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        <key_dates>
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            <header_release>2021-02-03</header_release>
            <map_release>2021-02-03</map_release>
            <update>2026-08-12</update>
        </key_dates>
        <title>Cryo-EM structure of Apo-bacterioferritin from Streptomyces coelicolor</title>
        <authors_list>
            <author>Jobichen C</author>
            <author>Sivaraman J</author>
        </authors_list>
        <keywords>Ferritin, Nanocage, Bacterioferritin, METAL TRANSPORT</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="false">
                    <author order="1">Jobichen C</author>
                    <author order="2">Sivaraman J</author>
                    <title>Cryo-EM structure of Apo-bacterioferritin from Streptomyces coelicolor.</title>
                    <journal_abbreviation>To Be Published</journal_abbreviation>
                    <external_references type="CSD">0353</external_references>
                </journal_citation>
            </primary_citation>
        </citation_list>
        <pdb_list>
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                <pdb_id>6k3o</pdb_id>
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                <db_name>EMDB</db_name>
                <accession_id>EMD-9910</accession_id>
                <content_type>associated EM volume</content_type>
                <details>Cryo-EM structure of Apo-bacterioferritin from Streptomyces coelicolor</details>
            </db_reference>
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    <sample>
        <name>Bacterioferritin in complex with HEME and IRON</name>
        <supramolecule_list>
            <organelle_or_cellular_component_supramolecule supramolecule_id="1">
                <name>Bacterioferritin in complex with HEME and IRON</name>
                <parent>0</parent>
                <macromolecule_list>
                    <macromolecule>
                        <macromolecule_id>1</macromolecule_id>
                    </macromolecule>
                </macromolecule_list>
                <natural_source database="NCBI">
                    <organism ncbi="1902">Streptomyces coelicolor</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.5</theoretical>
                </molecular_weight>
            </organelle_or_cellular_component_supramolecule>
        </supramolecule_list>
        <macromolecule_list>
            <protein_or_peptide macromolecule_id="1">
                <name>Bacterioferritin</name>
                <natural_source database="NCBI">
                    <organism ncbi="1902">Streptomyces coelicolor</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.019242629</theoretical>
                </molecular_weight>
                <number_of_copies>24</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="866768">Escherichia coli 'BL21-Gold(DE3)pLysS AG'</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MQGDPEVIEFLNEQLTAELTAINQYFLHAKLQDHKGWTKLAKYTRAESFDEMRHAEVLTDRILLLDGLPNYQRLFHVRVG
QSVTEMFQADREVELEAIDRLRRGIEVMRAKHDITSANVFEAILADEEHHIDYLETQLDLIEKLGESLYLSTVIEQTQPD
PSGPGSL</string>
                    <external_references type="UNIPROTKB">Q9S2N0</external_references>
                </sequence>
                <ec_number>1.16.3.1</ec_number>
            </protein_or_peptide>
            <ligand macromolecule_id="2">
                <name>FE (II) ION</name>
                <molecular_weight>
                    <theoretical units="MDa">5.5845e-05</theoretical>
                </molecular_weight>
                <number_of_copies>24</number_of_copies>
                <formula>FE2</formula>
            </ligand>
            <ligand macromolecule_id="3">
                <name>PROTOPORPHYRIN IX CONTAINING FE</name>
                <molecular_weight>
                    <theoretical units="MDa">0.000616487</theoretical>
                </molecular_weight>
                <number_of_copies>12</number_of_copies>
                <formula>HEM</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">1.8</concentration>
                    <buffer>
                        <ph>7.0</ph>
                    </buffer>
                    <grid>
                        <model>Quantifoil, UltrAuFoil, R1.2/1.3</model>
                        <material>GOLD</material>
                        <pretreatment>
                            <type>GLOW DISCHARGE</type>
                        </pretreatment>
                    </grid>
                    <vitrification>
                        <cryogen_name>ETHANE</cryogen_name>
                    </vitrification>
                    <details>This sample was monodisperse with 24mer nanocage assemblies.</details>
                </single_particle_preparation>
            </specimen_preparation_list>
            <microscopy_list>
                <single_particle_microscopy microscopy_id="1">
                    <microscope>FEI TITAN KRIOS</microscope>
                    <illumination_mode>OTHER</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">2.7</c2_aperture_diameter>
                    <image_recording_list>
                        <image_recording image_recording_id="1">
                            <film_or_detector_model>FEI FALCON II (4k x 4k)</film_or_detector_model>
                            <average_electron_dose_per_image units="e/Å^2">1.6</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>cisTEM</name>
                        </software>
                    </software_list>
                    <type>PHASE FLIPPING AND AMPLITUDE CORRECTION</type>
                </ctf_correction>
                <startup_model type_of_model="PDB ENTRY">
                    <pdb_model>
                        <pdb_id>5XX9</pdb_id>
                    </pdb_model>
                </startup_model>
                <final_reconstruction>
                    <applied_symmetry>
                        <point_group>O</point_group>
                    </applied_symmetry>
                    <resolution units="Å" res_type="BY AUTHOR">3.4</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
                    <software_list>
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                            <name>cisTEM</name>
                        </software>
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                    <number_images_used>77066</number_images_used>
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                <initial_angle_assignment>
                    <type>RANDOM ASSIGNMENT</type>
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            </singleparticle_processing>
        </structure_determination>
    </structure_determination_list>
    <map format="CCP4" size_kbytes="55297">
        <file>emd_9910.map.gz</file>
        <symmetry>
            <space_group>1</space_group>
        </symmetry>
        <data_type>IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)</data_type>
        <dimensions>
            <col>240</col>
            <row>240</row>
            <sec>240</sec>
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        <origin>
            <col>0</col>
            <row>0</row>
            <sec>0</sec>
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        <spacing>
            <x>240</x>
            <y>240</y>
            <z>240</z>
        </spacing>
        <cell>
            <a units="Å">266.4</a>
            <b units="Å">266.4</b>
            <c units="Å">266.4</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>-9.415036000000001</minimum>
            <maximum>19.752928000000001</maximum>
            <average>0.031748433</average>
            <std>1.1380382</std>
        </statistics>
        <pixel_spacing>
            <x units="Å">1.11</x>
            <y units="Å">1.11</y>
            <z units="Å">1.11</z>
        </pixel_spacing>
        <contour_list>
            <contour primary="true">
                <level>4.95</level>
                <source>AUTHOR</source>
            </contour>
        </contour_list>
        <label>::::EMDATABANK.org::::EMD-9910::::</label>
        <annotation_details>The cryo-EM map of Apo-bacterioferritin from Streptomyces coelicolor</annotation_details>
    </map>
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