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        <sites>
            <deposition>PDBj</deposition>
            <last_processing>PDBj</last_processing>
        </sites>
        <key_dates>
            <deposition>2025-04-07</deposition>
            <header_release>2025-06-25</header_release>
            <map_release>2025-06-25</map_release>
            <update>2026-08-12</update>
        </key_dates>
        <grant_support>
            <grant_reference>
                <funding_body>Japan Society for the Promotion of Science (JSPS)</funding_body>
                <code>22KJ1795</code>
                <country>Japan</country>
            </grant_reference>
            <grant_reference>
                <funding_body>Japan Society for the Promotion of Science (JSPS)</funding_body>
                <code>22H02273</code>
                <country>Japan</country>
            </grant_reference>
            <grant_reference>
                <funding_body>Japan Society for the Promotion of Science (JSPS)</funding_body>
                <code>24K08729</code>
                <country>Japan</country>
            </grant_reference>
            <grant_reference>
                <funding_body>Japan Agency for Medical Research and Development (AMED)</funding_body>
                <code>JP23ama121001</code>
                <country>Japan</country>
            </grant_reference>
        </grant_support>
        <title>Cryo-EM structure of Na+-translocating NADH-ubiquinone oxidoreductase from Vibrio cholerae reduced by NADH, in the absence of Na+, down state</title>
        <authors_list>
            <author>Ishikawa-Fukuda M</author>
            <author>Kishikawa J</author>
            <author>Kato T</author>
            <author>Murai M</author>
        </authors_list>
        <keywords>Na+-NQR, Na+ pump, oxidoreductase, MEMBRANE PROTEIN</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author ORCID="0000-0002-8620-1801" order="1">Ishikawa-Fukuda M</author>
                    <author ORCID="0009-0006-1830-8566" order="2">Seki T</author>
                    <author ORCID="0000-0003-3913-7330" order="3">Kishikawa JI</author>
                    <author ORCID="0000-0003-4950-0527" order="4">Takahiro M</author>
                    <author ORCID="0000-0003-2168-3069" order="5">Okazaki KI</author>
                    <author ORCID="0000-0002-8879-6685" order="6">Kato T</author>
                    <author ORCID="0000-0003-0708-3438" order="7">Barquera B</author>
                    <author ORCID="0000-0002-1792-554X" order="8">Miyoshi H</author>
                    <author ORCID="0000-0001-6601-2854" order="9">Murai M</author>
                    <title>The Na + -pumping mechanism driven by redox reactions in the NADH-quinone oxidoreductase from Vibrio cholerae relies on dynamic conformational changes.</title>
                    <journal_abbreviation>Biorxiv</journal_abbreviation>
                    <country>US</country>
                    <year>2025</year>
                    <external_references type="PUBMED">40501732</external_references>
                    <external_references type="DOI">doi:10.1101/2025.06.01.656757</external_references>
                    <external_references type="ISSN">2692-8205</external_references>
                </journal_citation>
            </primary_citation>
        </citation_list>
        <pdb_list>
            <pdb_reference>
                <pdb_id>9ud9</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-64065</accession_id>
                <content_type>associated EM volume</content_type>
                <details>Cryo-EM structure of Na+-translocating NADH-ubiquinone oxidoreductase from Vibrio cholerae reduced by NADH, in the absence of Na+, down state</details>
            </db_reference>
        </other_db_list>
    </crossreferences>
    <sample>
        <name>Na(+)-translocating NADH-quinone reductase</name>
        <supramolecule_list>
            <complex_supramolecule supramolecule_id="1">
                <name>Na(+)-translocating NADH-quinone reductase</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_list>
                <natural_source database="NCBI">
                    <organism ncbi="345073">Vibrio cholerae O395</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.214</theoretical>
                </molecular_weight>
            </complex_supramolecule>
        </supramolecule_list>
