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            <date>2020-02-12</date>
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            <deposition>PDBe</deposition>
            <last_processing>PDBe</last_processing>
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        <key_dates>
            <deposition>2019-10-31</deposition>
            <header_release>2019-12-11</header_release>
            <map_release>2019-12-11</map_release>
            <update>2020-02-12</update>
        </key_dates>
        <grant_support>
            <grant_reference>
                <funding_body>Seneca Foundation</funding_body>
                <country>Spain</country>
            </grant_reference>
        </grant_support>
        <title>Putative in situ ER membrane bound major histocompatibility peptide loading complex (PLC)</title>
        <authors_list>
            <author>Martinez-Sanchez A</author>
            <author>Lucic V</author>
            <author>Chakraborty S</author>
        </authors_list>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author order="1">Martinez-Sanchez A</author>
                    <author order="2">Kochovski Z</author>
                    <author order="3">Laugks U</author>
                    <author order="4">Meyer Zum Alten Borgloh J</author>
                    <author order="5">Chakraborty S</author>
                    <author order="6">Pfeffer S</author>
                    <author order="7">Baumeister W</author>
                    <author order="8">Lucic V</author>
                    <title>Template-free detection and classification of membrane-bound complexes in cryo-electron tomograms.</title>
                    <journal_abbreviation>Nat.Methods</journal_abbreviation>
                    <country>US</country>
                    <volume>17</volume>
                    <first_page>209</first_page>
                    <last_page>216</last_page>
                    <year>2020</year>
                    <external_references type="PUBMED">31907446</external_references>
                    <external_references type="DOI">doi:10.1038/s41592-019-0675-5</external_references>
                    <external_references type="ISSN">1548-7105</external_references>
                </journal_citation>
            </primary_citation>
        </citation_list>
        <emdb_list>
            <emdb_reference>
                <emdb_id>EMD-10435</emdb_id>
                <relationship>
                    <other>other EM volume</other>
                </relationship>
                <details>Same sample and putatively a similar complex</details>
            </emdb_reference>
            <emdb_reference>
                <emdb_id>EMD-10436</emdb_id>
                <relationship>
                    <other>associated EM volume</other>
                </relationship>
            </emdb_reference>
        </emdb_list>
    </crossreferences>
    <sample>
        <name>Intact P19 cells</name>
        <supramolecule_list>
            <cell_supramolecule supramolecule_id="1">
                <name>Intact P19 cells</name>
                <parent>0</parent>
                <natural_source database="NCBI">
                    <organism ncbi="10090">Mus musculus</organism>
                    <tissue>teratocarcinoma</tissue>
                </natural_source>
            </cell_supramolecule>
        </supramolecule_list>
    </sample>
    <structure_determination_list>
        <structure_determination structure_determination_id="1">
            <method>subtomogramAveraging</method>
            <aggregation_state>cell</aggregation_state>
            <specimen_preparation_list>
                <subtomogram_averaging_preparation preparation_id="1">
                    <buffer>
                        <ph>7.4</ph>
                    </buffer>
                    <vitrification>
                        <cryogen_name>ETHANE-PROPANE</cryogen_name>
                        <chamber_humidity units="percentage">90</chamber_humidity>
                        <chamber_temperature units="K">310.15</chamber_temperature>
                        <instrument>FEI VITROBOT MARK IV</instrument>
                        <details></details>
                    </vitrification>
                </subtomogram_averaging_preparation>
            </specimen_preparation_list>
            <microscopy_list>
                <subtomogram_averaging_microscopy microscopy_id="1">
                    <microscope>FEI TITAN KRIOS</microscope>
                    <illumination_mode>OTHER</illumination_mode>
                    <imaging_mode>OTHER</imaging_mode>
                    <electron_source>FIELD EMISSION GUN</electron_source>
                    <acceleration_voltage units="kV">300</acceleration_voltage>
                    <c2_aperture_diameter units="µm">70.0</c2_aperture_diameter>
                    <nominal_cs units="mm">2.7</nominal_cs>
                    <nominal_defocus_min units="µm">0.2</nominal_defocus_min>
                    <nominal_defocus_max units="µm">0.25</nominal_defocus_max>
                    <nominal_magnification>42000.0</nominal_magnification>
                    <cooling_holder_cryogen>NITROGEN</cooling_holder_cryogen>
                    <alignment_procedure>
                        <basic/>
                    </alignment_procedure>
                    <specialist_optics>
                        <phase_plate>VOLTA PHASE PLATE</phase_plate>
                        <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 K2 SUMMIT (4k x 4k)</film_or_detector_model>
                            <detector_mode>COUNTING</detector_mode>
                            <average_electron_dose_per_image units="e/Å^2">1.0</average_electron_dose_per_image>
                        </image_recording>
                    </image_recording_list>
                </subtomogram_averaging_microscopy>
            </microscopy_list>
            <subtomogram_averaging_processing image_processing_id="1">
                <image_recording_id>1</image_recording_id>
                <final_reconstruction>
                    <applied_symmetry>
                        <point_group>C1</point_group>
                    </applied_symmetry>
                    <resolution units="Å" res_type="BY AUTHOR">32.18</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
                    <software_list>
                        <software>
                            <name>RELION</name>
                            <version>2.1</version>
                        </software>
                    </software_list>
                    <number_subtomograms_used>177</number_subtomograms_used>
                </final_reconstruction>
                <extraction>
                    <number_tomograms>12</number_tomograms>
                    <number_images_used>172000</number_images_used>
                    <method>Template-free</method>
                    <software_list>
                        <software>
                            <name>IMOD</name>
                            <processing_details>PySeg for particle picking and IMOD for subvolume reconstruction</processing_details>
                        </software>
                    </software_list>
                    <details>PySeg software, automated and comprehensive detection of heterogeneous membrane-bound complexes.</details>
                </extraction>
                <final_three_d_classification>
                    <software_list>
                        <software>
                            <name>RELION</name>
                            <version>2.1</version>
                            <processing_details>Before final classification with RELION, PySeg unsuprevised classification was used.</processing_details>
                        </software>
                    </software_list>
                </final_three_d_classification>
                <final_angle_assignment>
                    <type>MAXIMUM LIKELIHOOD</type>
                    <software_list>
                        <software>
                            <name>RELION</name>
                            <version>2.1</version>
                        </software>
                    </software_list>
                </final_angle_assignment>
            </subtomogram_averaging_processing>
        </structure_determination>
    </structure_determination_list>
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