<emd xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" emdb_id="EMD-1021" 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>2003-01-31</deposition>
         <header_release>2003-01-31</header_release>
         <map_release>2003-03-31</map_release>
         <update>2012-10-17</update>
      </key_dates>
      <title>Structure of a viral DNA gatekeeper at 10 A resolution by cryo-electron microscopy.</title>
      <authors_list>
         <author>Orlova EV</author>
         <author>Gowen B</author>
         <author>Droege A</author>
         <author>Stiege A</author>
         <author>Weise F</author>
         <author>Lurz R</author>
         <author>van Heel M</author>
         <author>Tavares P</author>
      </authors_list>
      <keywords>
         </keywords>
   </admin>
   <crossreferences>
      <citation_list>
         <primary_citation>
            <journal_citation published="true">
               <author order="1">Orlova EV</author>
               <author order="2">Gowen B</author>
               <author order="3">Droge A</author>
               <author order="4">Stiege A</author>
               <author order="5">Weise F</author>
               <author order="6">Lurz R</author>
               <author order="7">van Heel M</author>
               <author order="8">Tavares P</author>
               <title>Structure of a viral DNA gatekeeper at 10 A resolution by cryo-electron microscopy.</title>
               <journal>EMBO J.</journal>
               <volume>22</volume>
               <first_page>1255</first_page>
               <last_page>1262</last_page>
               <year>2003</year>
               <external_references type="PUBMED">12628918</external_references>
               <external_references type="DOI">doi:10.1093/emboj/cdg123</external_references>
            </journal_citation>
         </primary_citation>
      </citation_list>
   </crossreferences>
   <sample>
      <name>Bacteriophage SPP1 connector</name>
      <supramolecule_list>
         <sample_supramolecule supramolecule_id="1000">
            <name>Bacteriophage SPP1 connector</name>
            <oligomeric_state>cyclical dodecamer</oligomeric_state>
            <number_unique_components>3</number_unique_components>
            <molecular_weight>
               <experimental units="MDa">1.0</experimental>
               <theoretical units="MDa">0.96</theoretical>
            </molecular_weight>
         </sample_supramolecule>
      </supramolecule_list>
      <macromolecule_list>
         <protein_or_peptide macromolecule_id="1">
            <name synonym="gp6">Bacteriophage SPP1 portal protein gp6</name>
            <natural_source database="NCBI">
               <organism ncbi="10724">Bacillus phage SPP1</organism>
               <strain>Bacilus subtilis YB886 with mutant phage SPP1sus9</strain>
               <synonym_organism>bacteriophage SPP1</synonym_organism>
            </natural_source>
            <molecular_weight>
               <experimental units="MDa">0.0573</experimental>
               <theoretical units="MDa">0.0573</theoretical>
            </molecular_weight>
            <number_of_copies>12</number_of_copies>
            <oligomeric_state>cyclical dodecamer</oligomeric_state>
            <recombinant_exp_flag>false</recombinant_exp_flag>
            <recombinant_expression database="NCBI">
               </recombinant_expression>
            <sequence>
               </sequence>
         </protein_or_peptide>
         <protein_or_peptide macromolecule_id="2">
            <name synonym="head completion protein">gp15</name>
            <natural_source database="NCBI">
               <organism ncbi="10724">Bacillus phage SPP1</organism>
               <strain>Bacilus subtilis YB886 with mutant phage SPP1sus9</strain>
               <synonym_organism>bacteriophage SPP1</synonym_organism>
            </natural_source>
            <molecular_weight>
               <experimental units="MDa">0.0116</experimental>
               <theoretical units="MDa">0.0112</theoretical>
            </molecular_weight>
            <number_of_copies>12</number_of_copies>
            <oligomeric_state>cyclical dodecamer</oligomeric_state>
            <recombinant_exp_flag>false</recombinant_exp_flag>
            <recombinant_expression database="NCBI">
               </recombinant_expression>
            <sequence>
               </sequence>
         </protein_or_peptide>
         <protein_or_peptide macromolecule_id="3">
            <name synonym="gp16">head completion protein gp16</name>
            <natural_source database="NCBI">
               <organism ncbi="10724">Bacillus phage SPP1</organism>
               <synonym_organism>bacteriophage SPP1</synonym_organism>
            </natural_source>
            <molecular_weight>
               <experimental units="MDa">12.5</experimental>
               <theoretical units="MDa">12.1</theoretical>
            </molecular_weight>
            <number_of_copies>12</number_of_copies>
            <oligomeric_state>cyclical dodecamer</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>singleParticle</method>
         <aggregation_state>particle</aggregation_state>
         <specimen_preparation_list>
