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        <key_dates>
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            <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>Swiss National Science Foundation</funding_body>
                <code>TMCG-2+213773</code>
                <country>Switzerland</country>
            </grant_reference>
        </grant_support>
        <title>Cryo-EM structure of the light-driven sodium pump ErNaR in the monomeric form in the O2 state</title>
        <authors_list>
            <author>Haubner M</author>
            <author>Williams HM</author>
            <author>Hruby J</author>
            <author>Straub MS</author>
            <author>Guskov A</author>
            <author>Kovalev K</author>
            <author>Drabbels M</author>
            <author>Lorenz UJ</author>
        </authors_list>
        <keywords>rhodopsin, ErNaR, sodium pump, phototransduction, MEMBRANE PROTEIN</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author ORCID="0000-0002-7320-240X" order="1">Haubner M</author>
                    <author ORCID="0000-0001-9108-9933" order="2">Williams HM</author>
                    <author ORCID="0000-0002-5837-9119" order="3">Hruby J</author>
                    <author ORCID="0000-0002-7721-5048" order="4">Straub MS</author>
                    <author ORCID="0000-0003-2340-2216" order="5">Guskov A</author>
                    <author ORCID="0000-0002-2229-181X" order="6">Kovalev K</author>
                    <author ORCID="0000-0001-8611-2684" order="7">Drabbels M</author>
                    <author ORCID="0000-0002-8869-5999" order="8">Lorenz UJ</author>
                    <title>Microsecond Time-Resolved Cryo-EM Based on Jet Vitrification.</title>
                    <journal_abbreviation>Biorxiv</journal_abbreviation>
                    <country>US</country>
                    <year>2025</year>
                    <external_references type="PUBMED">41332690</external_references>
                    <external_references type="DOI">doi:10.1101/2025.11.21.689681</external_references>
                    <external_references type="ISSN">2692-8205</external_references>
                </journal_citation>
            </primary_citation>
        </citation_list>
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            <emdb_reference>
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                <relationship>
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            <emdb_reference>
                <emdb_id>EMD-55766</emdb_id>
                <relationship>
                    <other>other EM volume</other>
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                <details>same protein, same paper</details>
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        </emdb_list>
        <pdb_list>
            <pdb_reference>
                <pdb_id>9tbf</pdb_id>
                <relationship>
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            <db_reference>
                <db_name>EMDB</db_name>
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                <content_type>other EM volume</content_type>
                <details>same protein, same paper</details>
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            <db_reference>
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                <details>Cryo-EM structure of the light-driven sodium pump ErNaR in the monomeric form in the O2 state</details>
            </db_reference>
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    <sample>
        <name>ErNaR light-driven sodium pump</name>
        <supramolecule_list>
            <organelle_or_cellular_component_supramolecule supramolecule_id="1">
                <name>ErNaR light-driven sodium pump</name>
                <parent>0</parent>
                <macromolecule_list>
                    <macromolecule>
                        <macromolecule_id>1</macromolecule_id>
                    </macromolecule>
                </macromolecule_list>
                <natural_source database="NCBI">
                    <organism ncbi="1041">Erythrobacter</organism>
                </natural_source>
            </organelle_or_cellular_component_supramolecule>
        </supramolecule_list>
        <macromolecule_list>
            <protein_or_peptide macromolecule_id="1">
                <name>Bacteriorhodopsin-like protein</name>
                <natural_source database="NCBI">
                    <organism ncbi="1041">Erythrobacter</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.030676467</theoretical>
                </molecular_weight>
                <details>Bear in mind that LFA and LMT are not part of the sequence here. They derive from the protein solution.</details>
                <number_of_copies>1</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="562">Escherichia coli</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MPSIENFLAYDFWQYDVIRHLFAFSTAVFLAGLVYFAMTARTTAPNYRLSANISAVVMVSAALELGQLWLLWNESFQWAE
LQGSFVPVAGERFSNGYRYMNWLIDVPMLATQLVVVCGFVGTELRNRWAKLTIAGVLMILTGYVGQYFEPAVAGVPGYEG
AEQFWIWGIISTAFFVWMLLILANAVRNPQGAPSDEVRSRLKFCFWFLLATWSIYPFAYAMPLFAPTADGVVVRQVIYTV
ADVSSKLVFGVILSQVALRRSAEEGFEPARVASG</string>
                </sequence>
            </protein_or_peptide>
            <ligand macromolecule_id="2">
                <name>EICOSANE</name>
                <molecular_weight>
                    <theoretical units="MDa">0.000282547</theoretical>
                </molecular_weight>
                <number_of_copies>10</number_of_copies>
                <formula>LFA</formula>
            </ligand>
            <ligand macromolecule_id="3">
                <name>DODECYL-BETA-D-MALTOSIDE</name>
