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        <sites>
            <deposition>PDBe</deposition>
            <last_processing>PDBe</last_processing>
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        <key_dates>
            <deposition>2017-01-31</deposition>
            <header_release>2017-02-15</header_release>
            <map_release>2017-03-08</map_release>
            <update>2025-07-09</update>
        </key_dates>
        <title>Cryo-EM structure of a Separase-Securin complex from Caenorhabditis elegans at 3.8 A resolution</title>
        <authors_list>
            <author>Boland A</author>
            <author>Martin TG</author>
        </authors_list>
        <keywords>caspase, cell cycle, cohesin, cleavage</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author order="1">Boland A</author>
                    <author order="2">Martin TG</author>
                    <author order="3">Zhang Z</author>
                    <author order="4">Yang J</author>
                    <author order="5">Bai XC</author>
                    <author order="6">Chang L</author>
                    <author order="7">Scheres SH</author>
                    <author order="8">Barford D</author>
                    <title>Cryo-EM structure of a metazoan separase-securin complex at near-atomic resolution.</title>
                    <journal_abbreviation>Nat. Struct. Mol. Biol.</journal_abbreviation>
                    <country>US</country>
                    <volume>24</volume>
                    <first_page>414</first_page>
                    <last_page>418</last_page>
                    <year>2017</year>
                    <external_references type="PUBMED">28263324</external_references>
                    <external_references type="DOI">doi:10.1038/nsmb.3386</external_references>
                    <external_references type="ISSN">1545-9985</external_references>
                </journal_citation>
            </primary_citation>
        </citation_list>
        <pdb_list>
            <pdb_reference>
                <pdb_id>5mz6</pdb_id>
                <relationship>
                    <in_frame>FULLOVERLAP</in_frame>
                </relationship>
            </pdb_reference>
        </pdb_list>
    </crossreferences>
    <sample>
        <name>Caenorhabditis elegans Separase-Securin complex</name>
        <supramolecule_list>
            <complex_supramolecule supramolecule_id="1">
                <name>Caenorhabditis elegans Separase-Securin complex</name>
                <parent>0</parent>
                <macromolecule_list>
                    <macromolecule>
                        <macromolecule_id>1</macromolecule_id>
                    </macromolecule>
                    <macromolecule>
                        <macromolecule_id>2</macromolecule_id>
                    </macromolecule>
                </macromolecule_list>
                <details>C. elegans Separase-Securin complex at 3.8 Angstrom resolution refined with Relion.</details>
                <natural_source database="NCBI">
                    <organism ncbi="6239">Caenorhabditis elegans</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.17</theoretical>
                </molecular_weight>
            </complex_supramolecule>
        </supramolecule_list>
        <macromolecule_list>
            <protein_or_peptide macromolecule_id="1">
                <name>SEParase</name>
