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        <status_history_list>
            <status status_id="1">
                <code>HPUB</code>
            </status>
        </status_history_list>
        <current_status>
            <code>OBS</code>
            <processing_site>PDBj</processing_site>
        </current_status>
        <sites>
            <deposition>RCSB</deposition>
            <last_processing>PDBj</last_processing>
        </sites>
        <key_dates>
            <deposition>2014-05-20</deposition>
            <header_release>2015-01-21</header_release>
            <obsolete>2016-01-13</obsolete>
            <update>2016-01-13</update>
        </key_dates>
        <title>Structure of taste receptor T1r2a/T1r3 heterodimer ligand binding domains, ligand-free form</title>
        <authors_list>
            <author>Nango E</author>
            <author>Maki-Yonekura S</author>
            <author>Ashikawa Y</author>
            <author>Nuemket N</author>
            <author>Kusakabe Y</author>
            <author>Shimizu M</author>
            <author>Krayukhina E</author>
            <author>Uchiyama S</author>
            <author>Akiyama S</author>
            <author>Yonekura K</author>
            <author>Hikima T</author>
            <author>Yamamoto M</author>
            <author>Yamashita A</author>
        </authors_list>
        <keywords>taste receptor, GPCR</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="false">
                    <author order="1">Nango E</author>
                    <author order="2">Maki-Yonekura S</author>
                    <author order="3">Ashikawa Y</author>
                    <author order="4">Nuemket N</author>
                    <author order="5">Kusakabe Y</author>
                    <author order="6">Shimizu M</author>
                    <author order="7">Krayukhina E</author>
                    <author order="8">Uchiyama S</author>
                    <author order="9">Akiyama S</author>
                    <author order="10">Yonekura K</author>
                    <author order="11">Hikima T</author>
                    <author order="12">Yamamoto M</author>
                    <author order="13">Yamashita A</author>
                    <title>Structural organization and conformational change of taste receptor T1r heterodimer extracellular domains</title>
                    <journal>To Be Published</journal>
                </journal_citation>
            </primary_citation>
        </citation_list>
    </crossreferences>
    <sample>
        <name>Ligand binding domains of taste receptor T1r2a/T1r3 heterodimer from medaka fish</name>
        <supramolecule_list>
            <sample_supramolecule supramolecule_id="1000">
                <name>Ligand binding domains of taste receptor T1r2a/T1r3 heterodimer from medaka fish</name>
                <oligomeric_state>heterodimer</oligomeric_state>
                <number_unique_components>2</number_unique_components>
                <molecular_weight>
                    <experimental units="MDa">0.127</experimental>
                    <method>Mass spectroscopy, SDS-PAGE</method>
                </molecular_weight>
            </sample_supramolecule>
        </supramolecule_list>
        <macromolecule_list>
            <protein_or_peptide macromolecule_id="1">
                <name synonym="T1r2a, Tas1r2a">taste receptor, type 1, member 2a</name>
                <natural_source database="NCBI">
                    <organism ncbi="8090">Oryzias latipes</organism>
                    <synonym_organism>medaka fish</synonym_organism>
                </natural_source>
                <number_of_copies>1</number_of_copies>
                <oligomeric_state>protomer in a heterodimer</oligomeric_state>
                <recombinant_exp_flag>true</recombinant_exp_flag>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="7227">Drosophila melanogaster</recombinant_organism>
                    <recombinant_cell>S2</recombinant_cell>
                    <recombinant_plasmid>pAc5.1/V5-His</recombinant_plasmid>
                </recombinant_expression>
                <sequence>
                    <external_references type="UNIPROTKB">Q2MHK5</external_references>
                    <external_references type="GO">GO:0007165</external_references>
                    <external_references type="GO">GO:0007186</external_references>
                    <external_references type="GO">GO:0004871</external_references>
                    <external_references type="GO">GO:0004930</external_references>
                    <external_references type="GO">GO:0005886</external_references>
                    <external_references type="GO">GO:0016020</external_references>
                    <external_references type="GO">GO:0016021</external_references>
                    <external_references type="INTERPRO">IPR000337</external_references>
                    <external_references type="INTERPRO">IPR011500</external_references>
                    <external_references type="INTERPRO">IPR017978</external_references>
