<?xml version="1.0" encoding="UTF-8"?>
<emd xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="https://ftp.ebi.ac.uk/pub/databases/em_ebi/emdb_related/emdb-schemas/emdb_schemas/v3/v3_0_9_3/emdb.xsd" version="3.0.9.3" emdb_id="EMD-13942">
    <admin>
        <current_status>
            <date>2024-10-09</date>
            <code>REL</code>
            <processing_site>PDBe</processing_site>
        </current_status>
        <sites>
            <deposition>PDBe</deposition>
            <last_processing>PDBe</last_processing>
        </sites>
        <key_dates>
            <deposition>2021-12-03</deposition>
            <header_release>2022-06-15</header_release>
            <map_release>2022-06-15</map_release>
            <update>2024-10-09</update>
        </key_dates>
        <grant_support>
            <grant_reference>
                <funding_body>Medical Research Council (MRC, United Kingdom)</funding_body>
                <code>MR/P010393/1</code>
                <country>United Kingdom</country>
            </grant_reference>
            <grant_reference>
                <funding_body>Leverhulme Trust</funding_body>
                <code>RPG-2015-090</code>
                <country>United Kingdom</country>
            </grant_reference>
        </grant_support>
        <title>human Connexin 26 at 55mm Hg PCO2, pH7.4:two masked subunits, class D</title>
        <authors_list>
            <author>Brotherton DH</author>
            <author>Cameron AD</author>
            <author>Savva CG</author>
            <author>Ragan TJ</author>
        </authors_list>
        <keywords>Gap junction, Ion Channel, carbon dioxide sensitive, MEMBRANE PROTEIN</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author order="1">Brotherton DH</author>
                    <author order="2">Savva CG</author>
                    <author order="3">Ragan TJ</author>
                    <author order="4">Dale N</author>
                    <author order="5">Cameron AD</author>
                    <title>Conformational changes and CO 2 -induced channel gating in connexin26.</title>
                    <journal_abbreviation>Structure</journal_abbreviation>
                    <country>UK</country>
                    <volume>30</volume>
                    <first_page>697</first_page>
                    <last_page>706.e4</last_page>
                    <year>2022</year>
                    <external_references type="PUBMED">35276081</external_references>
                    <external_references type="DOI">doi:10.1016/j.str.2022.02.010</external_references>
                    <external_references type="ISSN">0969-2126</external_references>
                    <external_references type="CSD">2005</external_references>
                    <external_references type="ASTM">STRUE6</external_references>
                </journal_citation>
            </primary_citation>
        </citation_list>
        <pdb_list>
            <pdb_reference>
                <pdb_id>7qev</pdb_id>
                <relationship>
                    <in_frame>FULLOVERLAP</in_frame>
                </relationship>
            </pdb_reference>
        </pdb_list>
    </crossreferences>
    <sample>
        <name>two subunits masked from a dodecameric assembly of human connexin 26: class D</name>
        <supramolecule_list>
            <organelle_or_cellular_component_supramolecule supramolecule_id="1">
                <name>two subunits masked from a dodecameric assembly of human connexin 26: class D</name>
                <parent>0</parent>
                <macromolecule_list>
                    <macromolecule>
                        <macromolecule_id>1</macromolecule_id>
                    </macromolecule>
                </macromolecule_list>
                <natural_source database="NCBI">
                    <organism ncbi="9606">Homo sapiens</organism>
                </natural_source>
            </organelle_or_cellular_component_supramolecule>
        </supramolecule_list>
        <macromolecule_list>
            <protein_or_peptide macromolecule_id="1">
                <name>Gap junction beta-2 protein</name>
                <natural_source database="NCBI">
                    <organism ncbi="9606">Homo sapiens</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.026713673999999996</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="7108">Spodoptera frugiperda</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MDWGTLQTILGGVNKHSTSIGKIWLTVLFIFRIMILVVAAKEVWGDEQADFVCNTLQPGCKNVCYDHYFPISHIRLWALQ
LIFVSTPALLVAMHVAYRRHEKKRKFIKGEIKSEFKDIEEIKTQKVRIEGSLWWTYTSSIFFRVIFEAAFMYVFYVMYDG
FSMQRLVKCNAWPCPNTVDCFVSRPTEKTVFTVFMIAVSGICILLNVTELCYLLIRYCSGKSKKPVLVPR</string>
                    <external_references type="UNIPROTKB">P29033</external_references>
                </sequence>
            </protein_or_peptide>
            <ligand macromolecule_id="2">
                <name>DODECYL-BETA-D-MALTOSIDE</name>
                <molecular_weight>
                    <theoretical units="MDa">0.000510615</theoretical>
                </molecular_weight>
                <number_of_copies>6</number_of_copies>
                <formula>LMT</formula>
            </ligand>
            <ligand macromolecule_id="3">
                <name>PHOSPHATIDYLETHANOLAMINE</name>
                <molecular_weight>
                    <theoretical units="MDa">0.0007340389999999999</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <formula>PTY</formula>
            </ligand>
            <ligand macromolecule_id="4">
                <name>water</name>
                <molecular_weight>
                    <theoretical units="MDa">1.8015e-05</theoretical>
                </molecular_weight>
                <number_of_copies>8</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">3.5</concentration>
                    <buffer>
                        <ph>7.4</ph>
                        <component>
                            <concentration units="mM">100.0</concentration>
                            <formula>NaCl</formula>
                            <name>sodium chloride</name>
                        </component>
                        <component>
                            <concentration units="%">5.0</concentration>
                            <formula>C3H8O3</formula>
                            <name>glycerol</name>
                        </component>
                        <component>
                            <concentration units="mM">1.0</concentration>
                            <formula>C4H10O2S2</formula>
                            <name>DTT</name>
