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        <sites>
            <deposition>RCSB</deposition>
            <last_processing>RCSB</last_processing>
        </sites>
        <key_dates>
            <deposition>2018-11-04</deposition>
            <header_release>2019-03-06</header_release>
            <map_release>2019-03-06</map_release>
            <update>2025-06-04</update>
        </key_dates>
        <grant_support>
            <grant_reference>
                <funding_body>National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)</funding_body>
                <code>EY009339</code>
                <country>United States</country>
            </grant_reference>
            <grant_reference>
                <funding_body>National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)</funding_body>
                <code>EY027283</code>
                <country>United States</country>
            </grant_reference>
            <grant_reference>
                <funding_body>National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)</funding_body>
                <code>EY024864</code>
                <country>United States</country>
            </grant_reference>
        </grant_support>
        <title>Cryo-EM structure of phosphodiesterase 6</title>
        <authors_list>
            <author>Gulati S</author>
            <author>Palczewski K</author>
            <author>Kovacik L</author>
            <author>Stahlberg H</author>
        </authors_list>
        <keywords>GAF domain, phosphohydrolase, G protein-coupled receptor signaling, SIGNALING PROTEIN</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author ORCID="0000-0002-8255-479X" order="1">Gulati S</author>
                    <author ORCID="0000-0002-0788-545X" order="2">Palczewski K</author>
                    <author ORCID="0000-0002-0118-8733" order="3">Engel A</author>
                    <author ORCID="0000-0002-1185-4592" order="4">Stahlberg H</author>
                    <author ORCID="0000-0002-0644-3027" order="5">Kovacik L</author>
                    <title>Cryo-EM structure of phosphodiesterase 6 reveals insights into the allosteric regulation of type I phosphodiesterases.</title>
                    <journal_abbreviation>Sci Adv</journal_abbreviation>
                    <country>US</country>
                    <volume>5</volume>
                    <first_page>eaav4322</first_page>
                    <last_page>eaav4322</last_page>
                    <year>2019</year>
                    <external_references type="PUBMED">30820458</external_references>
                    <external_references type="DOI">doi:10.1126/sciadv.aav4322</external_references>
                    <external_references type="ISSN">2375-2548</external_references>
                </journal_citation>
            </primary_citation>
        </citation_list>
        <pdb_list>
            <pdb_reference>
                <pdb_id>6mzb</pdb_id>
                <relationship>
                    <in_frame>FULLOVERLAP</in_frame>
                </relationship>
            </pdb_reference>
        </pdb_list>
    </crossreferences>
    <sample>
        <name>Phosphodiesterase 6</name>
        <supramolecule_list>
            <complex_supramolecule supramolecule_id="1">
                <name>Phosphodiesterase 6</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="9913">Bos taurus</organism>
                </natural_source>
            </complex_supramolecule>
        </supramolecule_list>
        <macromolecule_list>
            <protein_or_peptide macromolecule_id="1">
                <name>Rod cGMP-specific 3',5'-cyclic phosphodiesterase subunit beta</name>
                <natural_source database="NCBI">
                    <organism ncbi="9913">Bos taurus</organism>
                    <organ>Eye</organ>