                </sequence>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="2">
                <name synonym="T1r3, Tas1r3">taste receptor, type 1, member 3</name>
                <natural_source database="NCBI">
                    <organism ncbi="8090">Oryzias latipes</organism>
                    <synonym_organism>medaka fish</synonym_organism>
                </natural_source>
                <number_of_copies>1</number_of_copies>
                <oligomeric_state>protomer in a heterodimer</oligomeric_state>
                <recombinant_exp_flag>true</recombinant_exp_flag>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="7227">Drosophila melanogaster</recombinant_organism>
                    <recombinant_cell>S2</recombinant_cell>
                    <recombinant_plasmid>pAc5.1/V5-His</recombinant_plasmid>
                </recombinant_expression>
                <sequence>
                    <external_references type="UNIPROTKB">Q2MHK2</external_references>
                    <external_references type="GO">GO:0007165</external_references>
                    <external_references type="GO">GO:0007186</external_references>
                    <external_references type="GO">GO:0004871</external_references>
                    <external_references type="GO">GO:0004930</external_references>
                    <external_references type="GO">GO:0005886</external_references>
                    <external_references type="GO">GO:0016020</external_references>
                    <external_references type="GO">GO:0016021</external_references>
                    <external_references type="INTERPRO">IPR000337</external_references>
                    <external_references type="INTERPRO">IPR011500</external_references>
                    <external_references type="INTERPRO">IPR017978</external_references>
                </sequence>
            </protein_or_peptide>
        </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">
                    <buffer>
                        <ph>8.0</ph>
                        <details>20 mM Tris, 0.3 M NaCl, 2 mM CaCl2</details>
                    </buffer>
                    <staining>
                        <type>NEGATIVE</type>
                        <details>Purified protein solution was applied onto a carbon-coated grid and negatively stained with 2% uranyl acetate.</details>
                    </staining>
                    <grid>
                        <details>400 mesh Cu grid</details>
                    </grid>
                    <vitrification>
                        <cryogen_name>ETHANE</cryogen_name>
                        <instrument>OTHER</instrument>
                    </vitrification>
                </single_particle_preparation>
            </specimen_preparation_list>
            <microscopy_list>
                <single_particle_microscopy microscopy_id="1">
                    <microscope>JEOL 2100</microscope>
                    <illumination_mode>FLOOD BEAM</illumination_mode>
                    <imaging_mode>BRIGHT FIELD</imaging_mode>
                    <electron_source>FIELD EMISSION GUN</electron_source>
                    <acceleration_voltage units="kV">200</acceleration_voltage>
                    <nominal_cs units="mm">3.3</nominal_cs>
                    <nominal_magnification>50000.0</nominal_magnification>
                    <specimen_holder_model>JEOL</specimen_holder_model>
                    <date>2013-02-26</date>
                    <image_recording_list>
                        <image_recording>
                            <film_or_detector_model category="CCD">OTHER</film_or_detector_model>
                            <digitization_details>
                                <sampling_interval units="µm">30</sampling_interval>
                            </digitization_details>
                            <number_real_images>150</number_real_images>
                        </image_recording>
                    </image_recording_list>
                    <specimen_holder>high tilt holder EM-21311HTR</specimen_holder>
                </single_particle_microscopy>
            </microscopy_list>
            <singleparticle_processing image_processing_id="1">
                <final_reconstruction>
                    <algorithm>OTHER</algorithm>
                    <resolution units="Å" res_type="BY AUTHOR">24.0</resolution>
                    <resolution_method>OTHER</resolution_method>
                    <software_list>
                        <software>
                            <name>EMAN</name>
                        </software>
                    </software_list>
                    <number_images_used>8444</number_images_used>
                </final_reconstruction>
            </singleparticle_processing>
        </structure_determination>
    </structure_determination_list>
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        <annotation_details>Reconstruction of taste receptor T1r2a/T1r3 heterodimer ligand binding domains, ligand-free form</annotation_details>
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