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            <update>2025-08-20</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>GM126982</code>
                <country>United States</country>
            </grant_reference>
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                <funding_body>National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)</funding_body>
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        <title>(1-methylalkyl)succinate synthase alpha-beta-gamma-delta complex with bound fumarate</title>
        <authors_list>
            <author>Andorfer MC</author>
            <author>Drennan CL</author>
        </authors_list>
        <keywords>glycyl radical enzyme, (1-methylalkyl)succinate synthase, X-succinate synthase, alkylsuccinate synthase, Hydrocarbon degradation, fumarate addition, LYASE</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author order="1">Andorfer MC</author>
                    <author order="2">Levitz TS</author>
                    <author order="3">Liu J</author>
                    <author order="4">Chakraborty A</author>
                    <author order="5">King-Roberts DT</author>
                    <author order="6">Nweneka D</author>
                    <author order="7">Imrich CN</author>
                    <author ORCID="0000-0001-5486-2755" order="8">Drennan CL</author>
                    <title>Structural basis for anaerobic alkane activation by a multisubunit glycyl radical enzyme.</title>
                    <journal_abbreviation>Proc.Natl.Acad.Sci.USA</journal_abbreviation>
                    <country>US</country>
                    <volume>122</volume>
                    <first_page>e2510389122</first_page>
                    <last_page>e2510389122</last_page>
                    <year>2025</year>
                    <external_references type="PUBMED">40758891</external_references>
                    <external_references type="DOI">doi:10.1073/pnas.2510389122</external_references>
                    <external_references type="ISSN">1091-6490</external_references>
                    <external_references type="CSD">0040</external_references>
                    <external_references type="ASTM">PNASA6</external_references>
                </journal_citation>
            </primary_citation>
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                <details>(1-methylalkyl)succinate synthase alpha-beta-gamma-delta complex with bound fumarate</details>
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    </crossreferences>
    <sample>
        <name>Heterodimer complex of MASS alpha with beta, gamma, delta subunits</name>
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            <complex_supramolecule supramolecule_id="1">
                <name>Heterodimer complex of MASS alpha with beta, gamma, delta subunits</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_list>
                <details>one alpha subunits binds beta, gamma, delta subunits, and the other alpha subunit bind only  gamma subunits.</details>
                <natural_source database="NCBI">
                    <organism ncbi="83404">Azoarcus sp. HxN1</organism>
                </natural_source>
                <molecular_weight>
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                </molecular_weight>
            </complex_supramolecule>
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            <protein_or_peptide macromolecule_id="1">
                <name>1-methyl alkyl succinate synthase subunit MasD</name>
                <natural_source database="NCBI">
                    <organism ncbi="83404">Azoarcus sp. HxN1</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.097053289</theoretical>
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                <number_of_copies>2</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="1354003">Escherichia coli</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MGSSHHHHHHSQMTATSTLSKTDLKNCETVEELRENQQWWWLAERERSARLDYLRKATWKKGALGGNYFDGIRLDLEYPT
LFTEAWKKYPNDPSMLRRAKATAYVLDNISIFITDSAQLVGYVGSAPHTIAWRVDGASTVNSEVYNEPGIHAEPEAESLK
KVAEINSYWNGQTAVDKVGRLIDPEDAVKFFSGAIGWGTPSSAFGYSGKNFEYFMKGDRAFSQIIAEIDEKIDEAEEATI
GTPSPHILPLYDKLNNWHAMKLVLEAAIRFAGRYARLARVMAAKETDEQRKKELLRVAETCERVPANPPRNLQESLQYEH
FVQVLARYEAHEGAWPSRPDYYHGPLYAKDVEVEKNITESEAIDLVGEYMIRCSEYGSFSPRYMREGLQGVTGTFVWTLG
GVNQDGTDACNGMTIALLKAARLVRVANPTFGFRWHPKVSNEVLRECFECIRQGLGYPTLRNDPVLIQNTMHWYGHPLEE
ARTWVHMACMSPNPTTKHGTSPFRMASATMNSAKTIEYVLHNGYDRVVNMQMGPKTGDAREIKDFEDLFERWTVQLKWLM
NLLVRTVNLGRFKDPEFFGRPFLSAITERAVEHGIDAVSPEGERGNAWVTAFTWIENVDSMAAIKKLVFDDKKYTMSQLI
DALEAEWDGYEQMRLDFVKNGPKWGNDDDYVDDIMLRCLSVAAEHSRNIQCTSGNCWPILPENVSGNIHYANIVGALPNG
