<emd emdb_id="EMD-6559" version="3.0.1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="https://github.com/emdb-empiar/emdb-schemas/blob/master/v3/v3_0_1_1/emdb_relaxed.xsd">
    <admin>
        <current_status>
            <code>REL</code>
            <processing_site>RCSB</processing_site>
        </current_status>
        <sites>
            <deposition>RCSB</deposition>
            <last_processing>RCSB</last_processing>
        </sites>
        <key_dates>
            <deposition>2015-12-17</deposition>
            <header_release>2016-02-17</header_release>
            <map_release>2016-03-09</map_release>
            <update>2016-03-09</update>
        </key_dates>
        <title>Cryo-electron microscopy structure of ribosome-bound initiation factor 2 70S IC II state</title>
        <authors_list>
            <author>Sprink T</author>
            <author>Ramrath DJF</author>
            <author>Yamamoto H</author>
            <author>Yamamoto K</author>
            <author>Loerke J</author>
            <author>Ismer J</author>
            <author>Hildebrand PW</author>
            <author>Scheerer P</author>
            <author>Buerger J</author>
            <author>Mielke T</author>
            <author>Spahn CMT</author>
        </authors_list>
        <keywords>translation initiation, ribosome, initiation, Initiation Factor 2, 70S initiation complex, prokaryotes, GTPase, translation GTPAse</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author order="1">Sprink T</author>
                    <author order="2">Ramrath DJF</author>
                    <author order="3">Yamamoto H</author>
                    <author order="4">Yamamoto K</author>
                    <author order="5">Loerke J</author>
                    <author order="6">Ismer J</author>
                    <author order="7">Hildebrand PW</author>
                    <author order="8">Scheerer P</author>
                    <author order="9">Buerger J</author>
                    <author order="10">Mielke T</author>
                    <author order="11">Spahn CMT</author>
                    <title>Structures of ribosome bound initiation factor 2 reveal the mechanism of subunit association</title>
                    <journal>SCI ADV</journal>
                    <volume>2</volume>
                    <first_page>e1501502</first_page>
                    <last_page>e1501502</last_page>
                    <year>2016</year>
                </journal_citation>
            </primary_citation>
        </citation_list>
        <pdb_list>
            <pdb_reference>
                <pdb_id>3jcj</pdb_id>
                <relationship>
                    <in_frame>FULLOVERLAP</in_frame>
                </relationship>
            </pdb_reference>
        </pdb_list>
    </crossreferences>
    <sample>
        <name>Escherichia coli Initiation Factor 2 stalled on Escherichia coli 70S ribosomes by the non-hydrolysable GTP analogue GDPNP in the presence of fMet-tRNAiMet and mRNA</name>
        <supramolecule_list>
            <sample_supramolecule supramolecule_id="1000">
                <name>Escherichia coli Initiation Factor 2 stalled on Escherichia coli 70S ribosomes by the non-hydrolysable GTP analogue GDPNP in the presence of fMet-tRNAiMet and mRNA</name>
                <number_unique_components>3</number_unique_components>
                <molecular_weight>
                    <experimental units="MDa">2.5</experimental>
                    <theoretical units="MDa">2.6</theoretical>
                </molecular_weight>
            </sample_supramolecule>
            <complex_supramolecule supramolecule_id="1">
                <name synonym="70S">70S ribosome</name>
                <recombinant_exp_flag>false</recombinant_exp_flag>
                <natural_source database="NCBI">
                    <organism ncbi="562">Escherichia coli</organism>
                </natural_source>
                <recombinant_expression database="NCBI" />
                <molecular_weight>
                    <experimental units="MDa">2.5</experimental>
                    <theoretical units="MDa">2.6</theoretical>
                </molecular_weight>
                <ribosome-details>ribosome-prokaryote: ALL</ribosome-details>
            </complex_supramolecule>
        </supramolecule_list>
        <macromolecule_list>
            <rna macromolecule_id="1">
                <name synonym="initiator tRNA">fMet-tRNAiMet</name>
                <natural_source database="NCBI">
                    <organism ncbi="562">Escherichia coli</organism>
                </natural_source>
                <classification>TRANSFER</classification>
                <structure>DOUBLE HELIX</structure>
                <synthetic_flag>false</synthetic_flag>
            </rna>
            <protein_or_peptide macromolecule_id="2">
                <name synonym="IF2">Initiation Factor 2</name>
                <natural_source database="NCBI">
                    <organism ncbi="562">Escherichia coli</organism>
                </natural_source>
                <molecular_weight>
                    <experimental units="MDa">0.097</experimental>
                    <theoretical units="MDa">0.097</theoretical>
                </molecular_weight>
                <details>bound to GNPPNP</details>
                <number_of_copies>1</number_of_copies>
                <recombinant_exp_flag>true</recombinant_exp_flag>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="562">Escherichia coli</recombinant_organism>
                    <recombinant_plasmid>pQE-60</recombinant_plasmid>
                </recombinant_expression>
                <sequence>
                    <external_references type="UNIPROTKB">P0A705</external_references>
                </sequence>
            </protein_or_peptide>
        </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">
                    <buffer>
                        <ph>7.5</ph>
                        <details>20 mM HEPES-KOH, pH 7.5, 15 mM magnesium acetate, 150 mM potassium acetate, 4 mM 2-mercapthoethanol, 2 mM spermidine, 0.05 mM spermine</details>
