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        <key_dates>
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            <header_release>2024-10-30</header_release>
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            <update>2025-05-07</update>
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        <grant_support>
            <grant_reference>
                <funding_body>Swiss National Science Foundation</funding_body>
                <code>31003A_182567</code>
                <country>Switzerland</country>
            </grant_reference>
        </grant_support>
        <title>Cryo-EM structure of human tRNA ligase RTCB in complex with human PYROXD1.</title>
        <authors_list>
            <author>Loeff L</author>
            <author>Kroupova A</author>
            <author>Asanovic I</author>
            <author>Boneberg F</author>
            <author>Pfleiderer MM</author>
            <author>Ferdigg A</author>
            <author>Ackle F</author>
            <author>Martinez J</author>
            <author>Jinek M</author>
        </authors_list>
        <keywords>tRNA ligase, PYROXD1, RTCB, Flavoprotein, Ligase</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author order="1">Loeff L</author>
                    <author order="2">Kroupova A</author>
                    <author order="3">Asanovic I</author>
                    <author order="4">Boneberg FM</author>
                    <author ORCID="0000-0002-2369-5824" order="5">Pfleiderer MM</author>
                    <author ORCID="0009-0007-9869-589X" order="6">Riermeier L</author>
                    <author ORCID="0000-0003-4126-0725" order="7">Leitner A</author>
                    <author ORCID="0000-0002-9382-0985" order="8">Ferdigg A</author>
                    <author ORCID="0000-0002-7199-5004" order="9">Ackle F</author>
                    <author ORCID="0000-0001-9152-7323" order="10">Martinez J</author>
                    <author ORCID="0000-0002-7601-210X" order="11">Jinek M</author>
                    <title>Mechanistic basis for PYROXD1-mediated protection of the human tRNA ligase complex against oxidative inactivation.</title>
                    <journal_abbreviation>Nat.Struct.Mol.Biol.</journal_abbreviation>
                    <country>US</country>
                    <year>2025</year>
                    <external_references type="PUBMED">40069351</external_references>
                    <external_references type="DOI">doi:10.1038/s41594-025-01516-6</external_references>
                    <external_references type="ISSN">1545-9985</external_references>
                </journal_citation>
            </primary_citation>
            <secondary_citation>
                <journal_citation published="true">
                    <author ORCID="0000-0002-1805-7844" order="12">Loeff L</author>
                    <author ORCID="0000-0003-4166-1270" order="13">Kroupova A</author>
                    <author ORCID="0000-0002-2571-4451" order="14">Asanovic I</author>
                    <author ORCID="0000-0002-5955-7343" order="15">Boneberg F</author>
                    <author ORCID="0000-0002-2369-5824" order="16">Pfleiderer MM</author>
                    <author ORCID="0000-0002-9382-0985" order="17">Ferdigg A</author>
                    <author ORCID="0000-0002-7199-5004" order="18">Ackle F</author>
                    <author ORCID="0000-0001-9152-7323" order="19">Martinez J</author>
                    <author ORCID="0000-0002-7601-210X" order="20">Jinek M</author>
                    <title>Mechanistic basis for oxidative stress protection of the human tRNA ligase complex by the oxidoreductase PYROXD1</title>
                    <journal_abbreviation>BioRxiv</journal_abbreviation>
                    <country>US</country>
                    <year>2023</year>
                    <external_references type="DOI">doi:10.1101/2023.04.06.535761</external_references>
                    <external_references type="ISSN">2692-8205</external_references>
                </journal_citation>
            </secondary_citation>
        </citation_list>
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                <relationship>
                    <in_frame>FULLOVERLAP</in_frame>
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            </pdb_reference>
        </pdb_list>
    </crossreferences>
    <sample>
        <name>Cryo-EM structure of human RTCB in complex with human PYROXD1.</name>
