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        <sites>
            <deposition>RCSB</deposition>
            <last_processing>RCSB</last_processing>
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        <key_dates>
            <deposition>2021-03-28</deposition>
            <header_release>2021-11-17</header_release>
            <map_release>2021-11-17</map_release>
            <update>2025-05-14</update>
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                <funding_body>National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)</funding_body>
                <code>R01GM079429</code>
                <country>United States</country>
            </grant_reference>
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        <title>6-Deoxyerythronolide B synthase (DEBS) hybrid module (M3/1) in complex with antibody fragment 1B2</title>
        <authors_list>
            <author>Cogan DP</author>
            <author>Zhang K</author>
        </authors_list>
        <keywords>polyketide synthase, antibody fragment, BIOSYNTHETIC PROTEIN-IMMUNE SYSTEM complex</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author ORCID="0000-0003-4563-2397" order="1">Cogan DP</author>
                    <author ORCID="0000-0003-0414-4776" order="2">Zhang K</author>
                    <author ORCID="0000-0002-3970-8183" order="3">Li X</author>
                    <author ORCID="0000-0002-7041-5960" order="4">Li S</author>
                    <author order="5">Pintilie GD</author>
                    <author ORCID="0000-0003-3851-7200" order="6">Roh SH</author>
                    <author ORCID="0000-0001-7704-9185" order="7">Craik CS</author>
                    <author ORCID="0000-0002-8910-3078" order="8">Chiu W</author>
                    <author ORCID="0000-0001-6529-495X" order="9">Khosla C</author>
                    <title>Mapping the catalytic conformations of an assembly-line polyketide synthase module.</title>
                    <journal_abbreviation>Science</journal_abbreviation>
                    <country>US</country>
                    <volume>374</volume>
                    <first_page>729</first_page>
                    <last_page>734</last_page>
                    <year>2021</year>
                    <external_references type="PUBMED">34735239</external_references>
                    <external_references type="DOI">doi:10.1126/science.abi8358</external_references>
                    <external_references type="ISSN">1095-9203</external_references>
                    <external_references type="CSD">0038</external_references>
                    <external_references type="ASTM">SCIEAS</external_references>
                </journal_citation>
            </primary_citation>
        </citation_list>
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    <sample>
        <name>Complex between DEBS M3/1TE and antibody fragment 1B2</name>
        <supramolecule_list>
            <complex_supramolecule supramolecule_id="1">
                <name>Complex between DEBS M3/1TE and antibody fragment 1B2</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_list>
                <natural_source database="NCBI">
                    <organism ncbi="1836">Saccharopolyspora erythraea</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.43</theoretical>
                </molecular_weight>
            </complex_supramolecule>
        </supramolecule_list>
        <macromolecule_list>
            <protein_or_peptide macromolecule_id="1">
                <name>6-deoxyerythronolide-B synthase EryA2, modules 3 and 4,EryAI,6-deoxyerythronolide-B synthase EryA3, modules 5 and 6 chimera</name>
                <natural_source database="NCBI">
                    <organism ncbi="1836">Saccharopolyspora erythraea</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.18783542199999997</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="469008">Escherichia coli BL21(DE3)</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MASTDSEKVAEYLRRATLDLRAARQRIRELESDPIAIVSMACRLPGGVNTPQRLWELLREGGETLSGFPTDRGWDLARLH