                <natural_source database="NCBI">
                    <organism ncbi="6239">Caenorhabditis elegans</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.14431598399999998</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="7111">Trichoplusia ni</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MKITNKSVDKQHIEKLDELRKNVSCTVIGFAEQTAELQQEISELFIAEFGVNGPIDMNSLSKLARITSYYASSEYFQGLA
KYQRTACKMFITWQTLRKEAMECRSKDREIFASIPAKLCFFYFYNGELCRAVVCLLDYIDLSDDTLAKEAALRWLMFLGE
TELIEKKLKTWKMDKSSKDMFSATEFAMNYLKKSEYRVEMLEKLMKLRDKVKSDPTRSFSRYELASYVSWLCSTLSNVPV
GSALRECEFPDRVSHIQEAALKSDSLVRNRIPGLASSQFDNSVNASIWPFLDGHQEDSNYYVHIGSTIAWHFEMRRECAL
VNVTTAQTRDSMSAMILNLRVALKSASFFRVLQTTNTLAYYSSIIEEAGSEKNAKLMRVSCVNLLSSNPIIVRCSTPKET
GATSRAHTPMAGSSVSEKQNTMRPDLADLLGDLELLDEQSFHPITRSCVCNVCTIYPLHSSFAAEYMMSYAIHSDFSQLS
IKHFNDEFARIRERGMSSQVLMHRDSSVRPRPNIIQNEIFGMCVIRWLTKKLDSKESADEDTMEIFNNALKIVRYLQQRT
TDMILAVTQLGRQLEFPMECNYSWMRPTIRKPRVKATIDCAVDILRAVSPFGRRPKVEKLEKNLQPFDKERFEKVRLAMR
NEMNHYGHILYREWRCRLFAYVGRTSRDPWEAAYAWAESTQIGARNAVQSRLEKCKRGLVTMSGHDRFKTCVQSMPDEMT
LVQIAMADDKTIYLVKLHADRDPIIMPLAHYSQAVELMDKFTFLLDEDEMIAKYPGDITPEEFWKRRKIVDGRMMTFVDE
VQKHFLGVAASLLMPSGQLGPKAAELAIKIHKLSKGGLLLGEAKEMVYQSKLMDAKSWEALILRFCEMRTTDEKFKSFLP
LMHRNSVEVMNQDDSIVTEKKYTYLVICPHLSQFCWERLPIFDEYPYVGRQVSIHSTFSQLEAMKSQEKQIPLQIDVQNA
YYILDPDNNLGETQKRMVEYINKFNWEGTVGSAPKSNEISAALSQRDAFFFIGHGSGSSVMPRSVLKQSTCNAISLLMGC
GSVRTIPQALGFDGKTAILDYAMAKCPLIVGCLWTVTDGEIDRFLIRMIDDCFEDSKSLTGIDKLRQLSEAMHEARSKAR
LKYLTGAAVVMYGLPVVAKQTTPFVEKDQRNLPQTPKTSARTSMRMETVPKTPKQEFVTSKSVPMTPIFSNNENKSPSRA
RMPSRVLKTPRQVKTFQEEDDEAPKRSTTRQLKPLVAPPIPATPTTRTTRSSARTPSRSRNL</string>
                    <external_references type="UNIPROTKB">G5ED39</external_references>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="2">
                <name>Interactor of FizzY protein</name>
                <natural_source database="NCBI">
                    <organism ncbi="6239">Caenorhabditis elegans</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.027027646</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="7111">Trichoplusia ni</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MEDLNFEERGSTQIPASLQQHFSAKLGRQNELEKTPSRGGLGLVVNSSKTPGGKSLQSLASACKVPPSTKKNTIPIAFEC
YEDETDDQIADVATIKKTEKHPCSPIDTANRCETFDSLAADIEDDMLNLEDQDVVLSEDRPYGDVIDPAESEAEALAELG
VEEWDSYPPIDPASRIGDDFNYVLRTEDFAEEGDVKLEETRHRTVIADIDEVKMSKAERNELFSMLADDLDSYDLLAEEA
NLPL</string>
                    <external_references type="UNIPROTKB">Q18235</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">0.02</concentration>
                    <buffer>
                        <ph>7.8</ph>
                    </buffer>
                    <grid>
                        <model>Quantifoil R1.2/1.3</model>
                        <material>GOLD</material>
                        <mesh>300</mesh>
                        <support_film film_type_id="1">
                            <film_material>GRAPHENE OXIDE</film_material>
                            <film_topology>HOLEY ARRAY</film_topology>
                        </support_film>
                        <pretreatment>
                            <type>GLOW DISCHARGE</type>
                            <time units="s">60</time>
                            <atmosphere>AIR</atmosphere>
                        </pretreatment>
                        <details>Glow discharging was performed before applying graphene oxide solution onto the grid. 
Grid was washed three times, dried and sample was applied.