                    </buffer>
                    <grid>
                        <details>Quantifoil R3-3 Cu 300 mesh with 2 nm carbon support film</details>
                    </grid>
                    <vitrification>
                        <cryogen_name>ETHANE</cryogen_name>
                        <chamber_humidity units="percentage">100</chamber_humidity>
                        <instrument>FEI VITROBOT MARK I</instrument>
                        <method>Blot for 2-4 seconds before plunging.</method>
                    </vitrification>
                </single_particle_preparation>
            </specimen_preparation_list>
            <microscopy_list>
                <single_particle_microscopy microscopy_id="1">
                    <microscope>FEI POLARA 300</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">2.0</nominal_cs>
                    <nominal_defocus_min units="&#181;m">0.64</nominal_defocus_min>
                    <nominal_defocus_max units="&#181;m">7.18</nominal_defocus_max>
                    <nominal_magnification>31000.0</nominal_magnification>
                    <calibrated_magnification>39000.0</calibrated_magnification>
                    <specimen_holder_model>GATAN LIQUID NITROGEN</specimen_holder_model>
                    <date>2013-08-26</date>
                    <image_recording_list>
                        <image_recording>
                            <film_or_detector_model category="CCD">GATAN K2 SUMMIT (4k x 4k)</film_or_detector_model>
                            <number_real_images>918</number_real_images>
                            <average_electron_dose_per_image units="e/&#8491;^2">20</average_electron_dose_per_image>
                            <details>Automated data collection using Leginon</details>
                        </image_recording>
                    </image_recording_list>
                </single_particle_microscopy>
                <single_particle_microscopy microscopy_id="2">
                    <microscope>FEI POLARA 300</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">2.0</nominal_cs>
                    <nominal_defocus_min units="&#181;m">0.19</nominal_defocus_min>
                    <nominal_defocus_max units="&#181;m">7.57</nominal_defocus_max>
                    <nominal_magnification>31000.0</nominal_magnification>
                    <calibrated_magnification>39000.0</calibrated_magnification>
                    <specimen_holder_model>GATAN LIQUID NITROGEN</specimen_holder_model>
                    <date>2015-06-10</date>
                    <image_recording_list>
                        <image_recording>
                            <film_or_detector_model category="CCD">GATAN K2 SUMMIT (4k x 4k)</film_or_detector_model>
                            <number_real_images>2797</number_real_images>
                            <average_electron_dose_per_image units="e/&#8491;^2">20</average_electron_dose_per_image>
                            <details>Automated data collection using Leginon</details>
                        </image_recording>
                    </image_recording_list>
                </single_particle_microscopy>
            </microscopy_list>
            <singleparticle_processing image_processing_id="1">
                <details>To avoid overfitting, the data was refined in a resolution-limited scheme using SPIDER.</details>
                <ctf_correction>
                    <details>CTFFIND4</details>
                </ctf_correction>
                <final_reconstruction>
                    <resolution res_type="BY AUTHOR" units="&#8491;">3.7</resolution>
                    <resolution_method>OTHER</resolution_method>
                    <software_list>
                        <software>
                            <name>EMAN2, CTFFIND4, SPIDER, SPARX</name>
                        </software>
                    </software_list>
                    <details>Final maps were calculated from two combined datasets. To avoid overfitting, the data were refined in a resolution-limited scheme using SPIDER.</details>
                    <number_images_used>54585</number_images_used>
                </final_reconstruction>
            </singleparticle_processing>
        </structure_determination>
    </structure_determination_list>
    <map format="CCP4" size_kbytes="182251">
        <file>emd_6559.map.gz</file>
        <symmetry>
            <space_group>1</space_group>
        </symmetry>
        <data_type>IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)</data_type>
        <dimensions>
            <col>360</col>
            <row>360</row>
            <sec>360</sec>
        </dimensions>
        <origin>
            <col>0</col>
            <row>0</row>
            <sec>0</sec>
        </origin>
        <spacing>
            <x>360</x>
            <y>360</y>
            <z>360</z>
        </spacing>
        <cell>
            <a units="&#8491;">369.0</a>
            <b units="&#8491;">369.0</b>
            <c units="&#8491;">369.0</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>-6.02793121</minimum>
            <maximum>13.34954739</maximum>
            <average>0.09076034</average>
            <std>0.65751249</std>
        </statistics>
        <pixel_spacing>
            <x units="&#8491;">1.025</x>
            <y units="&#8491;">1.025</y>
            <z units="&#8491;">1.025</z>
        </pixel_spacing>
        <contour_list>
            <contour primary="true">
                <level>2.2</level>
                <source>AUTHOR</source>
            </contour>
        </contour_list>
        <annotation_details>Reconstruction of the 70S-fMet-tRNAiMet-IF2-GDPNP complex, IC II state</annotation_details>
        <details>::::EMDATABANK.org::::EMD-6559::::</details>
    </map>
    <interpretation>
        <figure_list>
            <figure>
                <file>emd_6559.png</file>
            </figure>
        </figure_list>
    </interpretation>
</emd>