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    <admin>
        <current_status>
            <date>2025-12-17</date>
            <code>REL</code>
            <processing_site>PDBe</processing_site>
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        <sites>
            <deposition>PDBe</deposition>
            <last_processing>PDBe</last_processing>
        </sites>
        <key_dates>
            <deposition>2025-12-01</deposition>
            <header_release>2025-12-17</header_release>
            <map_release>2025-12-17</map_release>
            <update>2025-12-17</update>
        </key_dates>
        <grant_support>
            <grant_reference>
                <funding_body>Foundation for Polish Science</funding_body>
                <code>POIR.04.04.00-00-5B54/17-00</code>
                <country>Poland</country>
            </grant_reference>
            <grant_reference>
                <funding_body>Foundation for Polish Science</funding_body>
                <code>TEAM TECH CORE FACILITY/2017-4/6</code>
                <country>Poland</country>
            </grant_reference>
        </grant_support>
        <title>Cryo-EM structure of Spinacia oleracea cytochrome b6f complex with bound plastocyanin</title>
        <authors_list>
            <author>Pietras R</author>
            <author>Sarewicz M</author>
            <author>Szwalec M</author>
            <author>Indyka P</author>
            <author>Rawski M</author>
            <author>Pintscher S</author>
            <author>Mielecki B</author>
            <author>Jaciuk M</author>
            <author>Koziej L</author>
            <author>Glatt S</author>
            <author>Osyczka A</author>
            <author>Osyczka A</author>
        </authors_list>
        <keywords>b6f complex, photosynthesis, membrane protein, electron transport, proton transport, quinone catalysis, plastocyanin, OXIDOREDUCTASE</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author ORCID="0000-0001-6813-5997" order="1">Sarewicz M</author>
                    <author ORCID="0000-0002-3548-2164" order="2">Szwalec M</author>
                    <author ORCID="0000-0001-6356-2607" order="3">Pintscher S</author>
                    <author ORCID="0000-0002-9684-2127" order="4">Indyka P</author>
                    <author ORCID="0000-0002-8553-7637" order="5">Rawski M</author>
                    <author ORCID="0000-0001-8424-6590" order="6">Pietras R</author>
                    <author ORCID="0000-0002-8597-4888" order="7">Mielecki B</author>
                    <author ORCID="0000-0003-3885-3845" order="8">Koziej L</author>
                    <author ORCID="0000-0003-1251-1492" order="9">Jaciuk M</author>
                    <author ORCID="0000-0003-2815-7133" order="10">Glatt S</author>
                    <author ORCID="0000-0002-1637-2365" order="11">Osyczka A</author>
                    <title>High-resolution cryo-EM structures of plant cytochrome b6f at work</title>
                    <journal_abbreviation>Sci Adv</journal_abbreviation>
                    <country>US</country>
                    <volume>9</volume>
                    <first_page>eadd9688</first_page>
                    <year>2023</year>
                    <external_references type="PUBMED">36638176</external_references>
                    <external_references type="DOI">doi:10.1126/sciadv.add9688</external_references>
                    <external_references type="ISSN">2375-2548</external_references>
                </journal_citation>
            </primary_citation>
        </citation_list>
        <emdb_list>
            <emdb_reference>
                <emdb_id>EMD-14123</emdb_id>
                <relationship>
                    <other>other EM volume</other>
                </relationship>
                <details>Cryo-EM map of catalytically active Spinacia oleracea cytochrome b6f in complex with endogenous plastoquinones</details>
            </emdb_reference>
        </emdb_list>
        <pdb_list>
            <pdb_reference>
                <pdb_id>9tgg</pdb_id>
                <relationship>
                    <in_frame>FULLOVERLAP</in_frame>
                </relationship>
            </pdb_reference>
        </pdb_list>
        <other_db_list>
            <db_reference>
                <db_name>PDB</db_name>
                <accession_id>7QRM</accession_id>
                <content_type>unspecified</content_type>
                <details>Cryo-EM structure of catalytically active Spinacia oleracea cytochrome b6f in complex with endogenous plastoquinones</details>
            </db_reference>
            <db_reference>
                <db_name>EMDB</db_name>
