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    <admin>
        <current_status>
            <date>2024-11-20</date>
            <code>REL</code>
            <processing_site>RCSB</processing_site>
        </current_status>
        <sites>
            <deposition>RCSB</deposition>
            <last_processing>RCSB</last_processing>
        </sites>
        <key_dates>
            <deposition>2021-09-28</deposition>
            <header_release>2022-09-28</header_release>
            <map_release>2022-09-28</map_release>
            <update>2024-11-20</update>
        </key_dates>
        <grant_support>
            <grant_reference>
                <funding_body>National Institutes of Health/National Cancer Institute (NIH/NCI)</funding_body>
                <code>CA231466</code>
                <country>United States</country>
            </grant_reference>
        </grant_support>
        <title>Cryo-EM 3D map of the human Exostosin-1 and Exostosin-2 heterodimer</title>
        <authors_list>
            <author>Li H</author>
            <author>Li H</author>
        </authors_list>
        <keywords>exostosin1, exostosin2, glycosyltransferase, heparan sulfate, TRANSFERASE</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author order="1">Li H</author>
                    <author order="2">Chapla D</author>
                    <author order="3">Amos RA</author>
                    <author order="4">Ramiah A</author>
                    <author order="5">Moremen KW</author>
                    <author order="6">Li H</author>
                    <title>Structural basis for heparan sulfate co-polymerase action by the EXT1-2 complex.</title>
                    <journal_abbreviation>Nat.Chem.Biol.</journal_abbreviation>
                    <country>US</country>
                    <volume>19</volume>
                    <first_page>565</first_page>
                    <last_page>574</last_page>
                    <year>2023</year>
                    <external_references type="PUBMED">36593275</external_references>
                    <external_references type="DOI">doi:10.1038/s41589-022-01220-2</external_references>
                    <external_references type="ISSN">1552-4469</external_references>
                </journal_citation>
            </primary_citation>
        </citation_list>
        <pdb_list>
            <pdb_reference>
                <pdb_id>7sch</pdb_id>
                <relationship>
                    <in_frame>FULLOVERLAP</in_frame>
                </relationship>
            </pdb_reference>
        </pdb_list>
    </crossreferences>
    <sample>
        <name>hEXT1/2</name>
        <supramolecule_list>
            <complex_supramolecule supramolecule_id="1">
                <name>hEXT1/2</name>
                <parent>0</parent>
                <macromolecule_list>
                    <macromolecule>
                        <macromolecule_id>1</macromolecule_id>
                    </macromolecule>
                    <macromolecule>
                        <macromolecule_id>2</macromolecule_id>
                    </macromolecule>
                </macromolecule_list>
                <natural_source database="NCBI">
                    <organism ncbi="9606">Homo sapiens</organism>
                </natural_source>
            </complex_supramolecule>
        </supramolecule_list>
        <macromolecule_list>
            <protein_or_peptide macromolecule_id="1">
                <name>Exostosin-1</name>
                <natural_source database="NCBI">
                    <organism ncbi="9606">Homo sapiens</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.083404023</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="40674">Mammalia</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>GFRASRSHSRREEHSGRNGLHHPSPDHFWPRFPDALRPFVPWDQLENEDSSVHISPRQKRDANSSIYKGKKCRMESCFDF
TLCKKNGFKVYVYPQQKGEKIAESYQNILAAIEGSRFYTSDPSQACLFVLSLDTLDRDQLSPQYVHNLRSKVQSLHLWNN
GRNHLIFNLYSGTWPDYTEDVGFDIGQAMLAKASISTENFRPNFDVSIPLFSKDHPRTGGERGFLKFNTIPPLRKYMLVF
KGKRYLTGIGSDTRNALYHVHNGEDVVLLTTCKHGKDWQKHKDSRCDRDNTEYEKYDYREMLHNATFCLVPRGRRLGSFR
FLEALQAACVPVMLSNGWELPFSEVINWNQAAVIGDERLLLQIPSTIRSIHQDKILALRQQTQFLWEAYFSSVEKIVLTT
LEIIQDRIFKHISRNSLIWNKHPGGLFVLPQYSSYLGDFPYYYANLGLKPPSKFTAVIHAVTPLVSQSQPVLKLLVAAAK
SQYCAQIIVLWNCDKPLPAKHRWPATAVPVVVIEGESKVMSSRFLPYDNIITDAVLSLDEDTVLSTTEVDFAFTVWQSFP
ERIVGYPARSHFWDNSKERWGYTSKWTNDYSMVLTGAAIYHKYYHYLYSHYLPASLKNMVDQLANCEDILMNFLVSAVTK
LPPIKVTQKKQYKETMMGQTSRASRWADPDHFAQRQSCMNTFASWFGYMPLIHSQMRLDPVLFKDQVSILRKKYRDIERL</string>
                    <external_references type="UNIPROTKB">Q16394</external_references>
                </sequence>
                <ec_number>2.4.1.224</ec_number>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="2">
                <name>Exostosin-2</name>
                <natural_source database="NCBI">
                    <organism ncbi="9606">Homo sapiens</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.077238031</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="40674">Mammalia</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>GWPHSIESSNDWNVEKRSIRDVPVVRLPADSPIPERGDLSCRMHTCFDVYRCGFNPKNKIKVYIYALKKYVDDFGVSVSN
TISREYNELLMAISDSDYYTDDINRACLFVPSIDVLNQNTLRIKETAQAMAQLSRWDRGTNHLLFNMLPGGPPDYNTALD
VPRDRALLAGGGFSTWTYRQGYDVSIPVYSPLSAEVDLPEKGPGPRQYFLLSSQVGLHPEYREDLEALQVKHGESVLVLD
KCTNLSEGVLSVRKRCHKHQVFDYPQVLQEATFCVVLRGARLGQAVLSDVLQAGCVPVVIADSYILPFSEVLDWKRASVV
VPEEKMSDVYSILQSIPQRQIEEMQRQARWFWEAYFQSIKAIALATLQIINDRIYPYAAISYEEWNDPPAVKWGSVSNPL
FLPLIPPQSQGFTAIVLTYDRVESLFRVITEVSKVPSLSKLLVVWNNQNKNPPEDSLWPKIRVPLKVVRTAENKLSNRFF
PYDEIETEAVLAIDDDIIMLTSDELQFGYEVWREFPDRLVGYPGRLHLWDHEMNKWKYESEWTNEVSMVLTGAAFYHKYF
NYLYTYKMPGDIKNWVDAHMNCEDIAMNFLVANVTGKAVIKVTPRKKFKCPECTAIDGLSLDQTHMVERSECINKFASVF