                <molecular_weight>
                    <theoretical units="MDa">0.000510615</theoretical>
                </molecular_weight>
                <number_of_copies>3</number_of_copies>
                <formula>LMT</formula>
            </ligand>
            <ligand macromolecule_id="4">
                <name>RETINAL</name>
                <molecular_weight>
                    <theoretical units="MDa">0.00028443599999999994</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <formula>RET</formula>
            </ligand>
            <ligand macromolecule_id="5">
                <name>water</name>
                <molecular_weight>
                    <theoretical units="MDa">1.8015e-05</theoretical>
                </molecular_weight>
                <number_of_copies>13</number_of_copies>
                <formula>HOH</formula>
            </ligand>
        </macromolecule_list>
    </sample>
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            <method>singleParticle</method>
            <aggregation_state>particle</aggregation_state>
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                <single_particle_preparation preparation_id="1">
                    <concentration units="mg/mL">4.5</concentration>
                    <buffer>
                        <ph>8.0</ph>
                        <component>
                            <concentration units="mM">500.0</concentration>
                            <formula>NaCl</formula>
                            <name>sodium chloride</name>
                        </component>
                        <component>
                            <concentration units="mM">10.0</concentration>
                            <formula>C4H11NO3</formula>
                            <name>Tris-HCl</name>
                        </component>
                        <component>
                            <concentration units="%">0.04</concentration>
                            <formula>C24H46O</formula>
                            <name>n-dodecyl-beta-D-maltoside (DDM)</name>
                        </component>
                        <details>10 mM HEPES pH 7.5, 500 mM NaCl</details>
                    </buffer>
                    <grid>
                        <model>Quantifoil R1.2/1.3</model>
                        <material>GOLD</material>
                        <mesh>200</mesh>
                        <pretreatment>
                            <type>GLOW DISCHARGE</type>
                            <time units="s">90</time>
                            <atmosphere>AIR</atmosphere>
                        </pretreatment>
                        <details>Grid was sputter coated with 40 nm thick layer of silver beforehand using a Quorum Q300T device.</details>
                    </grid>
                    <vitrification>
                        <cryogen_name>ETHANE</cryogen_name>
                        <chamber_humidity units="percentage">95</chamber_humidity>
                        <chamber_temperature units="K">277</chamber_temperature>
                        <instrument>FEI VITROBOT MARK IV</instrument>
                        <details>Vitrification carried out using a modified Vitrobot Mark IV, as outlined in the paper reporting this entry.. </details>
                    </vitrification>
                    <details>This sample was monodisperse.</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>
                    <nominal_cs units="mm">2.7</nominal_cs>
                    <nominal_defocus_min units="µm">0.8</nominal_defocus_min>
                    <nominal_defocus_max units="µm">2.4</nominal_defocus_max>
                    <nominal_magnification>165000.0</nominal_magnification>
                    <specimen_holder_model>FEI TITAN KRIOS AUTOGRID HOLDER</specimen_holder_model>
                    <cooling_holder_cryogen>NITROGEN</cooling_holder_cryogen>
                    <image_recording_list>
                        <image_recording image_recording_id="1">
                            <film_or_detector_model>FEI FALCON IV (4k x 4k)</film_or_detector_model>
                            <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>
                <ctf_correction>
                    <software_list>
                        <software>
                            <name>cryoSPARC</name>
                            <version>4.6.0</version>
                        </software>
                    </software_list>
                    <type>PHASE FLIPPING AND AMPLITUDE CORRECTION</type>
                </ctf_correction>
                <startup_model type_of_model="NONE"/>
                <final_reconstruction>
                    <applied_symmetry>
                        <point_group>C1</point_group>
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                    <resolution units="Å" res_type="BY AUTHOR">3.3</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
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                        <software>
                            <name>cryoSPARC</name>
                            <version>4.6.0</version>
                        </software>
                    </software_list>
                    <details>Reconstruction conducted in C1 following symmetry expansion of particle stack in C5.</details>
                    <number_images_used>67385</number_images_used>
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                <initial_angle_assignment>
                    <type>MAXIMUM LIKELIHOOD</type>
                </initial_angle_assignment>
                <final_angle_assignment>
                    <type>MAXIMUM LIKELIHOOD</type>
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