPIRSLSEPGGPEL
PEDQVRAYATQFTVTDEETGEDREGKPTDHFPHSALENAPDLSLMAKARAGFHGPMGTGISQLFNGIGGPEYIYSVLTGF
PEEPPKCAEGHEPDGFYYNRAFQNGSVPDTCKDANGVKTTAGSWIAMPPPLMDDLVEYADGHDASVHAMAEDVSAFLMWA
AEPKLMARKQAGFTAVMFLTVLSVLLYLTNKRLWAGVKGKKKTNV</string>
                    <external_references type="UNIPROTKB">Q3IY11</external_references>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="4">
                <name>Cytochrome b-c1 subunit IV</name>
                <natural_source database="NCBI">
                    <organism ncbi="272943">Cereibacter sphaeroides 2.4.1</organism>
                    <strain>ATCC 17023 / DSM 158 / JCM 6121 / CCUG 31486 / LMG 2827 / NBRC 12203 / NCIMB 8253 / ATH 2.4.1.</strain>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.014415300999999998</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MFSFIDDIPSFEQIKARVRDDLRKHGWEKRWNDSRLVQKSRELLNDEELKIDPATWIWKRMPSREEVAARRQRDFETVWK
YRYRLGGFASGALLALALAGIFSTGNFGGSSDAGNRPSVVYPIE</string>
                    <external_references type="UNIPROTKB">Q3J2Z2</external_references>
                </sequence>
            </protein_or_peptide>
            <ligand macromolecule_id="5">
                <name>FE2/S2 (INORGANIC) CLUSTER</name>
                <molecular_weight>
                    <theoretical units="MDa">0.00017581999999999998</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <formula>FES</formula>
            </ligand>
            <ligand macromolecule_id="6">
                <name>1,2-dioleoyl-sn-glycero-3-phosphoethanolamine</name>
                <molecular_weight>
                    <theoretical units="MDa">0.000744034</theoretical>
                </molecular_weight>
                <number_of_copies>12</number_of_copies>
                <formula>PEE</formula>
            </ligand>
            <ligand macromolecule_id="7">
                <name>PROTOPORPHYRIN IX CONTAINING FE</name>
                <molecular_weight>
                    <theoretical units="MDa">0.000616487</theoretical>
                </molecular_weight>
                <number_of_copies>4</number_of_copies>
                <formula>HEM</formula>
            </ligand>
            <ligand macromolecule_id="8">
                <name>HEME C</name>
                <molecular_weight>
                    <theoretical units="MDa">0.0006185030000000001</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <formula>HEC</formula>
            </ligand>
            <ligand macromolecule_id="9">
                <name>UBIQUINONE-10</name>
                <molecular_weight>
                    <theoretical units="MDa">0.0008633429999999999</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <formula>U10</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">
                    <buffer>
                        <ph>8.0</ph>
                        <component>
                            <concentration units="mM">20.0</concentration>
                            <formula>2-Amino-2-(hydroxymethyl)-1,3-propanediol</formula>
                            <name>Tris</name>
                        </component>
                        <component>
                            <concentration units="mM">200.0</concentration>
                            <formula>NaCl</formula>
                            <name>NaCl</name>
                        </component>
                        <details>Solutions were freshly prepared from concentrated stock solutions.</details>
                    </buffer>
                    <grid>
                        <model>Quantifoil R1.2/1.3</model>
                        <material>COPPER</material>
                        <mesh>300</mesh>
                        <support_film film_type_id="1">
                            <film_material>CARBON</film_material>
                            <film_topology>HOLEY ARRAY</film_topology>
                        </support_film>
                        <pretreatment>
                            <type>GLOW DISCHARGE</type>
                            <time units="s">12</time>
                            <atmosphere>OTHER</atmosphere>
                        </pretreatment>
                    </grid>
                    <vitrification>
                        <cryogen_name>ETHANE</cryogen_name>
                        <chamber_humidity units="percentage">80</chamber_humidity>
                        <chamber_temperature units="K">298</chamber_temperature>
                        <instrument>LEICA EM GP</instrument>
                        <details>15 ul of sample was applied to the grid, incubated for 30 s, blotted for 4 s then plunged in liquid ethane.. </details>
                    </vitrification>
                    <details>Monodisperse particles consisting of four-subunit cyt b-c1 solubilised in styrene maleic acid nanodiscs</details>
                </single_particle_preparation>
            </specimen_preparation_list>
            <microscopy_list>
                <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="µm">50.0</c2_aperture_diameter>
                    <nominal_cs units="mm">2.7</nominal_cs>
                    <nominal_defocus_min units="µm">0.8</nominal_defocus_min>
                    <nominal_defocus_max units="µm">2.0</nominal_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>
                    <alignment_procedure>
                        <coma_free/>
                    </alignment_procedure>
                    <specialist_optics>
                        <energy_filter>
                            <slit_width units="eV">20</slit_width>
                        </energy_filter>
                    </specialist_optics>
                    <image_recording_list>
                        <image_recording image_recording_id="1">
                            <film_or_detector_model>GATAN K3 (6k x 4k)</film_or_detector_model>
                            <digitization_details>
                                <dimensions>
                                    <width units="pixel">5760</width>
                                    <height units="pixel">4092</height>
                                </dimensions>
                            </digitization_details>
                            <number_grids_imaged>1</number_grids_imaged>
                            <number_real_images>15867</number_real_images>
                            <average_exposure_time units="s">1.13</average_exposure_time>
                            <average_electron_dose_per_image units="e/Å^2">1.0</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>
                <details>Images were motion corrected using Motiocorr 2 within RELION using 5 x 5 patches.</details>
