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    <admin>
        <current_status>
            <date>2025-11-26</date>
            <code>REL</code>
            <processing_site>PDBc</processing_site>
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        </revision_history>
        <sites>
            <deposition>PDBj</deposition>
            <last_processing>PDBc</last_processing>
        </sites>
        <key_dates>
            <deposition>2025-01-28</deposition>
            <header_release>2025-11-26</header_release>
            <map_release>2025-11-26</map_release>
            <update>2025-11-26</update>
        </key_dates>
        <grant_support>
            <grant_reference>
                <funding_body>National Natural Science Foundation of China (NSFC)</funding_body>
                <country>China</country>
            </grant_reference>
        </grant_support>
        <title>Cryo-EM structure of NTR-bound type III-B CRISPR-Cas effector complex</title>
        <authors_list>
            <author>Jin X</author>
            <author>Duan B</author>
            <author>Chen Z</author>
            <author>Zhao B</author>
        </authors_list>
        <keywords>CRISPR-Cas complex, adaptive immunity, RNA degradation, second messenger, IMMUNE SYSTEM/RNA, IMMUNE SYSTEM-RNA complex</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="false">
                    <author order="1">Duan B</author>
                    <author order="2">Jin X</author>
                    <author order="3">Chen Z</author>
                    <author order="4">Zhao B</author>
                    <title>Mechanisms of SAM-AMP synthesis and degradation in antiviral type III CRISPR signaling.</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>9lq7</pdb_id>
                <relationship>
                    <in_frame>FULLOVERLAP</in_frame>
                </relationship>
            </pdb_reference>
        </pdb_list>
        <other_db_list>
            <db_reference>
                <db_name>EMDB</db_name>
                <accession_id>EMD-63295</accession_id>
                <content_type>associated EM volume</content_type>
                <details>Cryo-EM structure of NTR-bound type III-B CRISPR-Cas effector complex</details>
            </db_reference>
        </other_db_list>
    </crossreferences>
    <sample>
        <name>NTR-bound type III-B CRISPR-Cas effector complex</name>
        <supramolecule_list>
            <complex_supramolecule supramolecule_id="1">
                <name>NTR-bound type III-B CRISPR-Cas effector complex</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>
                        <macromolecule_id>5</macromolecule_id>
                    </macromolecule>
                    <macromolecule>
                        <macromolecule_id>6</macromolecule_id>
                    </macromolecule>
                    <macromolecule>
                        <macromolecule_id>7</macromolecule_id>
                    </macromolecule>
                    <macromolecule>
                        <macromolecule_id>8</macromolecule_id>
                    </macromolecule>
                </macromolecule_list>
                <natural_source database="NCBI">
                    <organism ncbi="817">Bacteroides fragilis</organism>
                </natural_source>
            </complex_supramolecule>
        </supramolecule_list>
        <macromolecule_list>
            <protein_or_peptide macromolecule_id="1">
                <name>Cmr1</name>
                <natural_source database="NCBI">
                    <organism ncbi="817">Bacteroides fragilis</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.05534025</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>MNQLTAILKQHTPMIHFQHNESGATLRASEVKPLLDKFILTKLGNGDIREGRLYAKKNNWLIDNEKNYALNYKLSISLQK
KSRLEYLITSSTFPLPTERPSNFFTIQNSPYFAQEKCVGINTNSTIILKKSNSDPRKKEAEFKEKNWSQIDKKGLEWQDF
TIKIFSLKGDLINKIQTYLPAFFICHNFGTRNNKGFGSFTVEYINNQKNICNVEDTLKENFAFVYKKKIALSRQSTLDFI
YIYNQIFSTIKKDYQILKSGYNFRNEYIKSLLFCYFVSKYPNYRWEKRKMKQLIKARGYELKGDHSPISGIRENDNSWND