        <macromolecule_list>
            <protein_or_peptide macromolecule_id="1">
                <name>Na(+)-translocating NADH-quinone reductase subunit A</name>
                <natural_source database="NCBI">
                    <organism ncbi="345073">Vibrio cholerae O395</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.048680733999999996</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="666">Vibrio cholerae</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MITIKKGLDLPIAGTPSQVISDGKAIKKVALLGEEYVGMRPTMHVRVGDEVKKAQILFEDKKNPGVKFTSPVSGKVVEIN
RGAKRVLQSVVIEVAGDDQVTFDKFEANQLASLNRDAIKTQLVESGLWTAFRTRPFSKVPAIDSTSEAIFVTAMDTNPLA
AEPTVVINEQSEAFVAGLDVLSALTTGKVYVCKKGTSLPRSQQPNVEEHVFDGPHPAGLAGTHMHFLYPVSADHVAWSIN
YQDVIAVGQLFLTGELYTQRVVSLAGPVVNKPRLVRTVMGASLEQLVDSEIMPGEVRIISGSVLSGTKATGPHAYLGRYH
LQVSVLREGRDKELFGWAMPGKNKFSVTRSFLGHLFKGQVYNMTTTTNGSDRSMVPIGNYEKVMPLDMEPTLLLRDLCAG
DSDSAVRLGALELDEEDLALCTFVCPGKYEYGQLLRECLDKIEKEG</string>
                    <external_references type="UNIPROTKB">A5F5X1</external_references>
                </sequence>
                <ec_number>7.2.1.1</ec_number>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="2">
                <name>Na(+)-translocating NADH-quinone reductase subunit B</name>
                <natural_source database="NCBI">
                    <organism ncbi="345073">Vibrio cholerae O395</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.045390883</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="666">Vibrio cholerae</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MGLKKFLEDIEHHFEPGGKHEKWFALYEAAATLFYTPGLVTKRSSHVRDSVDLKRIMIMVWLAVFPAMFWGMYNAGGQAI
AALNHLYSGDQLAAIVAGNWHYWLTEMLGGTMSSDAGWGSKMLLGATYFLPIYATVFIVGGFWEVLFCMVRKHEVNEGFF
VTSILFALIVPPTLPLWQAALGITFGVVVAKEVFGGTGRNFLNPALAGRAFLFFAYPAQISGDLVWTAADGYSGATALSQ
WAQGGAGALINNATGQTITWMDAFIGNIPGSIGEVSTLALMIGAAFIVYMGIASWRIIGGVMIGMILLSTLFNVIGSDTN
AMFNMPWHWHLVLGGFAFGMFFMATDPVSASFTNSGKWAYGILIGVMCVLIRVVNPAYPEGMMLAILFANLFAPLFDHVV
VERNIKRRLARYGKQ</string>
                    <external_references type="UNIPROTKB">A5F5X0</external_references>
                </sequence>
                <ec_number>7.2.1.1</ec_number>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="3">
                <name>Na(+)-translocating NADH-quinone reductase subunit C</name>
                <natural_source database="NCBI">
                    <organism ncbi="345073">Vibrio cholerae O395</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.02765227</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="666">Vibrio cholerae</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MASNNDSIKKTLFVVIALSLVCSIIVSAAAVGLRDKQKENAALDKQSKILQVAGIEAKGSKQIVELFNKSIEPRLVDFNT
GDFVEGDAANYDQRKAAKEASESIKLTAEQDKAKIQRRANVGVVYLVKDGDKTSKVILPVHGNGLWSMMYAFVAVETDGN
TVSGLTYYEQGETPGLGGEVENPAWRAQWVGKKLFDENHKPAIKIVKGGAPQGSEHGVDGLSGATLTSNGVQNTFDFWLG
DMGFGPFLTKVRDGGLN</string>
                    <external_references type="UNIPROTKB">A5F5Y7</external_references>
                </sequence>
                <ec_number>7.2.1.1</ec_number>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="4">
                <name>Na(+)-translocating NADH-quinone reductase subunit D</name>
                <natural_source database="NCBI">
                    <organism ncbi="345073">Vibrio cholerae O395</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.022853217</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="666">Vibrio cholerae</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MSSAKELKKSVLAPVLDNNPIALQVLGVCSALAVTTKLETAFVMTLAVMFVTALSNFFVSLIRNHIPNSVRIIVQMAIIA
SLVIVVDQILKAYLYDISKQLSVFVGLIITNCIVMGRAEAFAMKSEPIPSFIDGIGNGLGYGFVLMTVGFFRELLGSGKL
FGLEVLPLISNGGWYQPNGLMLLAPSAFFLIGFMIWAIRTFKPEQVEAKE</string>
                    <external_references type="UNIPROTKB">A5F5Y6</external_references>
                </sequence>
                <ec_number>7.2.1.1</ec_number>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="5">
                <name>Na(+)-translocating NADH-quinone reductase subunit E</name>
                <natural_source database="NCBI">
                    <organism ncbi="345073">Vibrio cholerae O395</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.021481678</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="666">Vibrio cholerae</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MEHYISLLVKSIFIENMALSFFLGMCTFLAVSKKVKTSFGLGIAVIVVLTISVPVNNLVYNLVLKPDALVEGVDLSFLNF
ITFIGVIAALVQILEMILDRFFPPLYNALGIFLPLITVNCAIFGGVSFMVQRDYSFAESVVYGFGSGVGWMLAIVALAGI
