<emd xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" emdb_id="EMD-3357" version="3.0.1.1" 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>PDBe</processing_site>
      </current_status>
      <sites>
         <deposition>PDBe</deposition>
         <last_processing>PDBe</last_processing>
      </sites>
      <key_dates>
         <deposition>2016-03-02</deposition>
         <header_release>2016-04-06</header_release>
         <map_release>2016-07-20</map_release>
         <update>2017-07-26</update>
      </key_dates>
      <title>electron density map of murine leukaemia virus envelope glycoprotein tagged in the proline rich region with YFP as reconstructed by subtomogram averaging on viruses produced in DFJ8 cells</title>
      <authors_list>
         <author>Riedel C</author>
         <author>Vasishtan D</author>
         <author>Siebert CA</author>
         <author>Whittle C</author>
         <author>Lehmann MJ</author>
         <author>Mothes W</author>
         <author>Grunewald K</author>
      </authors_list>
      <keywords>murine leukemia virus, retrovirus, envelope glycoprotein, cryo electron tomography, subtomogram averaging</keywords>
   </admin>
   <crossreferences>
      <citation_list>
         <primary_citation>
            <journal_citation published="true">
               <author order="1">Riedel C</author>
               <author order="2">Vasishtan D</author>
               <author order="3">Siebert CA</author>
               <author order="4">Whittle C</author>
               <author order="5">Lehmann MJ</author>
               <author order="6">Mothes W</author>
               <author order="7">Grunewald K</author>
               <title>Native structure of a retroviral envelope protein and its conformational change upon interaction with the target cell.</title>
               <journal>J.STRUCT.BIOL.</journal>
               <volume>197</volume>
               <first_page>172</first_page>
               <last_page>180</last_page>
               <year>2017</year>
               <external_references type="PUBMED">27345930</external_references>
               <external_references type="DOI">doi:10.1016/j.jsb.2016.06.017</external_references>
            </journal_citation>
         </primary_citation>
      </citation_list>
   </crossreferences>
   <sample>
      <name>murine leukemia virus Env protein, tagged in the proline rich region with YFP, on murine leukemia virus particles</name>
      <supramolecule_list>
         <sample_supramolecule supramolecule_id="1000">
            <name>murine leukemia virus Env protein, tagged in the proline rich region with YFP, on murine leukemia virus particles</name>
            <details>purified virus particles produced in DFJ8 cells</details>
            <oligomeric_state>trimer</oligomeric_state>
            <number_unique_components>1</number_unique_components>
            <molecular_weight>
               <theoretical units="MDa">0.437</theoretical>
            </molecular_weight>
         </sample_supramolecule>
      </supramolecule_list>
      <macromolecule_list>
         <protein_or_peptide macromolecule_id="1">
            <name>murine leukemia virus Env protein</name>
            <natural_source database="NCBI">
               <organism ncbi="11786">Murine leukemia virus</organism>
               <strain>Friend's murine leukemia virus</strain>
            </natural_source>
            <molecular_weight>
               <theoretical units="MDa">0.437</theoretical>
            </molecular_weight>
            <details>tagged in the proline rich region with YFP, imaged on intact virus particles</details>
            <number_of_copies>3</number_of_copies>
            <oligomeric_state>trimer</oligomeric_state>
            <recombinant_exp_flag>false</recombinant_exp_flag>
            <recombinant_expression database="NCBI">
               </recombinant_expression>
            <sequence>
               </sequence>
         </protein_or_peptide>
      </macromolecule_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>
                  <details>DMEM + 10% FSC</details>
               </buffer>
               <grid>
                  <details>C-flat copper grids (Protochips, CF-2/1-2C)</details>
               </grid>
               <vitrification>
                  <cryogen_name>ETHANE-PROPANE MIXTURE</cryogen_name>
                  <instrument>OTHER</instrument>
                  <method>manually blotted for 3sec</method>
               </vitrification>
            </subtomogram_averaging_preparation>
         </specimen_preparation_list>
         <microscopy_list>
            <subtomogram_averaging_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_defocus_min units="&#181;m">1.5</nominal_defocus_min>