                    <tissue>Retina</tissue>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.098449648</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="9913">Bos taurus</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MSLSEGQVHRFLDQNPGFADQYFGRKLSPEDVANACEDGCPEGCTSFRELCQVEESAALFELVQDMQENVNMERVVFKIL
RRLCSILHADRCSLFMYRQRNGVAELATRLFSVQPDSVLEDCLVPPDSEIVFPLDIGVVGHVAQTKKMVNVQDVMECPHF
SSFADELTDYVTRNILATPIMNGKDVVAVIMAVNKLDGPCFTSEDEDVFLKYLNFGTLNLKIYHLSYLHNCETRRGQVLL
WSANKVFEELTDIERQFHKAFYTVRAYLNCDRYSVGLLDMTKEKEFFDVWPVLMGEAQAYSGPRTPDGREILFYKVIDYI
LHGKEDIKVIPSPPADHWALASGLPTYVAESGFICNIMNAPADEMFNFQEGPLDDSGWIVKNVLSMPIVNKKEEIVGVAT
FYNRKDGKPFDEQDEVLMESLTQFLGWSVLNTDTYDKMNKLENRKDIAQDMVLYHVRCDREEIQLILPTRERLGKEPADC
EEDELGKILKEVLPGPAKFDIYEFHFSDLECTELELVKCGIQMYYELGVVRKFQIPQEVLVRFLFSVSKGYRRITYHNWR
HGFNVAQTMFTLLMTGKLKSYYTDLEAFAMVTAGLCHDIDHRGTNNLYQMKSQNPLAKLHGSSILERHHLEFGKFLLSEE
TLNIYQNLNRRQHEHVIHLMDIAIIATDLALYFKKRTMFQKIVDESKNYEDRKSWVEYLSLETTRKEIVMAMMMTACDLS
AITKPWEVQSKVALLVAAEFWEQGDLERTVLDQQPIPMMDRNKAAELPKLQVGFIDFVCTFVYKEFSRFHEEILPMFDRL
QNNRKEWKALADEYEAKVKALEEDQKKETTAKKVGTEICNGGPAPRSSTCRIL</string>
                    <external_references type="UNIPROTKB">P23439</external_references>
                </sequence>
                <ec_number>3.1.4.35</ec_number>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="2">
                <name>Rod cGMP-specific 3',5'-cyclic phosphodiesterase subunit alpha</name>
                <natural_source database="NCBI">
                    <organism ncbi="9913">Bos taurus</organism>
                    <organ>Eye</organ>
                    <tissue>Retina</tissue>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.099461789</theoretical>
                </molecular_weight>
                <number_of_copies>1</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="9913">Bos taurus</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MGEVTAEEVEKFLDSNVSFAKQYYNLRYRAKVISDLLGPREAAVDFSNYHALNSVEESEIIFDLLRDFQDNLQAEKCVFN
VMKKLCFLLQADRMSLFMYRARNGIAELATRLFNVHKDAVLEECLVAPDSEIVFPLDMGVVGHVALSKKIVNVPNTEEDE
HFCDFVDTLTEYQTKNILASPIMNGKDVVAIIMVVNKVDGPHFTENDEEILLKYLNFANLIMKVFHLSYLHNCETRRGQI
LLWSGSKVFEELTDIERQFHKALYTVRAFLNCDRYSVGLLDMTKQKEFFDVWPVLMGEAPPYAGPRTPDGREINFYKVID
YILHGKEDIKVIPNPPPDHWALVSGLPTYVAQNGLICNIMNAPSEDFFAFQKEPLDESGWMIKNVLSMPIVNKKEEIVGV
ATFYNRKDGKPFDEMDETLMESLTQFLGWSVLNPDTYELMNKLENRKDIFQDMVKYHVKCDNEEIQTILKTREVYGKEPW
ECEEEELAEILQGELPDADKYEINKFHFSDLPLTELELVKCGIQMYYELKVVDKFHIPQEALVRFMYSLSKGYRRITYHN
WRHGFNVGQTMFSLLVTGKLKRYFTDLEALAMVTAAFCHDIDHRGTNNLYQMKSQNPLAKLHGSSILERHHLEFGKTLLR
DESLNIFQNLNRRQHEHAIHMMDIAIIATDLALYFKKRTMFQKIVDQSKTYETQQEWTQYMMLDQTRKEIVMAMMMTACD
LSAITKPWEVQSKVALLVAAEFWEQGDLERTVLQQNPIPMMDRNKADELPKLQVGFIDFVCTFVYKEFSRFHEEITPMLD
GITNNRKEWKALADEYETKMKGLEEEKQKQQAANQAAAGSQHGGKQPGGGPASKSCCVQ</string>
                    <external_references type="UNIPROTKB">P11541</external_references>
                </sequence>
                <ec_number>3.1.4.35</ec_number>
            </protein_or_peptide>
            <protein_or_peptide macromolecule_id="3">
                <name>Retinal rod rhodopsin-sensitive cGMP 3',5'-cyclic phosphodiesterase subunit gamma</name>
                <natural_source database="NCBI">
                    <organism ncbi="9913">Bos taurus</organism>
                    <organ>Eye</organ>
                    <tissue>Retina</tissue>
                </natural_source>
                <molecular_weight>
                    <theoretical units="MDa">0.009684228999999999</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="9913">Bos taurus</recombinant_organism>
                </recombinant_expression>
                <enantiomer>LEVO</enantiomer>
                <sequence>
                    <string>MNLEPPKAEIRSATRVMGGPVTPRKGPPKFKQRQTRQFKSKPPKKGVQGFGDDIPGMEGLGTDITVICPWEAFNHLELHE
LAQYGII</string>
                    <external_references type="UNIPROTKB">P04972</external_references>
