<emd xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" emdb_id="EMD-1468" 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>2008-02-05</deposition>
         <header_release>2008-02-07</header_release>
         <map_release>2009-03-31</map_release>
         <update>2009-03-31</update>
      </key_dates>
      <title>Virus-like particle of Human Parvovirus B19 (VLP consisting of VP2 only)</title>
      <authors_list>
         <author>Kaufmann B</author>
         <author>Chipman PR</author>
         <author>Modrow S</author>
         <author>Rossmann MG</author>
      </authors_list>
      <keywords>icosahedral, VLP, B19, VP2, recombinant</keywords>
   </admin>
   <crossreferences>
      <citation_list>
         <primary_citation>
            <journal_citation published="true">
               <author order="1">Kaufmann B</author>
               <author order="2">Chipman PR</author>
               <author order="3">Kostyuchenko VA</author>
               <author order="4">Modrow S</author>
               <author order="5">Rossmann MG</author>
               <title>Visualization of the externalized VP2 N termini of infectious human parvovirus B19.</title>
               <journal>J.VIROL.</journal>
               <volume>82</volume>
               <first_page>7306</first_page>
               <last_page>7312</last_page>
               <year>2008</year>
               <external_references type="PUBMED">18508892</external_references>
               <external_references type="DOI">doi:10.1128/JVI.00512-08</external_references>
            </journal_citation>
         </primary_citation>
         <secondary_citation>
            <journal_citation published="true">
               <author order="1">Kaufmann B</author>
               <author order="2">Baxa U</author>
               <author order="3">Chipman PR</author>
               <author order="4">Rossmann MG</author>
               <author order="5">Modrow S</author>
               <author order="6">Seckler R</author>
               <title>Parvovirus B19 does not bind to membrane-associated globoside in vitro</title>
               <journal>VIROLOGY</journal>
               <volume>332</volume>
               <first_page>189</first_page>
               <last_page>198</last_page>
               <year>2005</year>
               <external_references type="PUBMED">
                  </external_references>
            </journal_citation>
         </secondary_citation>
      </citation_list>
   </crossreferences>
   <sample>
      <name>Virus-like particles of Human Parvovirus B19 (VP2 only, B19 VP2 VLP)</name>
      <supramolecule_list>
         <sample_supramolecule supramolecule_id="1000">
            <name>Virus-like particles of Human Parvovirus B19 (VP2 only, B19 VP2 VLP)</name>
            <details>icosahedral particle, virus-like particle, recombinant VP2, non-enveloped protein shell</details>
            <oligomeric_state>60 VP2 subunits form icosahedral protein shell encapsidating 5.6kb ssDNA genome</oligomeric_state>
            <number_unique_components>1</number_unique_components>
            <molecular_weight>
               <theoretical units="MDa">3.48</theoretical>
            </molecular_weight>
         </sample_supramolecule>
         <virus_supramolecule supramolecule_id="1">
            <name synonym="Human Parvovirus B19">Human parvovirus B19</name>
            <details>virus-like particles (VLP) self-assembled from recombinant VP2 only</details>
            <sci_species_name ncbi="10798">Human parvovirus B19</sci_species_name>
            <natural_host database="NCBI">
               <organism ncbi="9606">Homo sapiens</organism>
               <synonym_organism>VERTEBRATES</synonym_organism>
            </natural_host>
            <host_system database="NCBI">
               </host_system>
            <molecular_weight>
               <theoretical units="MDa">3.48</theoretical>
            </molecular_weight>
            <virus_shell shell_id="1">
               <diameter units="&#8491;">260</diameter>
               <triangulation>1</triangulation>
            </virus_shell>
            <virus_type>VIRUS-LIKE PARTICLE</virus_type>
            <virus_isolate>SPECIES</virus_isolate>
            <virus_enveloped>false</virus_enveloped>
            <virus_empty>true</virus_empty>
            <syn_species_name>Human Parvovirus B19</syn_species_name>
         </virus_supramolecule>
      </supramolecule_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">2</concentration>
               <buffer>
                  <ph>7.5</ph>
                  <details>10mM Tris-HCl</details>
               </buffer>
               <grid>
                  <details>400 mesh copper</details>
               </grid>
               <vitrification>
                  <cryogen_name>ETHANE</cryogen_name>
                  <instrument>HOMEMADE PLUNGER</instrument>
                  <details>Vitrification instrument: guillotine-style plunge freezing device</details>