HPDPDNPGTSYVDKGGFLDDAAGFDAEFFGVSPREAAAMDPQQRLLLETSWELVENAGIDPHSLRGTATGVFLGVAKFGY
GEDTAAAEDVEGYSVTGVAPAVASGRISYTMGLEGPSISVDTACSSSLVALHLAVESLRKGESSMAVVGGAAVMATPGVF
VDFSRQRALAADGRSKAFGAGADGFGFSEGVTLVLLERLSEARRNGHEVLAVVRGSALNQDGASNGLSAPSGPAQRRVIR
QALESCGLEPGDVDAVEAHGTGTALGDPIEANALLDTYGRDRDADRPLWLGSVKSNIGHTQAAAGVTGLLKVVLALRNGE
LPATLHVEEPTPHVDWSSGGVALLAGNQPWRRGERTRRARVSAFGISGTNAHVIVEEAPEREHRETTAHDGRPVPLVVSA
RTTAALRAQAAQIAELLERPDADLAGVGLGLATTRARHEHRAAVVASTREEAVRGLREIAAGAATADAVVEGVTEVDGRN
VVFLFPGQGSQWAGMGAELLSSSPVFAGKIRACDESMAPMQDWKVSDVLRQAPGAPGLDRVDVVQPVLFAVMVSLAELWR
SYGVEPAAVVGHSQGEIAAAHVAGALTLEDAAKLVVGRSRLMRSLSGEGGMAAVALGEAAVRERLRPWQDRLSVAAVNGP
RSVVVSGEPGALRAFSEDCAAEGIRVRDIDVDYASHSPQIERVREELLETTGDIAPRPARVTFHSTVESRSMDGTELDAR
YWYRNLRETVRFADAVTRLAESGYDAFIEVSPHPVVVQAVEEAVEEADGAEDAVVVGSLHRDGGDLSAFLRSMATAHVSG
VDIRWDVALPGAAPFALPTYPFQRKRYWLQPAAPAAASDELAYRIEWRPTGAGEPARLDGTWLVAKYAGTADETSTAARE
ALESAGARVRELVVDARCGRDELAERLRSVGEVAGVLSLLAVDEAEPEEAPLALASLADTLSLVQAMVSAELGCPLWTVT
ESAVATGPFERVRNAAHGALWGVGRVIALENPAVWGGLVDVPAGSVAELARHLAAVVSGGAGEDQLALRADGVYGRRWVR
AAAPATDDEWKPTGTVLVTGGTGGVGGQIARWLARRGAPHLLLVSRSGPDADGAGELVAELEALGARTTVAACDVTDRES
VRELLGGIGDDVPLSAVFHAAATLDDGTVDTLTGERIERASRAKVLGARNLHELTRELDLTAFVLFSSFASAFGAPGLGG
YAPGNAYLDGLAQQRRSDGLPATAVAWGTWAGSGMAEGPVADRFRRHGVIEMPPETACRALQNALDRAEVCPIVIDVRWD
RFLLAYTAQRPTRLFDEIDDARRAAPQAAAEPRVGALASLPAPEREKALFELVRSHAAAVLGHASAERVPADQAFAELGV
DSLSALELRNRLGAATGVRLPTTTVFDHPDVRTLAAHLAAELGSGTPAREASSALRDGYRQAGVSGRVRSYLDLLAGLSD
FREHFDGSDGFSLDLVDMADGPGEVTVICCAGTAAISGPHEFTRLAGALRGIAPVRAVPQPGYEEGEPLPSSMAAVAAVQ
ADAVIRTQGDKPFVVAGHSAGALMAYALATELLDRGHPPRGVVLIDVYPPGHQDAMNAWLEELTATLFDRETVRMDDTRL
TALGAYDRLTGQWRPRETGLPTLLVSAGEPMGPWPDDSWKPTWPFEHDTVAVPGDHFTMVQEHADAIARHIDAWLGGGNS
SSVDKLAAALEHHHHHH</string>
                    <external_references type="UNIPROTKB">Q03132</external_references>
                    <external_references type="UNIPROTKB">Q5UNP6</external_references>
                    <external_references type="UNIPROTKB">Q03133</external_references>
                </sequence>
                <ec_number>2.3.1.94</ec_number>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="2">
                <name>1B2 (heavy chain)</name>
                <natural_source database="NCBI">
                    <organism ncbi="9606">Homo sapiens</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.026447611</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="469008">Escherichia coli BL21(DE3)</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MAEVQLVQSGGGLVQPGRSLRLSCTASGFTFGDYAMSWVRQAPGKGLEWVGFIRSKAYGGTTEYAASVKGRFTISRDDSK
SIAYLQMNSLKTEDTAVYYCTRGGTLFDYWGQGTLVTVSSASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVS
WNSGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEPKSCAALVPRGSAHHHHHHAA
DYKDDDDKA</string>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="3">
                <name>1B2 (light chain)</name>
                <natural_source database="NCBI">
                    <organism ncbi="9606">Homo sapiens</organism>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.025715831999999997</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="469008">Escherichia coli BL21(DE3)</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>LFAIPLVVPFYSHSALDVVMTQSPLSLPVTPGEPASISCRSSQSLLHSNGYNYLDWYLQKPGQSPQLLIYLGSNRASGVP
DRFSGSGSGTDFTLKISRVEAEDVGVYYCMQSLQTPRLTFGPGTKVDIKRTVAAPSVFIFPPSDEQLKSGTASVVCLLNN
FYPRGAKVQWKVDNALQSGNSQESVTEQDSKDSTYSLSSTLTLSKADYEKHKVYACEVTHQGLSSPVTKSFNRGEC</string>
                </sequence>
            </protein_or_peptide>
        </macromolecule_list>
    </sample>
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            <method>singleParticle</method>
            <aggregation_state>particle</aggregation_state>
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                    <concentration units="mg/mL">10</concentration>
