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    <admin>
        <current_status>
            <date>2024-05-29</date>
            <code>REL</code>
            <processing_site>RCSB</processing_site>
        </current_status>
        <sites>
            <deposition>RCSB</deposition>
            <last_processing>RCSB</last_processing>
        </sites>
        <key_dates>
            <deposition>2023-02-22</deposition>
            <header_release>2023-04-12</header_release>
            <map_release>2023-04-12</map_release>
            <update>2024-05-29</update>
        </key_dates>
        <grant_support>
            <grant_reference>
                <funding_body>National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)</funding_body>
                <code>GM136401</code>
                <country>United States</country>
            </grant_reference>
            <grant_reference>
                <funding_body>National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)</funding_body>
                <code>GM118089</code>
                <country>United States</country>
            </grant_reference>
            <grant_reference>
                <funding_body>National Institutes of Health/National Cancer Institute (NIH/NCI)</funding_body>
                <code>CA92584</code>
                <country>United States</country>
            </grant_reference>
        </grant_support>
        <title>Tetramer core subcomplex (conformation 2) of Xenopus laevis DNA polymerase alpha-primase</title>
        <authors_list>
            <author>Mullins EA</author>
            <author>Chazin WJ</author>
            <author>Eichman BF</author>
        </authors_list>
        <keywords>Primase, DNA polymerase, chimeric RNA-DNA primer, RNA/DNA hybrid, DNA replication, DNA synthesis, REPLICATION</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author ORCID="0000-0003-3834-1065" order="1">Mullins EA</author>
                    <author ORCID="0000-0001-8513-1891" order="2">Salay LE</author>
                    <author order="3">Durie CL</author>
                    <author order="4">Bradley NP</author>
                    <author order="5">Jackman JE</author>
                    <author ORCID="0000-0003-1750-4793" order="6">Ohi MD</author>
                    <author ORCID="0000-0002-2180-0790" order="7">Chazin WJ</author>
                    <author ORCID="0000-0002-0965-2297" order="8">Eichman BF</author>
                    <title>A mechanistic model of primer synthesis from catalytic structures of DNA polymerase alpha-primase.</title>
                    <journal_abbreviation>Nat.Struct.Mol.Biol.</journal_abbreviation>
                    <country>US</country>
                    <volume>31</volume>
                    <first_page>777</first_page>
                    <last_page>790</last_page>
                    <year>2024</year>
                    <external_references type="PUBMED">38491139</external_references>
                    <external_references type="DOI">doi:10.1038/s41594-024-01227-4</external_references>
                    <external_references type="ISSN">1545-9985</external_references>
                </journal_citation>
            </primary_citation>
            <secondary_citation>
                <journal_citation published="true">
                    <author ORCID="0000-0003-3834-1065" order="9">Mullins EA</author>
                    <author order="10">Salay LE</author>
                    <author ORCID="0000-0002-4027-4386" order="11">Durie CL</author>
                    <author ORCID="0000-0002-2701-3405" order="12">Bradley NP</author>
                    <author ORCID="0000-0001-9291-8852" order="13">Jackman JE</author>
                    <author ORCID="0000-0003-1750-4793" order="14">Ohi MD</author>
                    <author ORCID="0000-0002-2180-0790" order="15">Chazin WJ</author>
                    <author ORCID="0000-0002-0965-2297" order="16">Eichman BF</author>
                    <title>A mechanistic model of primer synthesis from catalytic structures of DNA polymerase alpha-primase.</title>
                    <journal_abbreviation>Biorxiv</journal_abbreviation>
                    <country>US</country>
                    <year>2023</year>
                    <external_references type="PUBMED">36993335</external_references>
                    <external_references type="DOI">doi:10.1101/2023.03.16.533013</external_references>
                    <external_references type="ISSN">2692-8205</external_references>
                </journal_citation>