                <accession_id>EMD-14123</accession_id>
                <content_type>other EM volume</content_type>
                <details>Cryo-EM map of catalytically active Spinacia oleracea cytochrome b6f in complex with endogenous plastoquinones</details>
            </db_reference>
            <db_reference>
                <db_name>EMDB</db_name>
                <accession_id>EMD-55898</accession_id>
                <content_type>associated EM volume</content_type>
                <details>Cryo-EM structure of Spinacia oleracea cytochrome b6f complex with bound plastocyanin</details>
            </db_reference>
        </other_db_list>
    </crossreferences>
    <sample>
        <name>cytochrome b6f complex incubated with plastocyanin</name>
        <supramolecule_list>
            <complex_supramolecule supramolecule_id="1">
                <name>cytochrome b6f complex incubated with plastocyanin</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>
                        <macromolecule_id>5</macromolecule_id>
                    </macromolecule>
                    <macromolecule>
                        <macromolecule_id>6</macromolecule_id>
                    </macromolecule>
                    <macromolecule>
                        <macromolecule_id>7</macromolecule_id>
                    </macromolecule>
                    <macromolecule>
                        <macromolecule_id>8</macromolecule_id>
                    </macromolecule>
                </macromolecule_list>
                <natural_source database="NCBI">
                    <organism ncbi="3562">Spinacia oleracea</organism>
                    <organ>leaf</organ>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.23</theoretical>
                </molecular_weight>
            </complex_supramolecule>
        </supramolecule_list>
        <macromolecule_list>
            <protein_or_peptide macromolecule_id="1">
                <name>Cytochrome b6</name>
                <natural_source database="NCBI">
                    <organism ncbi="3562">Spinacia oleracea</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.024186504</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MSKVYDWFEERLEIQAIADDITSKYVPPHVNIFYCLGGITLTCFLVQVATGFAMTFYYRPTVTDAFASVQYIMTEVNFGW
LIRSVHRWSASMMVLMMILHVFRVYLTGGFKKPRELTWVTGVVLGVLTASFGVTGYSLPWDQIGYWAVKIVTGVPDAIPV
IGSPLVELLRGSASVGQSTLTRFYSLHTFVLPLLTAVFMLMHFLMIRKQGISGPL</string>
                    <external_references type="UNIPROTKB">P00165</external_references>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="2">
                <name>Cytochrome b6-f complex subunit 4</name>
                <natural_source database="NCBI">
                    <organism ncbi="3562">Spinacia oleracea</organism>
                    <organ>leaf</organ>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.017456661999999998</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MGVTKKPDLNDPVLRAKLAKGMGHNYYGEPAWPNDLLYIFPVVILGTIACNVGLAVLEPSMIGEPADPFATPLEILPEWY
FFPVFQILRTVPNKLLGVLLMASVPAGLLTVPFLENVNKFQNPFRRPVATTVFLVGTVVALWLGIGATLPIDKSLTLGLF</string>
                    <external_references type="UNIPROTKB">P00166</external_references>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="3">
                <name>Cytochrome f</name>
                <natural_source database="NCBI">
                    <organism ncbi="3562">Spinacia oleracea</organism>
                    <organ>leaf</organ>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.03135702</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>YPIFAQQGYENPREATGRIVCANCHLANKPVDIEVPQAVLPDTVFEAVVRIPYDMQLKQVLANGKKGGLNVGAVLILPEG
FELAPPDRISPEMKEKMGNLSFQSYRPNKQNILVIGPVPGQKYSEITFPILAPDPATKKDVHFLKYPIYVGGNRGRGQIY
PDGSKSNNTVYNSTATGIVKKIVRKEKGGYEINIADASDGREVVDIIPRGPELLVSEGESIKLDQPLTSNPNVGGFGQGD
AEVVLQDPLRIQGLLFFFASVILAQIFLVLKKKQFEKVQLSEMNF</string>
                    <external_references type="UNIPROTKB">P16013</external_references>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="4">
                <name>Cytochrome b6-f complex iron-sulfur subunit, chloroplastic</name>
                <natural_source database="NCBI">
                    <organism ncbi="3562">Spinacia oleracea</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.018956479999999998</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>ATSIPADNVPDMQKRETLNLLLLGALSLPTGYMLLPYASFFVPPGGGAGTGGTIAKDALGNDVIAAEWLKTHAPGDRTLT
QGLKGDPTYLVVESDKTLATFGINAVCTHLGCVVPFNAAENKFICPCHGSQYNNQGRVVRGPAPLSLALAHCDVDDGKVV
FVPWTETDFRTGEAPWWSA</string>
                    <external_references type="UNIPROTKB">P08980</external_references>
                </sequence>