            <single_particle_preparation preparation_id="1">
               <concentration units="mg/mL">0.9</concentration>
               <buffer>
                  <ph>7.5</ph>
               </buffer>
               <vitrification>
                  <cryogen_name>ETHANE</cryogen_name>
                  <instrument>HOMEMADE PLUNGER</instrument>
                  <details>Vitrification instrument: general plunger</details>
                  <method>blot for 2-3 second before plunging</method>
               </vitrification>
            </single_particle_preparation>
         </specimen_preparation_list>
         <microscopy_list>
            <single_particle_microscopy microscopy_id="1">
               <microscope>FEI/PHILIPS CM200FEG/ST</microscope>
               <illumination_mode>FLOOD BEAM</illumination_mode>
               <imaging_mode>BRIGHT FIELD</imaging_mode>
               <electron_source>FIELD EMISSION GUN</electron_source>
               <acceleration_voltage units="kV">200</acceleration_voltage>
               <nominal_cs units="mm">2.1</nominal_cs>
               <nominal_defocus_min units="&#181;m">1.7</nominal_defocus_min>
               <nominal_defocus_max units="&#181;m">3.0</nominal_defocus_max>
               <nominal_magnification>50000.0</nominal_magnification>
               <calibrated_magnification>48600.0</calibrated_magnification>
               <specimen_holder_model>GATAN LIQUID NITROGEN</specimen_holder_model>
               <temperature>
                  <temperature_average units="K">90</temperature_average>
               </temperature>
               <date>1999-01-01</date>
               <image_recording_list>
                  <image_recording>
                     <film_or_detector_model category="FILM">KODAK SO-163 FILM</film_or_detector_model>
                     <digitization_details>
                        <scanner>PATCHWORK DENSITOMETER</scanner>
                        <sampling_interval units="&#181;m">10.2</sampling_interval>
                     </digitization_details>
                     <number_real_images>21</number_real_images>
                     <average_electron_dose_per_image units="e/&#8491;^2">10</average_electron_dose_per_image>
                     <od_range>1.8</od_range>
                     <bits_per_pixel>8.</bits_per_pixel>
                  </image_recording>
               </image_recording_list>
               <specimen_holder>side-entry</specimen_holder>
            </single_particle_microscopy>
         </microscopy_list>
         <singleparticle_processing image_processing_id="1">
            <ctf_correction>
               <details>Each particle</details>
            </ctf_correction>
            <final_reconstruction>
               <applied_symmetry>
                  <point_group>C12</point_group>
               </applied_symmetry>
               <algorithm>OTHER</algorithm>
               <resolution res_type="BY AUTHOR" units="&#8491;">10.0</resolution>
               <resolution_method>OTHER</resolution_method>
               <software_list>
                  <software>
                     <name>Imagic</name>
                  </software>
               </software_list>
               <number_images_used>4700</number_images_used>
            </final_reconstruction>
            <final_two_d_classification>
               <number_classes>260</number_classes>
            </final_two_d_classification>
         </singleparticle_processing>
      </structure_determination>
   </structure_determination_list>
   <map format="CCP4" size_kbytes="6751">
      <file>emd_1021.map.gz</file>
      <symmetry>
         <space_group>1</space_group>
      </symmetry>
      <data_type>IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)</data_type>
      <dimensions>
         <col>120</col>
         <row>120</row>
         <sec>120</sec>
      </dimensions>
      <origin>
         <col>0</col>
         <row>0</row>
         <sec>0</sec>
      </origin>
      <spacing>
         <x>120</x>
         <y>120</y>
         <z>120</z>
      </spacing>
      <cell>
         <a units="&#8491;">252</a>
         <b units="&#8491;">252</b>
         <c units="&#8491;">252</c>
         <alpha units="deg">90</alpha>
         <beta units="deg">90</beta>
         <gamma units="deg">90</gamma>
      </cell>
      <axis_order>
         <fast>X</fast>
         <medium>Y</medium>
         <slow>Z</slow>
      </axis_order>
      <statistics>
         <minimum>-0.4</minimum>
         <maximum>0.329371</maximum>
         <average>0.00307451</average>
         <std>0.0393709</std>
      </statistics>
      <pixel_spacing>
         <x units="&#8491;">2.1</x>
         <y units="&#8491;">2.1</y>
         <z units="&#8491;">2.1</z>
      </pixel_spacing>
      <contour_list>
         <contour primary="true">
            <level>0.0747</level>
         </contour>
      </contour_list>
      <annotation_details>Viral DNA gatekeeper.   Centre of symmetry is 60.0,60.0,60.0</annotation_details>
      <details>::::EMDATABANK.org::::EMD-1021::::</details>
   </map>
   <interpretation>
      <figure_list>
         <figure>
            <file>emd_1021.tif</file>
         </figure>
      </figure_list>
   </interpretation>
</emd>