                <particle_selection>
                    <number_selected>4060135</number_selected>
                    <details>Particles were picked using crYOLO 1.7.5 using a model trained on this dataset</details>
                </particle_selection>
                <ctf_correction>
                    <software_list>
                        <software>
                            <name>CTFFIND</name>
                            <version>4.1.14</version>
                            <processing_details>Run within RELION 3.1</processing_details>
                        </software>
                    </software_list>
                    <type>PHASE FLIPPING AND AMPLITUDE CORRECTION</type>
                </ctf_correction>
                <startup_model type_of_model="INSILICO MODEL"/>
                <final_reconstruction>
                    <number_classes_used>1</number_classes_used>
                    <applied_symmetry>
                        <point_group>C1</point_group>
                    </applied_symmetry>
                    <algorithm>FOURIER SPACE</algorithm>
                    <resolution units="Å" res_type="BY AUTHOR">2.9</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
                    <software_list>
                        <software>
                            <name>RELION</name>
                            <version>3.1</version>
                        </software>
                    </software_list>
                    <number_images_used>282636</number_images_used>
                </final_reconstruction>
                <initial_angle_assignment>
                    <type>MAXIMUM LIKELIHOOD</type>
                    <software_list>
                        <software>
                            <name>RELION</name>
                            <version>3.1</version>
                        </software>
                    </software_list>
                </initial_angle_assignment>
                <final_angle_assignment>
                    <type>MAXIMUM LIKELIHOOD</type>
                    <software_list>
                        <software>
                            <name>RELION</name>
                            <version>3.1</version>
                        </software>
                    </software_list>
                </final_angle_assignment>
                <final_three_d_classification>
                    <number_classes>10</number_classes>
                    <software_list>
                        <software>
                            <name>RELION</name>
                            <version>3.1</version>
                        </software>
                    </software_list>
                    <details>One high quality class was selected for final refinement</details>
                </final_three_d_classification>
            </singleparticle_processing>
        </structure_determination>
    </structure_determination_list>
    <map format="CCP4" size_kbytes="42593">
        <file>emd_15616.map.gz</file>
        <symmetry>
            <space_group>1</space_group>
        </symmetry>
        <data_type>IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)</data_type>
        <dimensions>
            <col>220</col>
            <row>220</row>
            <sec>220</sec>
        </dimensions>
        <origin>
            <col>0</col>
            <row>0</row>
            <sec>0</sec>
        </origin>
        <spacing>
            <x>220</x>
            <y>220</y>
            <z>220</z>
        </spacing>
        <cell>
            <a units="Å">257.796</a>
            <b units="Å">257.796</b>
            <c units="Å">257.796</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>-0.13314694</minimum>
            <maximum>0.25730422</maximum>
            <average>0.000107765845</average>
            <std>0.005024016</std>
        </statistics>
        <pixel_spacing>
            <x units="Å">1.1717999</x>
            <y units="Å">1.1717999</y>
            <z units="Å">1.1717999</z>
        </pixel_spacing>
        <contour_list>
            <contour primary="true">
                <level>0.018</level>
                <source>AUTHOR</source>
            </contour>
        </contour_list>
        <label>::::EMDATABANK.org::::EMD-15616::::</label>
        <annotation_details>Postprocess refined map from RELION 3.1</annotation_details>
    </map>
    <interpretation>
        <modelling_list>
            <modelling>
                <refinement_space>REAL</refinement_space>
            </modelling>
        </modelling_list>
        <additional_map_list>
            <additional_map format="CCP4" size_kbytes="42593">
                <file>emd_15616_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>220</col>
                    <row>220</row>
                    <sec>220</sec>
                </dimensions>
                <origin>
                    <col>0</col>
                    <row>0</row>
                    <sec>0</sec>
                </origin>
                <spacing>
                    <x>220</x>
                    <y>220</y>
                    <z>220</z>
                </spacing>
                <cell>
                    <a units="Å">257.796</a>
                    <b units="Å">257.796</b>
                    <c units="Å">257.796</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>
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                    <minimum>-0.33781114</minimum>
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                <label>::::EMDATABANK.org::::EMD-15616::::</label>
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                    <row>220</row>
                    <sec>220</sec>
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                <contour_list>
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                <label>::::EMDATABANK.org::::EMD-15616::::</label>
                <annotation_details>Half map 2</annotation_details>
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                    <b units="Å">257.796</b>
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                    <gamma units="deg">90.0</gamma>
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                <contour_list>
                    <contour primary="true">
                        <source>AUTHOR</source>
                    </contour>
                </contour_list>
                <label>::::EMDATABANK.org::::EMD-15616::::</label>
                <annotation_details>Half map 1</annotation_details>
            </half_map>
        </half_map_list>
    </interpretation>
</emd>