                <ec_number>7.1.1.6</ec_number>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="5">
                <name>Cytochrome b6-f complex subunit 6</name>
                <natural_source database="NCBI">
                    <organism ncbi="3562">Spinacia oleracea</organism>
                    <organ>leaf</organ>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.0034521999999999995</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MFTLTSYFGFLLAALTITSALFIGLNKIRLI</string>
                    <external_references type="UNIPROTKB">Q9M3L0</external_references>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="6">
                <name>Cytochrome b6-f complex subunit 7</name>
                <natural_source database="NCBI">
                    <organism ncbi="3562">Spinacia oleracea</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.003774431</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>NAAAEIFRIAAVMNGLTLVGVAIGFVLLRIEATVEE</string>
                    <external_references type="UNIPROTKB">P80883</external_references>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="7">
                <name>Cytochrome b6-f complex subunit 5</name>
                <natural_source database="NCBI">
                    <organism ncbi="3562">Spinacia oleracea</organism>
                    <organ>leaf</organ>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.004171985</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MIEVFLFGIVLGLIPITLAGLFVTAYLQYRRGDQLDL</string>
                    <external_references type="UNIPROTKB">P69461</external_references>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="8">
                <name>Cytochrome b6-f complex subunit 8</name>
                <natural_source database="NCBI">
                    <organism ncbi="3562">Spinacia oleracea</organism>
                    <organ>leaf</organ>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.003170809</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MDIVSLAWAALMVVFTFSLSLVVWGRSGL</string>
                    <external_references type="UNIPROTKB">P61045</external_references>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="9">
                <name>Plastocyanin, chloroplastic</name>
                <natural_source database="NCBI">
                    <organism ncbi="3562">Spinacia oleracea</organism>
                    <organ>leaf</organ>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.010420557</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>VEVLLGGGDGSLAFLPGDFSVASGEEIVFKNNAGFPHNVVFDEDEIPSGVDAAKISMSEEDLLNAPGETYKVTLTEKGTY
KFYCSPHQGAGMVGKVTVN</string>
                    <external_references type="UNIPROTKB">P00289</external_references>
                </sequence>
            </protein_or_peptide>
            <ligand macromolecule_id="10">
                <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="11">
                <name>HEME C</name>
                <molecular_weight>
                    <theoretical units="MDa">0.0006185030000000001</theoretical>
                </molecular_weight>
                <number_of_copies>4</number_of_copies>
                <formula>HEC</formula>
            </ligand>
            <ligand macromolecule_id="12">
                <name>UNDECYL-MALTOSIDE</name>
                <molecular_weight>
                    <theoretical units="MDa">0.000496589</theoretical>
                </molecular_weight>
                <number_of_copies>6</number_of_copies>
                <formula>UMQ</formula>
            </ligand>
            <ligand macromolecule_id="13">
                <name>2,3-DIMETHYL-5-(3,7,11,15,19,23,27,31,35-NONAMETHYL-2,6,10,14,18,22,26,30,34-HEXATRIACONTANONAENYL-2,5-CYCLOHEXADIENE-1,4-DIONE-2,3-DIMETHYL-5-SOLANESYL-1,4-BENZOQUINONE</name>
                <molecular_weight>
                    <theoretical units="MDa">0.000749201</theoretical>
                </molecular_weight>
                <number_of_copies>7</number_of_copies>
                <formula>PL9</formula>
            </ligand>
            <ligand macromolecule_id="14">
                <name>CHLOROPHYLL A</name>
                <molecular_weight>
                    <theoretical units="MDa">0.000893489</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <formula>CLA</formula>
            </ligand>
            <ligand macromolecule_id="15">
                <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="16">
                <name>1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL</name>
                <molecular_weight>
                    <theoretical units="MDa">0.0007951159999999999</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <formula>SQD</formula>
            </ligand>
