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   <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>2002-06-26</deposition>
         <header_release>2002-10-17</header_release>
         <map_release>2003-10-17</map_release>
         <update>2011-05-26</update>
      </key_dates>
      <title>The DnaB.DnaC complex: a structure based on dimers assembled around an occluded channel.</title>
      <authors_list>
         <author>Barcena M</author>
         <author>Ruiz T</author>
         <author>Donate LE</author>
         <author>Brown SE</author>
         <author>Dixon NE</author>
         <author>Radermacher M</author>
         <author>Carazo JM</author>
      </authors_list>
      <keywords>
         </keywords>
   </admin>
   <crossreferences>
      <citation_list>
         <primary_citation>
            <journal_citation published="true">
               <author order="1">Barcena M</author>
               <author order="2">Ruiz T</author>
               <author order="3">Donate LE</author>
               <author order="4">Brown SE</author>
               <author order="5">Dixon NE</author>
               <author order="6">Radermacher M</author>
               <author order="7">Carazo JM</author>
               <title>The DnaB.DnaC complex: a structure based on dimers assembled around an occluded channel.</title>
               <journal>EMBO J.</journal>
               <volume>20</volume>
               <first_page>1462</first_page>
               <last_page>1468</last_page>
               <year>2001</year>
               <external_references type="PUBMED">11250911</external_references>
               <external_references type="DOI">doi:10.1093/emboj/20.6.1462</external_references>
            </journal_citation>
         </primary_citation>
      </citation_list>
   </crossreferences>
   <sample>
      <name>DnaB.DnaC complex from Escherichia coli</name>
      <supramolecule_list>
         <sample_supramolecule supramolecule_id="1000">
            <name>DnaB.DnaC complex from Escherichia coli</name>
            <oligomeric_state>one homohexamer of DnaB binds to six monomers of DnaC</oligomeric_state>
            <number_unique_components>2</number_unique_components>
            <molecular_weight>
               <theoretical units="MDa">0.48</theoretical>
            </molecular_weight>
         </sample_supramolecule>
      </supramolecule_list>
      <macromolecule_list>
         <protein_or_peptide macromolecule_id="1">
            <name>DnaB</name>
            <natural_source database="NCBI">
               <organism ncbi="562">Escherichia coli</organism>
               <cellular_location>cytoplasma</cellular_location>
            </natural_source>
            <molecular_weight>
               <theoretical units="MDa">0.31</theoretical>
            </molecular_weight>
            <number_of_copies>6</number_of_copies>
            <oligomeric_state>hexamer</oligomeric_state>
            <recombinant_exp_flag>true</recombinant_exp_flag>
            <recombinant_expression database="NCBI">
               <recombinant_organism ncbi="562">Escherichia coli</recombinant_organism>
               <recombinant_plasmid>An1459/pPA569</recombinant_plasmid>
            </recombinant_expression>
            <sequence>
               <external_references type="GO">GO:0003678</external_references>
               <external_references type="INTERPRO">IPR001198</external_references>
            </sequence>
         </protein_or_peptide>
         <protein_or_peptide macromolecule_id="2">
            <name>DnaC</name>
            <natural_source database="NCBI">
               <organism ncbi="562">Escherichia coli</organism>
               <cellular_location>cytoplasma</cellular_location>
            </natural_source>
            <molecular_weight>
               <theoretical units="MDa">0.17</theoretical>
            </molecular_weight>
            <number_of_copies>6</number_of_copies>
            <oligomeric_state>three dimers</oligomeric_state>
            <recombinant_exp_flag>true</recombinant_exp_flag>
            <recombinant_expression database="NCBI">
               <recombinant_organism ncbi="562">Escherichia coli</recombinant_organism>
               <recombinant_plasmid>An1459/pPA569</recombinant_plasmid>
            </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">0.03</concentration>
               <buffer>
                  <ph>7.6</ph>
                  <details>50 mM Tris-HCl, 25 mM NaCl 5 mM MgCl2 2 mM DTT 0.1 mM ATP</details>
               </buffer>
               <vitrification>
                  <cryogen_name>ETHANE</cryogen_name>
                  <instrument>HOMEMADE PLUNGER</instrument>
                  <details>Vitrification instrument: plunger</details>
                  <method>double-blotting</method>
               </vitrification>
            </single_particle_preparation>
         </specimen_preparation_list>
         <microscopy_list>
            <single_particle_microscopy microscopy_id="1">
               <microscope>FEI/PHILIPS CM120T</microscope>
               <illumination_mode>FLOOD BEAM</illumination_mode>
               <imaging_mode>BRIGHT FIELD</imaging_mode>
               <electron_source>LAB6</electron_source>
               <acceleration_voltage units="kV">100</acceleration_voltage>
               <nominal_cs units="mm">2.2</nominal_cs>
               <nominal_defocus_min units="&#181;m">1.0</nominal_defocus_min>
               <nominal_defocus_max units="&#181;m">2.0</nominal_defocus_max>
               <nominal_magnification>60000.0</nominal_magnification>
               <calibrated_magnification>57874.0</calibrated_magnification>
               <specimen_holder_model>GATAN LIQUID NITROGEN</specimen_holder_model>
               <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">7</sampling_interval>
                     </digitization_details>
                     <number_real_images>58</number_real_images>
                     <bits_per_pixel>8.</bits_per_pixel>
                  </image_recording>
               </image_recording_list>
               <specimen_holder>cryo-holder</specimen_holder>
               <tilt_angle_min>0</tilt_angle_min>
               <tilt_angle_max>35</tilt_angle_max>
            </single_particle_microscopy>
         </microscopy_list>
         <singleparticle_processing image_processing_id="1">
            <final_reconstruction>
               <applied_symmetry>
                  <point_group>C3</point_group>
               </applied_symmetry>
               <algorithm>OTHER</algorithm>
               <resolution res_type="BY AUTHOR" units="&#8491;">26.0</resolution>
               <resolution_method>OTHER</resolution_method>
               <software_list>
                  <software>
                     <name>SPIDER and Xmipp</name>
                  </software>
               </software_list>
               <number_images_used>7888</number_images_used>
            </final_reconstruction>
         </singleparticle_processing>
      </structure_determination>
   </structure_determination_list>
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