            </secondary_citation>
        </citation_list>
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    <sample>
        <name>Polymerase alpha-primase</name>
        <supramolecule_list>
            <complex_supramolecule supramolecule_id="1">
                <name>Polymerase alpha-primase</name>
                <parent>0</parent>
                <macromolecule_list>
                    <macromolecule>
                        <macromolecule_id>1</macromolecule_id>
                    </macromolecule>
                    <macromolecule>
                        <macromolecule_id>2</macromolecule_id>
                    </macromolecule>
                    <macromolecule>
                        <macromolecule_id>3</macromolecule_id>
                    </macromolecule>
                    <macromolecule>
                        <macromolecule_id>4</macromolecule_id>
                    </macromolecule>
                </macromolecule_list>
                <details>Heterotetrameric protein complex</details>
                <molecular_weight>
                    <theoretical units="MDa">0.3</theoretical>
                </molecular_weight>
            </complex_supramolecule>
            <complex_supramolecule supramolecule_id="2">
                <name>Polymerase alpha</name>
                <parent>1</parent>
                <macromolecule_list>
                    <macromolecule>
                        <macromolecule_id>1</macromolecule_id>
                    </macromolecule>
                    <macromolecule>
                        <macromolecule_id>2</macromolecule_id>
                    </macromolecule>
                </macromolecule_list>
                <details>Heterodimer consisting of POLA1 and POLA2</details>
                <natural_source database="NCBI">
                    <organism ncbi="8355">Xenopus laevis</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.2</theoretical>
                </molecular_weight>
            </complex_supramolecule>
            <complex_supramolecule supramolecule_id="3">
                <name>Primase</name>
                <parent>1</parent>
                <macromolecule_list>
                    <macromolecule>
                        <macromolecule_id>3</macromolecule_id>
                    </macromolecule>
                    <macromolecule>
                        <macromolecule_id>4</macromolecule_id>
                    </macromolecule>
                </macromolecule_list>
                <details>Heterodimer consisting of PRIM1 and PRIM2</details>
                <natural_source database="NCBI">
                    <organism ncbi="8355">Xenopus laevis</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.1</theoretical>
                </molecular_weight>
            </complex_supramolecule>
        </supramolecule_list>
        <macromolecule_list>
            <protein_or_peptide macromolecule_id="1">
                <name>POLA1</name>
                <natural_source database="NCBI">
                    <organism ncbi="8355">Xenopus laevis</organism>
                </natural_source>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>SNAADGSQVFRFYWLDAYEDQYSQPGVVYLFGKVWIESADAYVSCCVSVKNIERTVYLLPRENRVQLSTGKDTGAPVSMMHVYQEFNEAVAEKYKIMKFKSKKVDKDYAFEIPDVPASSEYLEVRYSADSPQLPQDLKGETFSHVFGTNTSSLELFLLSRKIKGPSWLEIKSPQLSSQPMSWCKVEAVVTRPDQVSVVKDLAPPPVVVLSLSMKTVQNAKTHQNEIVAIAALVHHTFPLDKAPPQPPFQTHFCVLSKLNDCIFPYDYNEAVKQKNANIEIALTERTLLGFFLAKIHKIDPDVIVGHDIYGFDLEVLLQRINSCKVPFWSKIGRLRRSVMPKLGGRSGFAERNAACGRIICDIEISAKELIRCKSYHLSELVHQILKAERVVIPPENIRNAYNDSVHLLYMLENTWIDAKFILQIMCELNVLPLALQITNIAGNVMSRTLMGGRSERNEYLLLHAFTENNFIVPDKPVFKKMQQTTVEDNDDMGTDQNKNKSRKKAAYAGGLVLEPKVGFYDKFILLLDFNSLYPSIIQEYNICFTTVHREAPSTQKGEDQDEIPELPHSDLEMGILPREIRKLVERRRHVKQLMKQPDLNPDLYLQYDIRQKALKLTANSMYGCLGFSYSRFYAKPLAALVTHQGREILLHTKEMVQKMNLEVIYGDTDSIMINTNCNNLEEVFKLGNRVKSEINKSYKLLEIDIDGIFKSLLLLKKKKYAALTVEPTGDGKYVTKQELKGLDIVRRDWCELAKQAGNYVISQILSDQPRDSIVENIQKKLTEIGENVTNGTVPITQYEINKALTKDPQDYPDKKSLPHVHVALWINSQGGRKVKAGDTISYVICQDGSNLSASQRAYAQEQLQKQENLSIDTQYYLSQQVHPVVARICEPIDGIDSALIAMWLGLDPSQFRAHRHYQQDEENDALLGGPSQLTDEEKYRDCERFKFFCPKCGTENIYDNVFDGSGLQIEPGLKRCSKPECDASPLDYVIQVHNKLLLDIRRYIKKYYSGWLVCEEKTCQNRTRRLPLSFSRNGPICQACSKATLRSEYPEKALYTQLCFYRFIFDWDYALEKVVSEQERGHLKKKLFQESENQYKKLKSTVDQVLSRSGYSEVNLSKLFQTLNTIK</string>
                    <external_references type="UNIPROTKB">Q9DE46</external_references>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="2">
                <name>POLA2</name>
                <natural_source database="NCBI">
                    <organism ncbi="8355">Xenopus laevis</organism>
