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         <last_processing>PDBe</last_processing>
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      <key_dates>
         <deposition>2009-07-15</deposition>
         <header_release>2009-07-15</header_release>
         <map_release>2009-10-20</map_release>
         <update>2009-10-20</update>
      </key_dates>
      <title>A dimeric structure for archaeal methylation-guide small ribonucleoproteins</title>
      <authors_list>
         <author>Bleichert F</author>
         <author>Gagnon KT</author>
         <author>Brown II BA</author>
         <author>Maxwell ES</author>
         <author>Leschziner AE</author>
         <author>Unger VM</author>
         <author>Baserga SJ</author>
      </authors_list>
      <keywords>
         </keywords>
   </admin>
   <crossreferences>
      <citation_list>
         <primary_citation>
            <journal_citation published="true">
               <author order="1">Bleichert F</author>
               <author order="2">Gagnon KT</author>
               <author order="3">Brown BA</author>
               <author order="4">Maxwell ES</author>
               <author order="5">Leschziner AE</author>
               <author order="6">Unger VM</author>
               <author order="7">Baserga SJ</author>
               <title>A dimeric structure for archaeal box C/D small ribonucleoproteins.</title>
               <journal>SCIENCE</journal>
               <volume>325</volume>
               <first_page>1384</first_page>
               <last_page>1387</last_page>
               <year>2009</year>
               <external_references type="PUBMED">19745151</external_references>
               <external_references type="DOI">doi:10.1126/science.1176099</external_references>
            </journal_citation>
         </primary_citation>
      </citation_list>
   </crossreferences>
   <sample>
      <name>Methanocaldococcus jannaschii methylation-guide sRNP</name>
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         <sample_supramolecule supramolecule_id="1000">
            <name>Methanocaldococcus jannaschii methylation-guide sRNP</name>
            <number_unique_components>1</number_unique_components>
            <molecular_weight>
               <theoretical units="MDa">0.366</theoretical>
            </molecular_weight>
         </sample_supramolecule>
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      <macromolecule_list>
         <protein_or_peptide macromolecule_id="1">
            <name synonym="RNP">Ribonucleoprotein</name>
            <natural_source database="NCBI">
               <organism ncbi="2190">Methanocaldococcus jannaschii</organism>
            </natural_source>
            <recombinant_exp_flag>true</recombinant_exp_flag>
            <recombinant_expression database="NCBI">
               <recombinant_organism ncbi="562">Escherichia coli</recombinant_organism>
            </recombinant_expression>
            <sequence>
               </sequence>
         </protein_or_peptide>
      </macromolecule_list>
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                  <details>20mM Hepes, 500mM NaCl, 1.5mM MgCl2</details>
               </buffer>
               <staining>
                  <type>NEGATIVE</type>
                  <details>Sandwiched, 2% uranyl formate</details>
               </staining>
               <vitrification>
                  <cryogen_name>NONE</cryogen_name>
                  <instrument>OTHER</instrument>
               </vitrification>
            </single_particle_preparation>
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               <microscope>FEI TECNAI 12</microscope>
               <illumination_mode>FLOOD BEAM</illumination_mode>
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