        <supramolecule_list>
            <complex_supramolecule supramolecule_id="1">
                <name>Cryo-EM structure of human RTCB in complex with human PYROXD1.</name>
                <parent>0</parent>
                <macromolecule_list>
                    <macromolecule>
                        <macromolecule_id>1</macromolecule_id>
                    </macromolecule>
                    <macromolecule>
                        <macromolecule_id>2</macromolecule_id>
                    </macromolecule>
                </macromolecule_list>
                <details>In vitro reconstituted protein complex</details>
                <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>RNA-splicing ligase RtcB homolog</name>
                <natural_source database="NCBI">
                    <organism ncbi="9606">Homo sapiens</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.055556444999999996</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="7108">Spodoptera frugiperda</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>SNAMSRSYNDELQFLEKINKNCWRIKKGFVPNMQVEGVFYVNDALEKLMFEELRNACRGGGVGGFLPAMKQIGNVAALPG
IVHRSIGLPDVHSGYGFAIGNMAAFDMNDPEAVVSPGGVGFDINCGVRLLRTNLDESDVQPVKEQLAQAMFDHIPVGVGS
KGVIPMNAKDLEEALEMGVDWSLREGYAWAEDKEHCEEYGRMLQADPNKVSARAKKRGLPQLGTLGAGNHYAEIQVVDEI
FNEYAAKKMGIDHKGQVCVMIHSGSRGLGHQVATDALVAMEKAMKRDKIIVNDRQLACARIASPEGQDYLKGMAAAGNYA
WVNRSSMTFLTRQAFAKVFNTTPDDLDLHVIYDVSHNIAKVEQHVVDGKERTLLVHRKGSTRAFPPHHPLIAVDYQLTGQ
PVLIGGTMGTCSYVLTGTEQGMTETFGTTCHGAGRALSRAKSRRNLDFQDVLDKLADMGIAIRVASPKLVMEEAPESYKN
VTDVVNTCHDAGISKKAIKLRPIAVIKG</string>
                    <external_references type="UNIPROTKB">Q9Y3I0</external_references>
                </sequence>
                <ec_number>6.5.1.8</ec_number>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="2">
                <name>Pyridine nucleotide-disulfide oxidoreductase domain-containing protein 1</name>
                <natural_source database="NCBI">
                    <organism ncbi="9606">Homo sapiens</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.056016858999999995</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>GPMEAARPPPTAGKFVVVGGGIAGVTCAEQLATHFPSEDILLVTASPVIKAVTNFKQISKILEEFDVEEQSSTMLGKRFP
NIKVIESGVKQLKSEEHCIVTEDGNQHVYKKLCLCAGAKPKLICEGNPYVLGIRDTDSAQEFQKQLTKAKRIMIIGNGGI
ALELVYEIEGCEVIWAIKDKAIGNTFFDAGAAEFLTSKLIAEKSEAKIAHKRTRYTTEGRKKEARSKSKADNVGSALGPD
WHEGLNLKGTKEFSHKIHLETMCEVKKIYLQDEFRILKKKSFTFPRDHKSVTADTEMWPVYVELTNEKIYGCDFIVSATG
VTPNVEPFLHGNSFDLGEDGGLKVDDHMHTSLPDIYAAGDICTTSWQLSPVWQQMRLWTQARQMGWYAAKCMAAASSGDS
IDMDFSFELFAHVTKFFNYKVVLLGKYNAQGLGSDHELMLRCTKGREYIKVVMQNGRMMGAVLIGETDLEETFENLILNQ
MNLSSYGEDLLDPNIDIEDYFD</string>
                    <external_references type="UNIPROTKB">Q8WU10</external_references>
                </sequence>
                <ec_number>1.8.1.-</ec_number>
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                <name>MAGNESIUM ION</name>
                <molecular_weight>
                    <theoretical units="MDa">2.4305e-05</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <formula>MG</formula>
            </ligand>
            <ligand macromolecule_id="4">
                <name>NICOTINAMIDE-ADENINE-DINUCLEOTIDE</name>
                <molecular_weight>
                    <theoretical units="MDa">0.0006634249999999999</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <formula>NAD</formula>
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            <ligand macromolecule_id="5">
                <name>DIHYDROFLAVINE-ADENINE DINUCLEOTIDE</name>
                <molecular_weight>
                    <theoretical units="MDa">0.000787566</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <formula>FDA</formula>
            </ligand>
        </macromolecule_list>
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            <method>singleParticle</method>
            <aggregation_state>particle</aggregation_state>
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                <single_particle_preparation preparation_id="1">
                    <concentration units="mg/mL">0.6</concentration>
                    <buffer>
                        <ph>8.0</ph>
                        <component>
                            <concentration units="mM">20.0</concentration>
                            <formula>C8H18N2O4S</formula>
                            <name>HEPES</name>
                        </component>