REKMKYSDVPPGLRGLGITFITAGLMALGFMSFSGVQL</string>
                    <external_references type="UNIPROTKB">A5F5Y5</external_references>
                </sequence>
                <ec_number>7.2.1.1</ec_number>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="6">
                <name>Na(+)-translocating NADH-quinone reductase subunit F</name>
                <natural_source database="NCBI">
                    <organism ncbi="345073">Vibrio cholerae O395</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.04594236299999999</theoretical>
                </molecular_weight>
                <details>C-TERMINAL INCLUDES HIS-TAG SEQUENCE AS A PURIFICATION TAG.</details>
                <number_of_copies>1</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="666">Vibrio cholerae</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MSTIIFGVVMFTLIILALVLVILFAKSKLVPTGDITISINGDPEKAIVTQPGGKLLTALAGAGVFVSSACGGGGSCGQCR
VKIKSGGGDILPTELDHISKGEAREGERLACQVAVKADMDLELPEEIFGVKKWECTVISNDNKATFIKELKLAIPDGESV
PFRAGGYIQIEAPAHHVKYADFDVPEKYRGDWDKFNLFRYESKVDEPIIRAYSMANYPEEFGIIMLNVRIATPPPNNPNV
PPGQMSSYIWSLKAGDKCTISGPFGEFFAKDTDAEMVFIGGGAGMAPMRSHIFDQLKRLKSKRKMSYWYGARSKREMFYV
EDFDGLAAENDNFVWHCALSDPQPEDNWTGYTGFIHNVLYENYLKDHEAPEDCEYYMCGPPMMNAAVINMLKNLGVEEEN
ILLDDFGGHHHHHH</string>
                    <external_references type="UNIPROTKB">A5F5Y4</external_references>
                </sequence>
                <ec_number>7.2.1.1</ec_number>
            </protein_or_peptide>
            <ligand macromolecule_id="7">
                <name>FLAVIN MONONUCLEOTIDE</name>
                <molecular_weight>
                    <theoretical units="MDa">0.00045634399999999997</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <formula>FMN</formula>
            </ligand>
            <ligand macromolecule_id="8">
                <name>RIBOFLAVIN</name>
                <molecular_weight>
                    <theoretical units="MDa">0.00037636399999999996</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <formula>RBF</formula>
            </ligand>
            <ligand macromolecule_id="9">
                <name>CALCIUM ION</name>
                <molecular_weight>
                    <theoretical units="MDa">4.0078e-05</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <formula>CA</formula>
            </ligand>
            <ligand macromolecule_id="10">
                <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="11">
                <name>FLAVIN-ADENINE DINUCLEOTIDE</name>
                <molecular_weight>
                    <theoretical units="MDa">0.0007855499999999999</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <formula>FAD</formula>
            </ligand>
            <ligand macromolecule_id="12">
                <name>water</name>
                <molecular_weight>
                    <theoretical units="MDa">1.8015e-05</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <formula>HOH</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">10</concentration>
                    <buffer>
                        <ph>8.0</ph>
                        <component>
                            <concentration units="mM">50.0</concentration>
                            <formula>C4H13Cl2NO3</formula>
                            <name>Tris-HCl</name>
                        </component>
                        <component>
                            <concentration units="mM">1.0</concentration>
                            <formula>C10H16N2O8</formula>
                            <name>Ethylenediaminetetraacetic acid</name>
                        </component>
                        <component>
                            <concentration units="%">0.05</concentration>
                            <formula>C24H46O11</formula>
                            <name>n-DODECYL-beta-D-MALTOSIDE</name>
                        </component>
                        <component>
                            <concentration units="mM">5.0</concentration>
                            <formula>C21H27N7O14P2</formula>
                            <name>NADH</name>
                        </component>
                    </buffer>
                    <grid>
                        <model>Quantifoil R1.2/1.3</model>
                        <material>COPPER</material>
                        <mesh>200</mesh>
                        <pretreatment>