GTMPLKVVEHRADPVLYKDDFPEKLKSFPNIGSL</string>
                    <external_references type="UNIPROTKB">Q93063</external_references>
                </sequence>
                <ec_number>2.4.1.224</ec_number>
            </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">0.3</concentration>
                    <buffer>
                        <ph>7.0</ph>
                        <component>
                            <concentration units="mM">150.0</concentration>
                            <formula>NaCl</formula>
                            <name>sodium chloride</name>
                        </component>
                        <component>
                            <concentration units="mM">20.0</concentration>
                            <formula>HEPES</formula>
                            <name>HEPES</name>
                        </component>
                    </buffer>
                    <grid>
                        <model>Quantifoil R2/1</model>
                        <material>GOLD</material>
                        <mesh>300</mesh>
                        <support_film film_type_id="1">
                            <film_material>CARBON</film_material>
                            <film_topology>HOLEY</film_topology>
                        </support_film>
                    </grid>
                    <vitrification>
                        <cryogen_name>ETHANE</cryogen_name>
                        <chamber_humidity units="percentage">95</chamber_humidity>
                        <chamber_temperature units="K">299</chamber_temperature>
                        <instrument>FEI VITROBOT MARK IV</instrument>
                    </vitrification>
                </single_particle_preparation>
            </specimen_preparation_list>
            <microscopy_list>
                <single_particle_microscopy microscopy_id="1">
                    <microscope>FEI TITAN KRIOS</microscope>
                    <illumination_mode>OTHER</illumination_mode>
                    <imaging_mode>BRIGHT FIELD</imaging_mode>
                    <electron_source>FIELD EMISSION GUN</electron_source>
                    <acceleration_voltage units="kV">300</acceleration_voltage>
                    <c2_aperture_diameter units="µm">70.0</c2_aperture_diameter>
                    <nominal_cs units="mm">2.7</nominal_cs>
                    <nominal_magnification>105000.0</nominal_magnification>
                    <specimen_holder_model>FEI TITAN KRIOS AUTOGRID HOLDER</specimen_holder_model>
                    <cooling_holder_cryogen>NITROGEN</cooling_holder_cryogen>
                    <temperature>
                        <temperature_min units="K">193.0</temperature_min>
                        <temperature_max units="K">193.0</temperature_max>
                    </temperature>
                    <alignment_procedure>
                        <coma_free>
                            <residual_tilt units="mrad">0.05</residual_tilt>
                        </coma_free>
                    </alignment_procedure>
                    <image_recording_list>
                        <image_recording image_recording_id="1">
                            <film_or_detector_model>GATAN K3 (6k x 4k)</film_or_detector_model>
                            <digitization_details>
                                <dimensions>
                                    <width units="pixel">5760</width>
                                    <height units="pixel">4092</height>
                                </dimensions>
                            </digitization_details>
                            <number_grids_imaged>1</number_grids_imaged>
                            <number_real_images>2980</number_real_images>
                            <average_exposure_time units="s">1.5</average_exposure_time>
                            <average_electron_dose_per_image units="e/Å^2">66.8</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>5186047</number_selected>
                </particle_selection>
                <startup_model type_of_model="NONE"/>
                <final_reconstruction>
                    <applied_symmetry>
                        <point_group>C1</point_group>
                    </applied_symmetry>
                    <resolution units="Å" res_type="BY AUTHOR">3.1</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
                    <software_list>
                        <software>
                            <name>RELION</name>
                            <version>3.1</version>
                        </software>
                    </software_list>
                    <number_images_used>120216</number_images_used>
                </final_reconstruction>
                <initial_angle_assignment>
                    <type>ANGULAR RECONSTITUTION</type>
                </initial_angle_assignment>
                <final_angle_assignment>
                    <type>ANGULAR RECONSTITUTION</type>
                </final_angle_assignment>
            </singleparticle_processing>
        </structure_determination>
    </structure_determination_list>
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        <file>emd_25035.map.gz</file>
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            <space_group>1</space_group>
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        <modelling_list>
            <modelling>
                <refinement_protocol>AB INITIO MODEL</refinement_protocol>
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        <segmentation_list>
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                <file>emd_25035_msk_1.map</file>
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