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            <date>2025-05-21</date>
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                            <category>em_software</category>
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        <sites>
            <deposition>RCSB</deposition>
            <last_processing>RCSB</last_processing>
        </sites>
        <key_dates>
            <deposition>2024-02-13</deposition>
            <header_release>2024-10-30</header_release>
            <map_release>2024-10-30</map_release>
            <update>2025-05-21</update>
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        <grant_support>
            <grant_reference>
                <funding_body>National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)</funding_body>
                <code>GM105691</code>
                <country>United States</country>
            </grant_reference>
        </grant_support>
        <title>BsaXI -- Type IIB R-M system</title>
        <authors_list>
            <author>Shen BW</author>
            <author>Stoddard BL</author>
        </authors_list>
        <keywords>R-M system, restriction nucleases, Type IIB, protein-DNA complex, BsaXI., ANTIMICROBIAL PROTEIN</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="false">
                    <author ORCID="0000-0002-8861-5119" order="1">Shen BW</author>
                    <author ORCID="0000-0003-2250-9601" order="2">Stoddard BL</author>
                    <title>Atomic insights into the mechanism of DNA recognition and methylation by type IIB restriction-modification system: CryoEM structures of DNA free and cognate DNA bound BsaXI.</title>
                    <journal_abbreviation>To Be Published</journal_abbreviation>
                    <external_references type="CSD">0353</external_references>
                </journal_citation>
            </primary_citation>
        </citation_list>
        <pdb_list>
            <pdb_reference>
                <pdb_id>8w0p</pdb_id>
                <relationship>
                    <in_frame>FULLOVERLAP</in_frame>
                </relationship>
            </pdb_reference>
        </pdb_list>
    </crossreferences>
    <sample>
        <name>heterotrimers of RM fusion and S subunit</name>
        <supramolecule_list>
            <complex_supramolecule supramolecule_id="1">
                <name>heterotrimers of RM fusion and S subunit</name>
                <parent>0</parent>
                <macromolecule_list>
                    <macromolecule>
                        <macromolecule_id>1</macromolecule_id>
                    </macromolecule>
                    <macromolecule>
                        <macromolecule_id>2</macromolecule_id>
                    </macromolecule>
                </macromolecule_list>
                <details>reconstituted RM and S subunits of type IIB
R-M systems.</details>
                <natural_source database="NCBI">
                    <organism ncbi="1422">Geobacillus stearothermophilus</organism>
                    <strain>Cpw230</strain>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.59</theoretical>
                </molecular_weight>
            </complex_supramolecule>
        </supramolecule_list>
        <macromolecule_list>
            <protein_or_peptide macromolecule_id="1">
                <name>RM.BsaXI</name>
                <natural_source database="NCBI">
                    <organism ncbi="1422">Geobacillus stearothermophilus</organism>
                    <strain>Cpw230</strain>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.10719523399999999</theoretical>
                </molecular_weight>
                <details>RM fusion protein</details>
                <number_of_copies>2</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="562">Escherichia coli</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MKNWQRIVEAKLEQQKHKVAEISLENGTVNYSKKIKHNRNLKALTGDEEIVRAFLIDRLVNELDYKPEYLETEKEYTIKG
GHSKINPRVDVLVKDDKGNPFFFIEVKAPNKFEEDKDEIEGQLFALAQAEERDFKTKVKYLVYYTVELIDDEIVDRAIII
DFEKYPTYTDWSNGGFISTGTELTAGYGEPKKQPLIKGHEKYDLRVRIDREEIEGLGRNLHNVLWGGGGTNDSEIFYSLV
NIILAKIQDEYEKEDGQEYDFQVYQYGDNVESPQKLFDRINALYKRALREQLNVTDEQKIAEDNVINRNKFPLNKLVYTV
QALESLSFLEGRNSLDGKDILGDFFESIIRDGFKQTKGQFFTPTPIVKFILYALQLDKLAIDRLNNDRELPLIIDPSAGS
GTFLIEAMKLITKEVKYKQNHKVKSSRQITKRFEELFMPDHNENKWAREYLYGCEINFDLGTASKVNMILHGDGSANIFV
QDGLLPFRFYVKETSPNYLETASPDALYGDKEVNGKFDVVVSNPPFSVDLDTQTQREVRNAFLFGDKKNSENLFIERYYQ
LLKEGGRLGVVLPESVFDTTENKYIRLFIFKYFKVKAVVSLPQVTFEPFTSTKTSLLFAQKKTKEEVEQWNELWDKYGKE
WSLLKTRINDYFSYFVKGRPLNKKWAPDVVKDIQEGNEDNIRKNIFRFLKDHIKEEDKNLEIKDLLIKYAEEISSISKHE
KETDVFGFYNAWWVFGEVAKELDYPIFMAEAENVGYKRTKKGEKPMPNDLYDLEYAPSTLDCEKVLSSFDIEINALEASK
TKLSVEKGLLEEKLKDKEDKENEKIQKRLNKISELLETIENQLDSIRSKKLEVEGILEKYYENNKLKEEYSERDDEELIN
HFKHGVLYQYRSEDILLRNKTVHKILDEIRQGVIWD</string>
                    <external_references type="UNIPROTKB">A0A4D7QEP1</external_references>
                </sequence>
                <ec_number>2.1.1.72</ec_number>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="2">
                <name>S.BsaXI</name>
                <natural_source database="NCBI">
                    <organism ncbi="1422">Geobacillus stearothermophilus</organism>