                </natural_source>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>SNAMSVSAKSIAEELKVFDVNFEDEEVPEKMVELCTVHRLKEEDMVNEWMAFSTTRNLPLTVGNLNLLEHEVLNKKSARPRPSLKKEKHCGNRDFNTIQELIEVETAEENLLDSYATPAKGSQKRNLSTPEHPQSKRILSINRSPHVLFSPTSFSPSATPSQKYGSRTNRGEVVTTYGELQGTTWNGGSGSNTNVELFTSLDEPLTKMYKFMFQKLMDIREVVSIKIEELGASLKDHFQIDEFTSVSLPAQETVTVLGQIGCDSNGKLNSKSVILEGDREHSAGMQVPVDLSELKDYSLFPGQVVIMEGTNSTGRRFVPTKLYEGVPLPFHQPSKEFEECPQQMVITACGPFTTSDTITYDALKDLIDIVNRDRPDICILLGPFLDAKHEQIENLQLTVTFEDVFKRCLKMIIEGTRPSGCHLVIVPSLRDVHHDPVYPQPPFSCFEPAKEDKERVHFVADPCTLSVNGVVIGMTSTDLLFHMGAEEISSSAGAPDRFSRILRHILTQRSYYPLYPPNEEINIDYEALYSYTPMPVTPDVFIVPSELRYFIKDVTGCICINPGRLTKGLVGGTYARFLVKSGAMGSEGKRSTCISAQVVRV</string>
                    <external_references type="UNIPROTKB">Q6DCZ1</external_references>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="3">
                <name>PRIM2</name>
                <natural_source database="NCBI">
                    <organism ncbi="8355">Xenopus laevis</organism>
                </natural_source>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MLFSRDRKYRHNTRLTGDRKGDLYPSSLQFYQHPPTENISLIEFETFAIERLKLLKAVENLGVSYVKNSEEYSKKLELELRKLKFPYRPLHEEISDDVYDLRRKDHISHFILRLAYCQSEDLRRWFIQQEMDLFKFRFGLLTKESVQEFLKLNDLQYVAISEDEKNMHKEDLMNSSFGLSLTKMEDTEFYKVPFQAALDLVRPRKVFLWRGFAFIPHKDIVSIVLNDFRAKLSKALALSARSLPVVQSDERLQPLLNHLSHSYIGQDFSSQSNTGKISLEQIDGFAAKSFPLCMRQLHKSLRENHHLRHGGRMQYGLFLKGIGLTLEQALQFWRLEFTKGKVDSEKFDKVYAYSIRHNYGKEGKRTDYTPYSCMKVILSNPPSQGDYHGCPFRHSDPELLKQKLQSFKVPSSGINQILELVKGMHYQLACQKYFELTHSVDDCGFSLNHPNQYFAESQKLLTGSREIKKEQTARDSPAVTASQLSSSSSSASIPKSQSSAPEMEDLEQIFSEY</string>
                    <external_references type="UNIPROTKB">A0A1L8G3G3</external_references>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="4">
                <name>PRIM1</name>
                <natural_source database="NCBI">
                    <organism ncbi="8355">Xenopus laevis</organism>
                </natural_source>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>GPHMDLSVYDPASLPDVLPLYYRRLFPFYQYFRWLNYGGVVKNYFQHREFSFTLKDDVYVRYQSFNNQSELEKEMQKMCPYKIDIGAVYSHRPSLHNTVKSGTFQAQEKELVFDIDMTDYDDVRRCCSSADICPKCWTLMTIAVRILDRALAEDFGFKHRLWVYSGRRGVHCWVCDDSARKLSQAERSAVAEYLSVVKGGEETIKKVQLPETIHPFIGKSLKMVERYFEKYALVDQDILENKQCWDKVIALVPEVARESLLREFSKARSSVERWDKLSSCLEATGKDFRRYSNIPKEIMLQFCYPRLDVNVSKGLNHLLKSPFSVHPKTGRISVPIDCKKLDQFDPFSVPTISLICSELDNVSKKEEDEDSAGEGEPEAKKRTRDYKRTSLAPYIKVFEQFLDKLDQSRKGELLNKSDLKKEF</string>
                    <external_references type="UNIPROTKB">Q800A4</external_references>
                </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>
                    </vitrification>
                </single_particle_preparation>
            </specimen_preparation_list>
            <microscopy_list>
                <single_particle_microscopy microscopy_id="1">
                    <microscope>FEI TITAN KRIOS</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">2.7</nominal_cs>
                    <nominal_defocus_min units="µm">0.8</nominal_defocus_min>
                    <nominal_defocus_max units="µm">2.0</nominal_defocus_max>
                    <nominal_magnification>105000.0</nominal_magnification>
                    <image_recording_list>
                        <image_recording image_recording_id="1">
                            <film_or_detector_model>GATAN K3 BIOQUANTUM (6k x 4k)</film_or_detector_model>
                            <number_grids_imaged>1</number_grids_imaged>
                            <number_real_images>17820</number_real_images>
                            <average_electron_dose_per_image units="e/Å^2">54.8</average_electron_dose_per_image>
                        </image_recording>
                    </image_recording_list>
                </single_particle_microscopy>
            </microscopy_list>
            <singleparticle_processing image_processing_id="1">
                <image_recording_id>1</image_recording_id>
                <particle_selection>
                    <number_selected>23007566</number_selected>
                </particle_selection>
                <startup_model type_of_model="INSILICO MODEL">
                    <insilico_model>Ab initio reconstruction</insilico_model>
                </startup_model>
                <final_reconstruction>
                    <applied_symmetry>
                        <point_group>C1</point_group>
                    </applied_symmetry>
                    <resolution units="Å" res_type="BY AUTHOR">4.2</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
                    <software_list>
                        <software>