               <nominal_defocus_max units="&#181;m">5.0</nominal_defocus_max>
               <calibrated_magnification>95000.0</calibrated_magnification>
               <specimen_holder_model>OTHER</specimen_holder_model>
               <specialist_optics>
                  <energy_filter>
                     <name>Gatan QUANTUM 964 postcolumn energy filter</name>
                     <lower_energy_threshold units="eV">0.0</lower_energy_threshold>
                     <upper_energy_threshold units="eV">20.0</upper_energy_threshold>
                  </energy_filter>
               </specialist_optics>
               <date>2014-08-13</date>
               <image_recording_list>
                  <image_recording>
                     <film_or_detector_model category="CCD">GATAN K2 SUMMIT (4k x 4k)</film_or_detector_model>
                     <average_electron_dose_per_image units="e/&#8491;^2">60</average_electron_dose_per_image>
                  </image_recording>
               </image_recording_list>
               <tilt_series>
                  <axis1>
                     <min_angle units="deg">-45</min_angle>
                     <max_angle units="deg">45</max_angle>
                  </axis1>
               </tilt_series>
            </subtomogram_averaging_microscopy>
         </microscopy_list>
         <subtomogram_averaging_processing image_processing_id="1">
            <details>particles were picked manually</details>
            <final_reconstruction>
               <applied_symmetry>
                  <point_group>C3</point_group>
               </applied_symmetry>
               <resolution res_type="BY AUTHOR" units="&#8491;">20.0</resolution>
               <resolution_method>OTHER</resolution_method>
               <software_list>
                  <software>
                     <name>motioncorr, IMOD, TomoCTF, PEET</name>
                  </software>
               </software_list>
               <details>Images were aligned using motioncorr. Tomograms were reconstructed using weighted back projection. CTF correction was performed employing TomoCTF. PEET was used for the generation of the subtomogram average.</details>
               <number_subtomograms_used>2241</number_subtomograms_used>
            </final_reconstruction>
         </subtomogram_averaging_processing>
      </structure_determination>
   </structure_determination_list>
   <map format="CCP4" size_kbytes="845">
      <file>emd_3357.map.gz</file>
      <symmetry>
         <space_group>1</space_group>
      </symmetry>
      <data_type>IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)</data_type>
      <dimensions>
         <col>60</col>
         <row>60</row>
         <sec>60</sec>
      </dimensions>
      <origin>
         <col>0</col>
         <row>0</row>
         <sec>0</sec>
      </origin>
      <spacing>
         <x>60</x>
         <y>60</y>
         <z>60</z>
      </spacing>
      <cell>
         <a units="&#8491;">276.0</a>
         <b units="&#8491;">276.0</b>
         <c units="&#8491;">276.0</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>-0.02051544</minimum>
         <maximum>15.44012833</maximum>
         <average>7.0263629</average>
         <std>1.63033259</std>
      </statistics>
      <pixel_spacing>
         <x units="&#8491;">4.6</x>
         <y units="&#8491;">4.6</y>
         <z units="&#8491;">4.6</z>
      </pixel_spacing>
      <contour_list>
         <contour primary="true">
            <level>9.199999999999999</level>
            <source>AUTHOR</source>
         </contour>
      </contour_list>
      <annotation_details>reconstruction of virus bound murine leukemia virus Env tagged in the proline rich region with YFP</annotation_details>
      <details>::::EMDATABANK.org::::EMD-3357::::</details>
   </map>
   <interpretation>
      <modelling_list>
         <modelling>
            <initial_model>
               <access_code>1aol</access_code>
               <chain>
                  <chain_id>A</chain_id>
               </chain>
            </initial_model>
            <refinement_protocol>RIGID BODY FIT</refinement_protocol>
            <software_list>
               <software>
                  <name>Chimera</name>
               </software>
            </software_list>
            <refinement_space>REAL</refinement_space>
         </modelling>
      </modelling_list>
      <figure_list>
         <figure>
            <file>emd_3357.tif</file>
         </figure>
      </figure_list>
   </interpretation>
   <validation>
      <fsc_curve>
         <file>emd_3357_fsc.xml</file>
      </fsc_curve>
   </validation>
</emd>