                    <strain>Cpw230</strain>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.055038824</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="562">Escherichia coli</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MGLIQRRNFSTFASEPSVRFDFNYMKSVTPTTEEYYTYKSLFEVVPSTVPTLDESEPFKYAEIGHVSKNGEVFPVTLSFE
DRDELNEDLFKKIEKGDIFLPERGNILISAIRPYLNKIVLIKEDDKTDIYFTKAFIQIKPLINSRILYYALRTIFSEKIN
AVSRQGKGYPTLKEDDLKTIQFSKKVIDNLLAKEEELISNIDALEKDIKELKSIQRSKKEIVDEVFSSHFNINMVELMAL
DSQRRVDVGLSSISSLNSTIRYSYRWNKMKLIQKYLYRDIDCIEPLGKYILSSNNGWSPESVVGGEGIPILGQEHLEFDG
VLNVSPTKATTKTKNNMENFFIQEGDLFISRGNTVDLVGLACVVETEVTEDIIYPDLYIRLKIDEKVIHKKYLALLFNSF
FGRLYFKYVSKGKNQTMVKISSNELLNYYLPIPPMEEQLEIVGKIEEQIGAQNEIEKQIEEKRNQIRVIIEETARS</string>
                    <external_references type="UNIPROTKB">A0A226QBA7</external_references>
                </sequence>
            </protein_or_peptide>
            <ligand macromolecule_id="3">
                <name>S-ADENOSYLMETHIONINE</name>
                <molecular_weight>
                    <theoretical units="MDa">0.000398437</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <formula>SAM</formula>
            </ligand>
        </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">0.35</concentration>
                    <buffer>
                        <ph>8.0</ph>
                        <details>20 mM TrisHCl, ph 8.0, 2 mM CaCl2, 150 mM NaCl</details>
                    </buffer>
                    <grid>
                        <model>Quantifoil R1.2/1.3</model>
                        <material>COPPER</material>
                        <mesh>300</mesh>
                        <support_film film_type_id="1">
                            <film_material>CARBON</film_material>
                            <film_topology>HOLEY</film_topology>
                        </support_film>
                        <pretreatment>
                            <type>GLOW DISCHARGE</type>
                            <time units="s">30</time>
                            <atmosphere>AIR</atmosphere>
                        </pretreatment>
                    </grid>
                    <vitrification>
                        <cryogen_name>ETHANE</cryogen_name>
                        <chamber_humidity units="percentage">95</chamber_humidity>
                        <chamber_temperature units="K">298</chamber_temperature>
                        <instrument>FEI VITROBOT MARK IV</instrument>
                    </vitrification>
                    <details>Monodisperse</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>
                    <nominal_defocus_min units="µm">1.2</nominal_defocus_min>
                    <nominal_defocus_max units="µm">5.0</nominal_defocus_max>
                    <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>COUNTING</detector_mode>
                            <digitization_details>
                                <frames_per_image>2-50</frames_per_image>
                            </digitization_details>
                            <number_grids_imaged>1</number_grids_imaged>
                            <number_real_images>6227</number_real_images>
                            <average_exposure_time units="s">2.0</average_exposure_time>
                            <average_electron_dose_per_image units="e/Å^2">40.0</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>2487316</number_selected>
                </particle_selection>
                <ctf_correction>
                    <software_list>
                        <software>
                            <name>cryoSPARC</name>
                            <version>3.32</version>
                        </software>
                    </software_list>
                    <type>PHASE FLIPPING AND AMPLITUDE CORRECTION</type>
                </ctf_correction>
                <startup_model type_of_model="INSILICO MODEL">
                    <insilico_model>The alpha carbon trace of a phyr2 structure prediction for the methyl transferase domain was ducked into the refined map and was used as reference for manual building of the RM model, including the alpha carbon of the Knocker and Paddle domains.</insilico_model>
                </startup_model>
                <final_reconstruction>
                    <applied_symmetry>
                        <point_group>C1</point_group>
                    </applied_symmetry>
                    <algorithm>FOURIER SPACE</algorithm>
                    <resolution units="Å" res_type="BY AUTHOR">3.26</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
                    <software_list>
                        <software>
                            <name>cryoSPARC</name>
                            <version>3.32</version>
                        </software>
                    </software_list>
                    <number_images_used>194038</number_images_used>
                </final_reconstruction>
                <initial_angle_assignment>
                    <type>ANGULAR RECONSTITUTION</type>
                    <software_list>
                        <software>
                            <name>cryoSPARC</name>
                            <version>3.32</version>
                        </software>
                    </software_list>
                </initial_angle_assignment>