                            <name>cryoSPARC</name>
                        </software>
                    </software_list>
                    <number_images_used>80155</number_images_used>
                </final_reconstruction>
                <initial_angle_assignment>
                    <type>MAXIMUM LIKELIHOOD</type>
                    <software_list>
                        <software>
                            <name>cryoSPARC</name>
                        </software>
                    </software_list>
                </initial_angle_assignment>
                <final_angle_assignment>
                    <type>MAXIMUM LIKELIHOOD</type>
                    <software_list>
                        <software>
                            <name>cryoSPARC</name>
                        </software>
                    </software_list>
                </final_angle_assignment>
            </singleparticle_processing>
        </structure_determination>
    </structure_determination_list>
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            <y>200</y>
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        <cell>
            <a units="Å">328.0</a>
            <b units="Å">328.0</b>
            <c units="Å">328.0</c>
            <alpha units="deg">90.0</alpha>
            <beta units="deg">90.0</beta>
            <gamma units="deg">90.0</gamma>
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        <axis_order>
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            <minimum>-0.78159064</minimum>
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                <level>0.4</level>
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        <label>::::EMDATABANK.org::::EMD-29889::::</label>
        <annotation_details>Tetramer core subcomplex (conformation 2) of Xenopus laevis DNA polymerase alpha-primase</annotation_details>
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        <modelling_list>
            <modelling>
                <initial_model>
                    <access_code>8G9F</access_code>
                    <chain>
                        <source_name>PDB</source_name>
                        <initial_model_type>experimental model</initial_model_type>
                    </chain>
                </initial_model>
                <refinement_protocol>RIGID BODY FIT</refinement_protocol>
                <refinement_space>REAL</refinement_space>
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        <half_map_list>
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                <dimensions>
                    <col>200</col>
                    <row>200</row>
                    <sec>200</sec>
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                    <row>0</row>
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                    <y>200</y>
                    <z>200</z>
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                    <b units="Å">328.0</b>
                    <c units="Å">328.0</c>
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                    <beta units="deg">90.0</beta>
                    <gamma units="deg">90.0</gamma>
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                    <maximum>3.442522</maximum>
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                    <y units="Å">1.64</y>
                    <z units="Å">1.64</z>
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                <annotation_details>Tetramer core subcomplex (conformation 2) of Xenopus laevis DNA polymerase alpha-primase (half 2)</annotation_details>
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                    <b units="Å">328.0</b>
                    <c units="Å">328.0</c>
                    <alpha units="deg">90.0</alpha>
                    <beta units="deg">90.0</beta>
                    <gamma units="deg">90.0</gamma>
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                    <medium>Y</medium>
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                    <y units="Å">1.64</y>
                    <z units="Å">1.64</z>
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                <label>::::EMDATABANK.org::::EMD-29889::::</label>
                <annotation_details>Tetramer core subcomplex (conformation 2) of Xenopus laevis DNA polymerase alpha-primase (half 1)</annotation_details>
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    </interpretation>
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