                    <buffer>
                        <ph>7.2</ph>
                        <component>
                            <concentration units="mM">100.0</concentration>
                            <formula>C6H8O7</formula>
                            <name>citric acid</name>
                        </component>
                        <component>
                            <concentration units="mM">100.0</concentration>
                            <formula>NaCl</formula>
                            <name>sodium chloride</name>
                        </component>
                        <component>
                            <concentration units="mM">10.0</concentration>
                            <formula>C8H18N2O4S</formula>
                            <name>HEPES</name>
                        </component>
                    </buffer>
                    <vitrification>
                        <cryogen_name>ETHANE</cryogen_name>
                        <chamber_humidity units="percentage">100</chamber_humidity>
                        <chamber_temperature units="K">277.15</chamber_temperature>
                        <instrument>FEI VITROBOT MARK IV</instrument>
                    </vitrification>
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                    <microscope>FEI TITAN KRIOS</microscope>
                    <illumination_mode>OTHER</illumination_mode>
                    <imaging_mode>BRIGHT FIELD</imaging_mode>
                    <electron_source>FIELD EMISSION GUN</electron_source>
                    <acceleration_voltage units="kV">300</acceleration_voltage>
                    <specimen_holder_model>FEI TITAN KRIOS AUTOGRID HOLDER</specimen_holder_model>
                    <cooling_holder_cryogen>NITROGEN</cooling_holder_cryogen>
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                        <image_recording image_recording_id="1">
                            <film_or_detector_model>FEI FALCON IV (4k x 4k)</film_or_detector_model>
                            <number_real_images>3974</number_real_images>
                            <average_exposure_time units="s">8.5</average_exposure_time>
                            <average_electron_dose_per_image units="e/Å^2">50.0</average_electron_dose_per_image>
                        </image_recording>
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                            <name>CTFFIND</name>
                        </software>
                    </software_list>
                    <type>PHASE FLIPPING AND AMPLITUDE CORRECTION</type>
                </ctf_correction>
                <startup_model type_of_model="NONE"/>
                <final_reconstruction>
                    <applied_symmetry>
                        <point_group>C1</point_group>
                    </applied_symmetry>
                    <resolution units="Å" res_type="BY AUTHOR">3.2</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
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                            <name>cryoSPARC</name>
                        </software>
                    </software_list>
                    <number_images_used>93053</number_images_used>
                </final_reconstruction>
                <initial_angle_assignment>
                    <type>MAXIMUM LIKELIHOOD</type>
                </initial_angle_assignment>
                <final_angle_assignment>
                    <type>MAXIMUM LIKELIHOOD</type>
                </final_angle_assignment>
            </singleparticle_processing>
        </structure_determination>
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            <gamma units="deg">90.0</gamma>
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                <source>AUTHOR</source>
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        <annotation_details>M3-1TE</annotation_details>
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