<?xml version="1.0" encoding="UTF-8"?>
<emd xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="https://github.com/emdb-empiar/emdb-schemas/blob/master/v3/v3_0_1_9/emdb.xsd" emdb_id="EMD-4878" version="3.0.1.9">
    <admin>
        <current_status>
            <date>2020-07-29</date>
            <code>REL</code>
            <processing_site>PDBe</processing_site>
        </current_status>
        <sites>
            <deposition>PDBe</deposition>
            <last_processing>PDBe</last_processing>
        </sites>
        <key_dates>
            <deposition>2019-04-17</deposition>
            <header_release>2019-06-12</header_release>
            <map_release>2019-06-12</map_release>
            <update>2020-07-29</update>
        </key_dates>
        <grant_support>
            <grant_reference>
                <funding_body>European Research Council</funding_body>
                <code>759517</code>
                <country>Netherlands</country>
            </grant_reference>
        </grant_support>
        <title>In situ structure of a hexameric IgM complex bound to complement components C1 and two molecules of C4b</title>
        <authors_list>
            <author>Sharp TH</author>
        </authors_list>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author order="1">Sharp TH</author>
                    <author order="2">Boyle AL</author>
                    <author order="3">Diebolder CA</author>
                    <author order="4">Kros A</author>
                    <author order="5">Koster AJ</author>
                    <author order="6">Gros P</author>
                    <title>Insights into IgM-mediated complement activation based on in situ structures of IgM-C1-C4b.</title>
                    <journal_abbreviation>Proc.Natl.Acad.Sci.USA</journal_abbreviation>
                    <country>US</country>
                    <volume>116</volume>
                    <first_page>11900</first_page>
                    <last_page>11905</last_page>
                    <year>2019</year>
                    <external_references type="PUBMED">31147461</external_references>
                    <external_references type="DOI">doi:10.1073/pnas.1901841116</external_references>
                    <external_references type="ISSN">1091-6490</external_references>
                    <external_references type="CSD">0040</external_references>
                    <external_references type="ASTM">PNASA6</external_references>
                </journal_citation>
            </primary_citation>
        </citation_list>
        <emdb_list>
            <emdb_reference>
                <emdb_id>EMD-4878</emdb_id>
                <relationship>
                    <other>associated EM volume</other>
                </relationship>
            </emdb_reference>
        </emdb_list>
    </crossreferences>
    <sample>
        <name>hexameric IgM-C1-C4b2</name>
        <supramolecule_list>
            <complex_supramolecule supramolecule_id="1">
                <name>hexameric IgM-C1-C4b2</name>
                <parent>0</parent>
                <details>Map contains a complex of hexameric IgM, complement component C1 and two molecules of complement component C4b</details>
                <natural_source database="NCBI">
                    <organism ncbi="9606">Homo sapiens</organism>
                    <organ>Human serum</organ>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">2.116</theoretical>
                </molecular_weight>
            </complex_supramolecule>
        </supramolecule_list>
    </sample>
    <structure_determination_list>
        <structure_determination structure_determination_id="1">
            <method>subtomogramAveraging</method>
            <aggregation_state>particle</aggregation_state>
            <specimen_preparation_list>
                <subtomogram_averaging_preparation preparation_id="1">
                    <buffer>
                        <ph>7.4</ph>
                        <component>
                            <formula>PBS</formula>
                            <name>PBS</name>
                        </component>
                    </buffer>
                    <grid>
                        <material>COPPER</material>
                        <support_film film_type_id="1">
                            <film_material>CARBON</film_material>
                            <film_topology>LACEY</film_topology>
                        </support_film>
                        <pretreatment>
                            <type>GLOW DISCHARGE</type>
                        </pretreatment>
                    </grid>
                    <vitrification>
                        <cryogen_name>ETHANE</cryogen_name>
                        <chamber_temperature units="K">277.15</chamber_temperature>
                        <instrument>LEICA EM GP</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>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">0.5</nominal_defocus_min>
                    <nominal_defocus_max units="µm">0.5</nominal_defocus_max>
                    <nominal_magnification>33000.0</nominal_magnification>
                    <specimen_holder_model>FEI TITAN KRIOS AUTOGRID HOLDER</specimen_holder_model>
                    <cooling_holder_cryogen>NITROGEN</cooling_holder_cryogen>
                    <specialist_optics>
                        <phase_plate>VOLTA PHASE PLATE</phase_plate>
                        <energy_filter>
                            <name>GIF Quantum LS</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 K2 SUMMIT (4k x 4k)</film_or_detector_model>