PNPNGYNYAYIRAILGLAEQYEFQLETPYQKAIVKIKSANNCISRYKSPLLFKIINNSIYLVGNEINTEILNKPFQYSYI
EQTKNKNMRTGKSEITERTMHINEIEMNYKNRINYHYTPTSFSLIDFMQYAMSYKKNGKNILNYIPLKQ</string>
                    <external_references type="UNIPROTKB">A0A5M5QTL0</external_references>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="2">
                <name>Type III-B CRISPR-associated protein Cas10/Cmr2</name>
                <natural_source database="NCBI">
                    <organism ncbi="817">Bacteroides fragilis</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.06924707799999999</theoretical>
                </molecular_weight>
                <details>deletioins</details>
                <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>MKYIAITLGPITRTIEMAESTKELWAASYFFSYLAKKIVEPFVKKNRTFQLPLINEEMQKPHCGAGLFPDRYIFKSEPGD
LELLKQHSDQVLIEIAGHIASPSLPGTAKDVSQIYHYLKSYIKIYFIERTLESDDPHVVIPACEKYLNIIENQETFPEQE
ETMISHQKSDFLKFLITNVNGKIYRKDKNSIPRFTGSFLTRDAFGDMNGERLFESILEISASELNINIQQKALEVITANE
KNKGEKYSDQIWDAEEIILNDNKAQLRPYHKYIAIIKSDGDSMGETIKSMGAYNIPITQLSKALLSFNIESINEIVAYGG
KPIFIGGDDLLCFAPVCCNGNNVFNLVEKLSTCFDQCINQHLQQYINACSEAQRPLPSLSFGISITYHKYPMFEALHTTD
YLLEMVAKDNLFKYTLSNKNILNENMKRFILKNKLAFSLQKHSGQIYHTAMSKKGKSYVKFNMLLQKYILKNKDMSKTQE
SEKFLSSVIQMIRAHAEILQIILQNEDKRTEMLKNYFDNNFNESCHLGYTGLFEDIQTLLCLRYQENIQDYQNRNEIIQQ
NTILTSDEKEILIVSPAMDAIHTIFTALQFIHFINYNKDE</string>
                    <external_references type="UNIPROTKB">A0A5C6J4N7</external_references>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="3">
                <name>CRISPR-associated protein Cmr3</name>
                <natural_source database="NCBI">
                    <organism ncbi="817">Bacteroides fragilis</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.049059207</theoretical>
                </molecular_weight>
                <details>deletions</details>
                <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>MSHHHHHHHHDGKPIPNPLLGLDSTGSDQTENSGENLYFQGANAMNRHYLITLTPMDWFFFGGERTLDDGKSADYISHSN
KFPQQSALLGMIRYQLLKQHNLLSQFPYTENKPTEKEIMKTLIGEQSFRMTERKAKSLGLGVIKQISPLMLIECKDDTSS
RSIYFPLPLDDGYKVSFNETSNEDKVFYNGIECPIPNVYPASEEQDSGNQKRKFFDHKTYNNYLFWCTQGNNQIKKLLSD
EIWISKMQIGITKHVEEGEDNDKSFYKQEFLQLKKSFIYAFYITLSGESELSSDIIQLGGQRSVFRMEVESIEENSDIQE
KYQTAAQFLTQSDRLLILSPTYVDNLKELSALCNFMWSDSIVFRNIQTTNASNFYGKPIKSSSKYHFLKPGSVLYFKQGK
RKEVEKLLMDYTYLRLSGYNIYI</string>
                    <external_references type="UNIPROTKB">A0A9X9IKM4</external_references>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="4">
                <name>Type III-B CRISPR module RAMP protein Cmr4</name>
                <natural_source database="NCBI">
                    <organism ncbi="817">Bacteroides fragilis</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.031537041</theoretical>
                </molecular_weight>
                <number_of_copies>3</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="562">Escherichia coli</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MTTRMYVINTLSNMHVGSGEVNYGVIANLIQRDSVTNLPNINSSGLKGAIREYFKENEDLVRELFGSAPRDEKTLPGKVR
FFEANLLSMPVRSDKVPFLMAISDEVLQELITKMKFFNCEEATQYISHLSTLLDNIKTQAQGTDFAYVFDPLLQGAIIEE
VSIRATCPSHIPLQPSLKKLLGDRLVILSHKYFSILSDDNHLPVLSRNNLENGQSANLWYEQVLPRYSRLYFMLMDGNAQ
SEYLKKFRDTLCTPSTIIQIGANASIGYGYCQISELSPF</string>
                    <external_references type="UNIPROTKB">A0A9X9NER2</external_references>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="5">
                <name>CRISPR type III-B/RAMP module-associated protein Cmr5</name>
                <natural_source database="NCBI">
                    <organism ncbi="817">Bacteroides fragilis</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.015273492999999999</theoretical>
                </molecular_weight>
                <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>MKISKKQIEYAIEALRANNIITNDNQYPKVFKGYISSFGAAVIQSGLIPAIIFFENEDNDANADRHKIIGVLKDIINAMR
QQYTVTDATILVSSQIPANYSMAQYIIEHGNTDQLLKEITEAAVAMKLALRMYKSE</string>