                  <method>A small vial of ethane is placed inside a larger liquid nitrogen reservoir. The grid holding a few microliters of the sample is held in place at the bottom of a plunger by the means of fine tweezers. Once the ethane in the vial is completely frozen, it needs to be slightly melted. When the liquid ethane is ready, a piece of filter paper is then pressed against the sample to blot of excess buffer, sufficient to leave a thin layer on the grid. After a predetermined time, the filter paper is removed, and the plunger is allowed to drop into the liquid ethane. Once the grid enters the liquid ethane, the sample is rapidly frozen, and the grid is transferred under liquid nitrogen to a storage box immersed liquid nitrogen for later use in the microscope.</method>
               </vitrification>
            </single_particle_preparation>
         </specimen_preparation_list>
         <microscopy_list>
            <single_particle_microscopy microscopy_id="1">
               <microscope>FEI/PHILIPS CM300FEG/T</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">0.73</nominal_defocus_min>
               <nominal_defocus_max units="&#181;m">3.296</nominal_defocus_max>
               <nominal_magnification>45000.0</nominal_magnification>
               <calibrated_magnification>47000.0</calibrated_magnification>
               <specimen_holder_model>GATAN LIQUID NITROGEN</specimen_holder_model>
               <temperature>
                  <temperature_average units="K">98</temperature_average>
               </temperature>
               <alignment_procedure>
                  <legacy>
                     <astigmatism>live FFT at 200K</astigmatism>
                  </legacy>
               </alignment_procedure>
               <details>low dose</details>
               <image_recording_list>
                  <image_recording>
                     <film_or_detector_model category="FILM">KODAK SO-163 FILM</film_or_detector_model>
                     <digitization_details>
                        <scanner>ZEISS SCAI</scanner>
                        <sampling_interval units="&#181;m">14</sampling_interval>
                     </digitization_details>
                     <number_real_images>17</number_real_images>
                     <average_electron_dose_per_image units="e/&#8491;^2">21</average_electron_dose_per_image>
                     <bits_per_pixel>8.</bits_per_pixel>
                  </image_recording>
               </image_recording_list>
               <specimen_holder>Eucentric</specimen_holder>
               <tilt_angle_min>0</tilt_angle_min>
               <tilt_angle_max>0</tilt_angle_max>
            </single_particle_microscopy>
         </microscopy_list>
         <singleparticle_processing image_processing_id="1">
            <details>manual particle selection</details>
            <ctf_correction>
               <details>each particle</details>
            </ctf_correction>
            <final_reconstruction>
               <applied_symmetry>
                  <point_group>I</point_group>
               </applied_symmetry>
               <algorithm>OTHER</algorithm>
               <resolution res_type="BY AUTHOR" units="&#8491;">7.7</resolution>
               <resolution_method>FSC 0.5 CUT-OFF</resolution_method>
               <software_list>
                  <software>
                     <name>EMPFT,  POR,  P3DR</name>
                  </software>
               </software_list>
               <details>final map includes data to 6.7 Ang resolution (fsc 0.3 cut-off), magnification of final map standardized to a map calculated from B19 VP2 VLP model coordinates (PDB accession no 1S58) resulting in final pixel separation of 2.8745Ang</details>
               <number_images_used>4555</number_images_used>
            </final_reconstruction>
         </singleparticle_processing>
      </structure_determination>
   </structure_determination_list>
   <map format="CCP4" size_kbytes="5344">
      <file>emd_1468.map.gz</file>
      <symmetry>
         <space_group>1</space_group>
      </symmetry>
      <data_type>IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)</data_type>
      <dimensions>
         <col>111</col>
         <row>111</row>
         <sec>111</sec>
      </dimensions>
      <origin>
         <col>-55</col>
         <row>-55</row>
         <sec>-55</sec>
      </origin>
      <spacing>
         <x>111</x>
         <y>111</y>
         <z>111</z>
      </spacing>
      <cell>
         <a units="&#8491;">319.07</a>
         <b units="&#8491;">319.07</b>
         <c units="&#8491;">319.07</c>
         <alpha units="deg">90</alpha>
         <beta units="deg">90</beta>
         <gamma units="deg">90</gamma>
      </cell>
      <axis_order>
         <fast>Y</fast>
         <medium>X</medium>
         <slow>Z</slow>
      </axis_order>
      <statistics>
         <minimum>-15.162000000000001</minimum>
         <maximum>39.637</maximum>
         <average>2.99359</average>
         <std>7.35254</std>
      </statistics>
      <pixel_spacing>
         <x units="&#8491;">2.8745</x>
         <y units="&#8491;">2.8745</y>
         <z units="&#8491;">2.8745</z>
      </pixel_spacing>
      <contour_list>
         <contour primary="true">
            <level>10.300000000000001</level>
         </contour>
      </contour_list>
      <annotation_details>Virus-like particle of Human Parvovirus B19 (VP2 only)</annotation_details>
      <details>::::EMDATABANK.org::::EMD-1468::::</details>
   </map>
</emd>