RRRGDALYDGGVSPGPGLDKAGPTAVLKSVGKIDHVNQGRSFLLNQRLSPTQLAGDKGFQLWNSYVRTWAELGIDHIQFN
VISDKVLRAAQNDPEGYQEVIVRVAGYSAHFIDISRKTQDNIIQRTVQGLGENLYFQG</string>
                    <external_references type="UNIPROTKB">A9J4K4</external_references>
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                <natural_source database="NCBI">
                    <organism ncbi="83404">Azoarcus sp. HxN1</organism>
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                <molecular_weight>
                    <theoretical units="MDa">0.013460091</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="561">Escherichia coli</recombinant_organism>
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                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MSRRDEWKKLQEEMTRDGGEIKSLETVPEQACGICLNFTDNAYGSDGRGSCNVLKAGSNISLPDVIITRSGENGYITFFN
SDAKYCPNFERMKLIDTDGHECADPISRRVQRQLSSIKKS</string>
                    <external_references type="UNIPROTKB">A9J4K0</external_references>
                </sequence>
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            <protein_or_peptide macromolecule_id="3">
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                    <organism ncbi="83404">Azoarcus sp. HxN1</organism>
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                    <theoretical units="MDa">0.0068945529999999994</theoretical>
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                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="562">Escherichia coli</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>STCKECRNYFPINEEASRGDCVRRISDERQSYYTARPTTEAAKCEGCSDYLENTRTAKAH</string>
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            <protein_or_peptide macromolecule_id="4">
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                <natural_source database="NCBI">
                    <organism ncbi="83404">Azoarcus sp. HxN1</organism>
                </natural_source>
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                <number_of_copies>1</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="562">Escherichia coli</recombinant_organism>
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                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MKCTECGHEAEVMKFRYHYNPRIDASLSLRQCPECQAVVTVDELKREVLGRMHNGDDPWGKSAGIENLAEG</string>
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                <name>FUMARIC ACID</name>
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                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <formula>FUM</formula>
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            <ligand macromolecule_id="6">
                <name>2,3-DIHYDROXY-1,4-DITHIOBUTANE</name>
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                <number_of_copies>1</number_of_copies>
                <formula>DTT</formula>
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            <ligand macromolecule_id="7">
                <name>IRON/SULFUR CLUSTER</name>
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                    <theoretical units="MDa">0.00035163999999999996</theoretical>
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                <formula>SF4</formula>
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            <ligand macromolecule_id="8">
                <name>FE (III) ION</name>
                <molecular_weight>
                    <theoretical units="MDa">5.5845e-05</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <formula>FE</formula>
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        </macromolecule_list>
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                            <name>Sodium Chloride</name>
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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>
                </axis_order>
                <statistics>
                    <minimum>-0.023669507</minimum>
                    <maximum>0.09722458</maximum>
                    <average>0.000008766079</average>
                    <std>0.0017515301</std>
                </statistics>
                <pixel_spacing>
                    <x units="Å">1.17</x>
                    <y units="Å">1.17</y>
                    <z units="Å">1.17</z>
                </pixel_spacing>
                <contour_list>
                    <contour primary="true">
                        <source>AUTHOR</source>
                    </contour>
                </contour_list>
                <label>::::EMDATABANK.org::::EMD-70238::::</label>
            </half_map>
        </half_map_list>
    </interpretation>
</emd>