                            <detector_mode>COUNTING</detector_mode>
                            <digitization_details/>
                            <average_exposure_time units="s">2.4</average_exposure_time>
                            <average_electron_dose_per_image units="e/Å^2">1.48</average_electron_dose_per_image>
                            <details>Exposures of 2.4 sec were dose-fractionated into 6 movie frames per tilt angle. The total dose for each tilt series was 80 e-/A^2. Focusing to -300 nm was performed before each image acquisition using a low-dose routine</details>
                        </image_recording>
                    </image_recording_list>
                </subtomogram_averaging_microscopy>
            </microscopy_list>
            <subtomogram_averaging_processing image_processing_id="1">
                <image_recording_id>1</image_recording_id>
                <details>Raw frames were aligned using alignframes and tomograms were reconstructed using weighted back-projection from the software program IMOD.</details>
                <final_reconstruction>
                    <number_classes_used>1</number_classes_used>
                    <applied_symmetry>
                        <point_group>C1</point_group>
                    </applied_symmetry>
                    <resolution units="Å" res_type="BY AUTHOR">26.7</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
                    <software_list>
                        <software>
                            <name>Dynamo</name>
                        </software>
                    </software_list>
                    <number_subtomograms_used>259</number_subtomograms_used>
                </final_reconstruction>
                <extraction>
                    <number_tomograms>54</number_tomograms>
                    <number_images_used>1522</number_images_used>
                    <software_list>
                        <software>
                            <name>EMAN2</name>
                            <version>2.2</version>
                        </software>
                    </software_list>
                </extraction>
                <final_three_d_classification>
                    <number_classes>3</number_classes>
                    <software_list>
                        <software>
                            <name>Dynamo</name>
                        </software>
                    </software_list>
                </final_three_d_classification>
                <final_angle_assignment>
                    <type>NOT APPLICABLE</type>
                    <software_list>
                        <software>
                            <name>Dynamo</name>
                        </software>
                    </software_list>
                </final_angle_assignment>
            </subtomogram_averaging_processing>
        </structure_determination>
    </structure_determination_list>
    <map format="CCP4" size_kbytes="16385">
        <file>emd_4878.map.gz</file>
        <symmetry>
            <space_group>1</space_group>
        </symmetry>
        <data_type>IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)</data_type>
        <dimensions>
            <col>160</col>
            <row>160</row>
            <sec>160</sec>
        </dimensions>
        <origin>
            <col>0</col>
            <row>0</row>
            <sec>-1</sec>
        </origin>
        <spacing>
            <x>160</x>
            <y>160</y>
            <z>160</z>
        </spacing>
        <cell>
            <a units="Å">688.0</a>
            <b units="Å">688.0</b>
            <c units="Å">688.0</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>-1.5185909</minimum>
            <maximum>2.9356854</maximum>
            <average>0.016613847</average>
            <std>0.15100342</std>
        </statistics>
        <pixel_spacing>
            <x units="Å">4.3</x>
            <y units="Å">4.3</y>
            <z units="Å">4.3</z>
        </pixel_spacing>
        <contour_list>
            <contour primary="true">
                <level>0.5</level>
                <source>AUTHOR</source>
            </contour>
        </contour_list>
        <label>::::EMDATABANK.org::::EMD-4878::::</label>
    </map>
    <interpretation>
        <modelling_list>
            <modelling>
                <initial_model>
                    <access_code>1DEE</access_code>
                </initial_model>
                <initial_model>
                    <access_code>4JVU</access_code>
                </initial_model>
                <initial_model>
                    <access_code>4BA8</access_code>
                </initial_model>
                <initial_model>
                    <access_code>4JVW</access_code>
                </initial_model>
                <initial_model>
                    <access_code>1PK6</access_code>
                </initial_model>
                <initial_model>
                    <access_code>6F1C</access_code>
                </initial_model>
                <initial_model>
                    <access_code>1GPZ</access_code>
                </initial_model>
                <initial_model>
                    <access_code>4J1Y</access_code>
                </initial_model>
                <initial_model>
                    <access_code>5JTW</access_code>
                </initial_model>
                <refinement_protocol>RIGID BODY FIT</refinement_protocol>
                <refinement_space>REAL</refinement_space>
            </modelling>
        </modelling_list>
    </interpretation>
</emd>