                    <external_references type="UNIPROTKB">A0A2M9V7H9</external_references>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="6">
                <name>RAMP superfamily protein</name>
                <natural_source database="NCBI">
                    <organism ncbi="817">Bacteroides fragilis</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.035951883</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>MPKNYTLQNASNLGWLFYKDYYRQEPNVDFISTQGKESDTTADFFRKTNQRITAYQLNSESPLVAAFNNHFGTPLQLKTI
YPGLITGSGLPHQTGSKGEFKLGFQFDYTTGLPYIPGSSIKGTLRSMFPFSLKDKGSTKRILPEYRKERMEYIRDLIIEV
TNINEISDTEIQALEYAIFTNSTPSGKTIEFSLEEKDVFYDAFVADSKDGVMLSDDYITPHGENPLKDPKPILFLKIRPD
VTINFYFKLCTTHLYKEKVCSSKQIEEIKKQNDFSSSDYKMITAHQKRNLFEKILLCIGIGAKTNIGYGQLKKL</string>
                    <external_references type="UNIPROTKB">A0A2M9V7I0</external_references>
                </sequence>
            </protein_or_peptide>
            <rna macromolecule_id="7">
                <name>NTR</name>
                <natural_source database="NCBI">
                    <organism ncbi="817">Bacteroides fragilis</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.015672396</theoretical>
                </molecular_weight>
                <details>deletions</details>
                <number_of_copies>1</number_of_copies>
                <sequence>
                    <string>CACAAGGGACGCCACUUCAUGGAAAUAAAUCACUCACGAAUGUCUUAAU</string>
                </sequence>
            </rna>
            <rna macromolecule_id="8">
                <name>crRNA</name>
                <natural_source database="NCBI">
                    <organism ncbi="817">Bacteroides fragilis</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.015671214</theoretical>
                </molecular_weight>
                <details>deletions</details>
                <number_of_copies>1</number_of_copies>
                <sequence>
                    <string>AUUAAGACAUUCGUGAGUGAUUUAUUUCCAUGAAGUGGCGUCCCUUGUG</string>
                </sequence>
            </rna>
            <ligand macromolecule_id="9">
                <name>ADENOSINE-5'-TRIPHOSPHATE</name>
                <molecular_weight>
                    <theoretical units="MDa">0.000507181</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <formula>ATP</formula>
            </ligand>
            <ligand macromolecule_id="10">
                <name>S-ADENOSYLMETHIONINE</name>
                <molecular_weight>
                    <theoretical units="MDa">0.000398437</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <formula>SAM</formula>
            </ligand>
            <ligand macromolecule_id="11">
                <name>MANGANESE (II) ION</name>
                <molecular_weight>
                    <theoretical units="MDa">5.4938e-05</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <formula>MN</formula>
            </ligand>
        </macromolecule_list>
    </sample>
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                    <buffer>
                        <ph>7.5</ph>
                    </buffer>
                    <vitrification>
                        <cryogen_name>ETHANE</cryogen_name>
                        <chamber_humidity units="percentage">100</chamber_humidity>
                    </vitrification>
                </single_particle_preparation>
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            <microscopy_list>
                <single_particle_microscopy microscopy_id="1">
                    <microscope>TFS 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_defocus_min units="µm">1.0</nominal_defocus_min>
                    <nominal_defocus_max units="µm">3.0</nominal_defocus_max>
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                        <image_recording image_recording_id="1">
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                        </image_recording>
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                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
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