            <ligand macromolecule_id="17">
                <name>BETA-CAROTENE</name>
                <molecular_weight>
                    <theoretical units="MDa">0.000536873</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <formula>BCR</formula>
            </ligand>
            <ligand macromolecule_id="18">
                <name>COPPER (II) ION</name>
                <molecular_weight>
                    <theoretical units="MDa">6.354599999999999e-05</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <formula>CU</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">
                    <concentration units="mg/mL">9.5</concentration>
                    <buffer>
                        <ph>7.5</ph>
                        <component>
                            <concentration units="mM">10.0</concentration>
                            <formula>C4H11NO3</formula>
                            <name>TRIS-HCL</name>
                        </component>
                        <component>
                            <concentration units="mM">15.0</concentration>
                            <formula>NaCl</formula>
                            <name>sodium chloride</name>
                        </component>
                        <component>
                            <concentration units="mM">0.7</concentration>
                            <formula>C23H44O11</formula>
                            <name>n-undecyl beta-maltoside</name>
                        </component>
                    </buffer>
                    <grid>
                        <model>Quantifoil R2/1</model>
                        <material>COPPER</material>
                        <mesh>200</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">60</time>
                            <atmosphere>AIR</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>
                    </vitrification>
                    <details>final concentration of cytochrome b6f dimers and plastocyanin was 38.7 uM and 100 uM, respectively</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">0.9</nominal_defocus_min>
                    <nominal_defocus_max units="µm">2.1</nominal_defocus_max>
                    <nominal_magnification>105000.0</nominal_magnification>
                    <specimen_holder_model>FEI TITAN KRIOS AUTOGRID HOLDER</specimen_holder_model>
                    <specialist_optics>
                        <energy_filter>
                            <name>GIF Bioquantum</name>
                            <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 BIOQUANTUM (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>7784</number_real_images>
                            <average_electron_dose_per_image units="e/Å^2">40.0</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>
                <particle_selection>
                    <number_selected>177412</number_selected>
                    <details>template picker</details>
                </particle_selection>
                <ctf_correction>
                    <software_list>
                        <software>
                            <name>cryoSPARC</name>
                            <version>3.3.1</version>
                        </software>
                    </software_list>
                    <type>PHASE FLIPPING AND AMPLITUDE CORRECTION</type>
                </ctf_correction>
                <startup_model type_of_model="OTHER">
                    <details>Ab-initio</details>
                </startup_model>
                <final_reconstruction>
                    <number_classes_used>1</number_classes_used>
                    <algorithm>FOURIER SPACE</algorithm>
                    <resolution units="Å" res_type="BY AUTHOR">3.18</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
                    <software_list>
                        <software>
                            <name>RELION</name>
                            <version>3.1.2</version>
                        </software>
                    </software_list>
                    <number_images_used>87892</number_images_used>
                </final_reconstruction>
                <initial_angle_assignment>
                    <type>MAXIMUM LIKELIHOOD</type>
                    <software_list>
                        <software>
                            <name>cryoSPARC</name>
                            <version>3.3.1</version>
                        </software>
                    </software_list>
                </initial_angle_assignment>
                <final_angle_assignment>
                    <type>NOT APPLICABLE</type>
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</emd>