                            <type>GLOW DISCHARGE</type>
                            <time units="s">45</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>
                </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">0.035</nominal_cs>
                    <nominal_defocus_min units="µm">0.8</nominal_defocus_min>
                    <nominal_defocus_max units="µm">1.8</nominal_defocus_max>
                    <nominal_magnification>81000.0</nominal_magnification>
                    <specimen_holder_model>FEI TITAN KRIOS AUTOGRID HOLDER</specimen_holder_model>
                    <cooling_holder_cryogen>NITROGEN</cooling_holder_cryogen>
                    <specialist_optics>
                        <sph_aberration_corrector>Image corrector</sph_aberration_corrector>
                        <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>
                            <number_grids_imaged>1</number_grids_imaged>
                            <average_electron_dose_per_image units="e/Å^2">65.0</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>Non-uniform refinement</details>
                <particle_selection>
                    <number_selected>3653368</number_selected>
                </particle_selection>
                <ctf_correction>
                    <software_list>
                        <software>
                            <name>cryoSPARC</name>
                            <version>v3.3.1</version>
                        </software>
                    </software_list>
                    <type>NONE</type>
                </ctf_correction>
                <startup_model type_of_model="PDB ENTRY">
                    <pdb_model>
                        <pdb_id>7XK3</pdb_id>
                    </pdb_model>
                </startup_model>
                <final_reconstruction>
                    <applied_symmetry>
                        <point_group>C1</point_group>
                    </applied_symmetry>
                    <algorithm>FOURIER SPACE</algorithm>
                    <resolution units="Å" res_type="BY AUTHOR">3.11</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
                    <software_list>
                        <software>
                            <name>cryoSPARC</name>
                            <version>v3.3.1</version>
                        </software>
                    </software_list>
                    <number_images_used>77726</number_images_used>
                </final_reconstruction>
                <initial_angle_assignment>
                    <type>MAXIMUM LIKELIHOOD</type>
                    <software_list>
                        <software>
                            <name>cryoSPARC</name>
                            <version>v3.3.1</version>
                        </software>
                    </software_list>
                </initial_angle_assignment>
                <final_angle_assignment>
                    <type>MAXIMUM LIKELIHOOD</type>
                    <software_list>
                        <software>
                            <name>cryoSPARC</name>
                            <version>v3.3.1</version>
                        </software>
                    </software_list>
                </final_angle_assignment>
                <final_three_d_classification>
                    <number_classes>4</number_classes>
                    <software_list>
                        <software>
                            <name>cryoSPARC</name>
                            <version>v3.3.1</version>
                        </software>
                    </software_list>
                </final_three_d_classification>
            </singleparticle_processing>
        </structure_determination>
    </structure_determination_list>
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        <file>emd_64065.map.gz</file>
        <symmetry>
            <space_group>1</space_group>
        </symmetry>
        <data_type>IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)</data_type>
        <dimensions>
            <col>320</col>
            <row>320</row>
            <sec>320</sec>
        </dimensions>
        <origin>
            <col>0</col>
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        <spacing>
            <x>320</x>
            <y>320</y>
            <z>320</z>
        </spacing>
        <cell>
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