                        <component>
                            <concentration units="mM">150.0</concentration>
                            <formula>NaCl</formula>
                            <name>Sodium chloride</name>
                        </component>
                        <component>
                            <concentration units="mM">5.0</concentration>
                            <formula>MgCl2</formula>
                            <name>Magnesium chloride</name>
                        </component>
                        <component>
                            <concentration units="mM">0.5</concentration>
                            <formula>C9H15O6P</formula>
                            <name>TCEP</name>
                        </component>
                        <component>
                            <concentration units="mM">0.5</concentration>
                            <formula>C21H27N7O14P2</formula>
                            <name>NADH</name>
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Dataset 2: 20 mM HEPES pH 8.0, 150 mM NaCl, 0.5 mM TCEP, 5 mM MgCl2 and 0.5 mM NADH</details>
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                        <cryogen_name>ETHANE</cryogen_name>
                        <chamber_humidity units="percentage">80</chamber_humidity>
                        <chamber_temperature units="K">277.15</chamber_temperature>
                        <instrument>FEI VITROBOT MARK IV</instrument>
                    </vitrification>
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Protein concentration per dataset: 
Dataset 1: 1.5 mg/ ml
Dataset 2: 0.6 mg/ ml</details>
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                    <nominal_cs units="mm">2.7</nominal_cs>
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                        <coma_free/>
                    </alignment_procedure>
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                        </image_recording>
                        <image_recording image_recording_id="2">
                            <film_or_detector_model>GATAN K3 (6k x 4k)</film_or_detector_model>
                            <number_grids_imaged>1</number_grids_imaged>
                            <number_real_images>9302</number_real_images>
                            <average_electron_dose_per_image units="e/Å^2">66.459</average_electron_dose_per_image>
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                    </image_recording_list>
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                    <software_list>
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                            <name>cryoSPARC</name>
                            <version>2.3.3</version>
                        </software>
                    </software_list>
                    <type>PHASE FLIPPING AND AMPLITUDE CORRECTION</type>
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                    <applied_symmetry>
                        <point_group>C1</point_group>
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                    <resolution units="Å" res_type="BY AUTHOR">3.3</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
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                            <version>3.3.2</version>
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                    <software_list>
                        <software>
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                    <a units="Å">187.2</a>
                    <b units="Å">187.2</b>
                    <c units="Å">187.2</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>-0.1491956</minimum>
                    <maximum>0.21862562</maximum>
                    <average>0.00021785569</average>
                    <std>0.015488094</std>
                </statistics>
                <pixel_spacing>
                    <x units="Å">0.65</x>
                    <y units="Å">0.65</y>
                    <z units="Å">0.65</z>
                </pixel_spacing>
                <contour_list>
                    <contour primary="true">
                        <source>AUTHOR</source>
                    </contour>
                </contour_list>
                <label>::::EMDATABANK.org::::EMD-17127::::</label>
                <annotation_details>Unsharpened map</annotation_details>
            </half_map>
        </half_map_list>
    </interpretation>
</emd>