                        </component>
                        <component>
                            <concentration units="%">0.03</concentration>
                            <formula>C24H46O11</formula>
                            <name>DDM</name>
                        </component>
                        <component>
                            <concentration units="mM">50.0</concentration>
                            <formula>NaHCO3</formula>
                            <name>sodium hydrogen carbonate</name>
                        </component>
                        <component>
                            <concentration units="mM">1.25</concentration>
                            <formula>NaH2PO4</formula>
                            <name>sodium dihydrogen phosphate</name>
                        </component>
                        <component>
                            <concentration units="mM">3.0</concentration>
                            <formula>KCl</formula>
                            <name>potassium chloride</name>
                        </component>
                        <component>
                            <concentration units="mM">1.0</concentration>
                            <formula>MgSO4</formula>
                            <name>magnesium sulphate</name>
                        </component>
                        <component>
                            <concentration units="mM">2.0</concentration>
                            <formula>MgCl2</formula>
                            <name>magnesium chloride</name>
                        </component>
                        <details>The buffer, except DDM and DTT, was prepared fresh from 10x stock on day of use. The basal buffer was filtered and de-gassed, and DDM and DTT added. The buffer was pH corrected at point of use to 7.4 using 10% CO2 in 90% N2.</details>
                    </buffer>
                    <grid>
                        <model>UltrAuFoil R1.2/1.3</model>
                        <support_film film_type_id="1">
                            <film_material>GOLD</film_material>
                            <film_topology>HOLEY</film_topology>
                            <film_thickness>50.0</film_thickness>
                        </support_film>
                    </grid>
                    <vitrification>
                        <cryogen_name>ETHANE-PROPANE</cryogen_name>
                        <chamber_humidity units="percentage">95</chamber_humidity>
                        <chamber_temperature units="K">277</chamber_temperature>
                        <instrument>LEICA EM GP</instrument>
                        <details>3 microlitres protein applied to grid, blot time 6 seconds, in 10% CO2/90%N2 atmosphere. </details>
                    </vitrification>
                    <details>This sample monodisperse</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">1.0</nominal_defocus_min>
                    <nominal_defocus_max units="µm">2.0</nominal_defocus_max>
                    <nominal_magnification>81000.0</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 (6k x 4k)</film_or_detector_model>
                            <number_grids_imaged>1</number_grids_imaged>
                            <number_real_images>4003</number_real_images>
                            <average_exposure_time units="s">5.0</average_exposure_time>
                            <average_electron_dose_per_image units="e/Å^2">45.0</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>1679668</number_selected>
                    <details>LoG picker implemented in Relion3.1-beta</details>
                </particle_selection>
                <startup_model type_of_model="INSILICO MODEL"/>
                <final_reconstruction>
                    <resolution units="Å" res_type="BY AUTHOR">2.9</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
                    <number_images_used>18750</number_images_used>
                </final_reconstruction>
                <initial_angle_assignment>
                    <type>PROJECTION MATCHING</type>
                    <projection_matching_processing/>
                </initial_angle_assignment>
                <final_angle_assignment>
                    <type>PROJECTION MATCHING</type>
                    <projection_matching_processing/>
                </final_angle_assignment>
                <final_three_d_classification>
                    <number_classes>4</number_classes>
                </final_three_d_classification>
            </singleparticle_processing>
        </structure_determination>
    </structure_determination_list>
    <map format="CCP4" size_kbytes="24919">
        <file>emd_13942.map.gz</file>
        <symmetry>
            <space_group>1</space_group>
        </symmetry>
        <data_type>IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)</data_type>
        <dimensions>
            <col>184</col>
            <row>184</row>
            <sec>184</sec>
        </dimensions>
        <origin>
            <col>0</col>
            <row>0</row>
            <sec>0</sec>
        </origin>
        <spacing>
            <x>184</x>
            <y>184</y>
            <z>184</z>
        </spacing>
        <cell>
            <a units="Å">200.56001</a>
            <b units="Å">200.56001</b>
            <c units="Å">200.56001</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>-0.021579463</minimum>
            <maximum>0.07353891</maximum>
            <average>0.00017143466</average>
            <std>0.0018826158</std>
        </statistics>
        <pixel_spacing>
            <x units="Å">1.09</x>
            <y units="Å">1.09</y>
            <z units="Å">1.09</z>
        </pixel_spacing>
        <contour_list>
            <contour primary="true">
                <level>0.01</level>
                <source>AUTHOR</source>
            </contour>
        </contour_list>
        <label>::::EMDATABANK.org::::EMD-13942::::</label>
        <annotation_details>fourth dimer from human connexin26 in 55mmHg CO2, pH7.4</annotation_details>
    </map>
    <interpretation>
        <modelling_list>
            <modelling>
                <initial_model>
                    <access_code>2ZW3</access_code>
                    <chain>
                        <source_name>PDB</source_name>
                        <initial_model_type>experimental model</initial_model_type>
                    </chain>
                </initial_model>
                <refinement_space>REAL</refinement_space>
            </modelling>
        </modelling_list>
    </interpretation>
</emd>