                <final_angle_assignment>
                    <type>ANGULAR RECONSTITUTION</type>
                    <software_list>
                        <software>
                            <name>cryoSPARC</name>
                            <version>3.32</version>
                        </software>
                    </software_list>
                </final_angle_assignment>
                <final_three_d_classification>
                    <number_classes>2</number_classes>
                    <software_list>
                        <software>
                            <name>cryoSPARC</name>
                            <version>3.32</version>
                        </software>
                    </software_list>
                </final_three_d_classification>
            </singleparticle_processing>
        </structure_determination>
    </structure_determination_list>
    <map format="CCP4" size_kbytes="226493">
        <file>emd_43711.map.gz</file>
        <symmetry>
            <space_group>1</space_group>
        </symmetry>
        <data_type>IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)</data_type>
        <dimensions>
            <col>384</col>
            <row>384</row>
            <sec>384</sec>
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        <spacing>
            <x>384</x>
            <y>384</y>
            <z>384</z>
        </spacing>
        <cell>
            <a units="Å">414.336</a>
            <b units="Å">414.336</b>
            <c units="Å">414.336</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>-0.36282444</minimum>
            <maximum>0.9502708</maximum>
            <average>0.00029064124</average>
            <std>0.017084736</std>
        </statistics>
        <pixel_spacing>
            <x units="Å">1.079</x>
            <y units="Å">1.079</y>
            <z units="Å">1.079</z>
        </pixel_spacing>
        <contour_list>
            <contour primary="true">
                <level>0.15</level>
                <source>AUTHOR</source>
            </contour>
        </contour_list>
        <label>::::EMDATABANK.org::::EMD-43711::::</label>
        <annotation_details>cryosparc2_P35_J607, app BsaXI</annotation_details>
    </map>
    <interpretation>
        <half_map_list>
            <half_map format="CCP4" size_kbytes="226493">
                <file>emd_43711_half_map_2.map.gz</file>
                <symmetry>
                    <space_group>1</space_group>
                </symmetry>
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                    <col>384</col>
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                <spacing>
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                    <y>384</y>
                    <z>384</z>
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                <cell>
                    <a units="Å">414.336</a>
                    <b units="Å">414.336</b>
                    <c units="Å">414.336</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>-0.62618816</minimum>
                    <maximum>1.1922152</maximum>
                    <average>0.00041282797</average>
                    <std>0.06762123</std>
                </statistics>
                <pixel_spacing>
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                    <y units="Å">1.079</y>
                    <z units="Å">1.079</z>
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                    <contour primary="true">
                        <source>AUTHOR</source>
                    </contour>
                </contour_list>
                <label>::::EMDATABANK.org::::EMD-43711::::</label>
                <annotation_details>apoBsaXI, half_map_A
CS_P35_607_A</annotation_details>
            </half_map>
            <half_map format="CCP4" size_kbytes="226493">
                <file>emd_43711_half_map_1.map.gz</file>
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                    <space_group>1</space_group>
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                    <beta units="deg">90.0</beta>
                    <gamma units="deg">90.0</gamma>
                </cell>
                <axis_order>
                    <fast>X</fast>
                    <medium>Y</medium>
                    <slow>Z</slow>
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                <statistics>
                    <minimum>-0.522725</minimum>
                    <maximum>1.1858647</maximum>
                    <average>0.00041356328</average>
                    <std>0.06778512</std>
                </statistics>
                <pixel_spacing>
                    <x units="Å">1.079</x>
                    <y units="Å">1.079</y>
                    <z units="Å">1.079</z>
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                    <contour primary="true">
                        <source>AUTHOR</source>
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                </contour_list>
                <label>::::EMDATABANK.org::::EMD-43711::::</label>
                <annotation_details>apoBsaXI; half_map_B
CS_P35_J607_B</annotation_details>
            </half_map>
        </half_map_list>
    </interpretation>
</emd>