For detailed information see:
https://figshare.com/articles/Graphene_Oxide_Grid_Preparation/3178669</details>
                    </grid>
                    <vitrification>
                        <cryogen_name>ETHANE</cryogen_name>
                        <chamber_humidity units="percentage">100</chamber_humidity>
                        <chamber_temperature units="K">277</chamber_temperature>
                        <details>Custom Manual Plunger. </details>
                    </vitrification>
                    <details>Monodisperse sample</details>
                </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>
                    <c2_aperture_diameter units="µm">70.0</c2_aperture_diameter>
                    <nominal_cs units="mm">2.7</nominal_cs>
                    <specimen_holder_model>FEI TITAN KRIOS AUTOGRID HOLDER</specimen_holder_model>
                    <cooling_holder_cryogen>NITROGEN</cooling_holder_cryogen>
                    <alignment_procedure>
                        <coma_free/>
                    </alignment_procedure>
                    <specialist_optics>
                        <energy_filter>
                            <name>GIF</name>
                            <lower_energy_threshold units="eV">-20</lower_energy_threshold>
                            <upper_energy_threshold units="eV">20</upper_energy_threshold>
                        </energy_filter>
                    </specialist_optics>
                    <image_recording_list>
                        <image_recording image_recording_id="1">
                            <film_or_detector_model>GATAN K2 SUMMIT (4k x 4k)</film_or_detector_model>
                            <detector_mode>SUPER-RESOLUTION</detector_mode>
                            <digitization_details>
                                <dimensions>
                                    <width units="pixel">3710</width>
                                    <height units="pixel">3710</height>
                                </dimensions>
                            </digitization_details>
                            <average_exposure_time units="s">0.8</average_exposure_time>
                            <average_electron_dose_per_image units="e/Å^2">1.25</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>
                <ctf_correction>
                    <software_list>
                        <software>
                            <name>Gctf</name>
                        </software>
                    </software_list>
                    <type>PHASE FLIPPING AND AMPLITUDE CORRECTION</type>
                </ctf_correction>
                <startup_model type_of_model="NONE">
                    <details>Initial model was created using SIMPLE PRIME</details>
                </startup_model>
                <final_reconstruction>
                    <applied_symmetry>
                        <point_group>C1</point_group>
                    </applied_symmetry>
                    <resolution units="Å" res_type="BY AUTHOR">3.8</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
                    <software_list>
                        <software>
                            <name>RELION</name>
                            <version>2.0</version>
                        </software>
                    </software_list>
                    <number_images_used>103696</number_images_used>
                </final_reconstruction>
                <initial_angle_assignment>
                    <type>ANGULAR RECONSTITUTION</type>
                    <software_list>
                        <software>
                            <name>RELION</name>
                            <version>2.0</version>
                        </software>
                    </software_list>
                </initial_angle_assignment>
                <final_angle_assignment>
                    <type>ANGULAR RECONSTITUTION</type>
                    <software_list>
                        <software>
                            <name>RELION</name>
                            <version>2.0</version>
                        </software>
                    </software_list>
                </final_angle_assignment>
            </singleparticle_processing>
        </structure_determination>
    </structure_determination_list>
    <map format="CCP4" size_kbytes="23329">
        <file>emd_3583.map.gz</file>
        <symmetry>
            <space_group>1</space_group>
        </symmetry>
        <data_type>IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)</data_type>
        <dimensions>
            <col>180</col>
            <row>180</row>
            <sec>180</sec>
        </dimensions>
        <origin>
            <col>0</col>
            <row>0</row>
            <sec>0</sec>
        </origin>
        <spacing>
            <x>180</x>
            <y>180</y>
            <z>180</z>
        </spacing>
        <cell>
            <a units="Å">257.4</a>
            <b units="Å">257.4</b>
            <c units="Å">257.4</c>
            <alpha units="deg">90.0</alpha>
            <beta units="deg">90.0</beta>
            <gamma units="deg">90.0</gamma>
        </cell>
        <axis_order>
            <fast>X</fast>
            <medium>Y</medium>
            <slow>Z</slow>
        </axis_order>
        <statistics>
            <minimum>-0.29977334</minimum>
            <maximum>0.39163244</maximum>
            <average>0.00042302595</average>
            <std>0.009249026</std>
        </statistics>
        <pixel_spacing>
            <x units="Å">1.43</x>
            <y units="Å">1.43</y>
            <z units="Å">1.43</z>
        </pixel_spacing>
        <contour_list>
            <contour primary="true">
                <level>0.1</level>
                <source>AUTHOR</source>
            </contour>
        </contour_list>
        <label>::::EMDATABANK.org::::EMD-3583::::</label>
        <annotation_details>Map of the C. elegans Separase-Securin complex. Manual B-factor sharpening of 140 applied.</annotation_details>
    </map>
    <interpretation>
        <modelling_list>
            <modelling>
                <refinement_protocol>AB INITIO MODEL</refinement_protocol>
                <refinement_space>REAL</refinement_space>
            </modelling>
        </modelling_list>
    </interpretation>
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