                </sequence>
                <ec_number>3.1.4.35</ec_number>
            </protein_or_peptide>
            <ligand macromolecule_id="4">
                <name>ZINC ION</name>
                <molecular_weight>
                    <theoretical units="MDa">6.5409e-05</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <formula>ZN</formula>
            </ligand>
            <ligand macromolecule_id="5">
                <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="6">
                <name>GUANOSINE-3',5'-MONOPHOSPHATE</name>
                <molecular_weight>
                    <theoretical units="MDa">0.00034520499999999996</theoretical>
                </molecular_weight>
                <number_of_copies>2</number_of_copies>
                <formula>35G</formula>
            </ligand>
        </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>7.5</ph>
                    </buffer>
                    <grid>
                        <model>Quantifoil R2/2</model>
                        <material>COPPER</material>
                    </grid>
                    <vitrification>
                        <cryogen_name>ETHANE</cryogen_name>
                    </vitrification>
                </single_particle_preparation>
            </specimen_preparation_list>
            <microscopy_list>
                <single_particle_microscopy microscopy_id="1">
                    <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>
                    <image_recording_list>
                        <image_recording image_recording_id="1">
                            <film_or_detector_model>GATAN K2 SUMMIT (4k x 4k)</film_or_detector_model>
                            <detector_mode>SUPER-RESOLUTION</detector_mode>
                            <average_electron_dose_per_image units="e/Å^2">80.0</average_electron_dose_per_image>
                        </image_recording>
                    </image_recording_list>
                </single_particle_microscopy>
            </microscopy_list>
            <singleparticle_processing image_processing_id="1">
                <image_recording_id>1</image_recording_id>
                <ctf_correction>
                    <type>NONE</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">3.4</resolution>
                    <resolution_method>FSC 0.143 CUT-OFF</resolution_method>
                    <number_images_used>43597</number_images_used>
                </final_reconstruction>
                <initial_angle_assignment>
                    <type>ANGULAR RECONSTITUTION</type>
                </initial_angle_assignment>
                <final_angle_assignment>
                    <type>ANGULAR RECONSTITUTION</type>
                </final_angle_assignment>
            </singleparticle_processing>
        </structure_determination>
    </structure_determination_list>
    <map format="CCP4" size_kbytes="28312">
        <file>emd_9297.map.gz</file>
        <symmetry>
            <space_group>1</space_group>
        </symmetry>
        <data_type>IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)</data_type>
        <dimensions>
            <col>192</col>
            <row>192</row>
            <sec>192</sec>
        </dimensions>
        <origin>
            <col>84</col>
            <row>84</row>
            <sec>84</sec>
        </origin>
        <spacing>
            <x>192</x>
            <y>192</y>
            <z>192</z>
        </spacing>
        <cell>
            <a units="Å">203.13599</a>
            <b units="Å">203.13599</b>
            <c units="Å">203.13599</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>-0.5842323</minimum>
            <maximum>32.156455999999999</maximum>
            <average>0.15703212</average>
            <std>1.3413881</std>
        </statistics>
        <pixel_spacing>
            <x units="Å">1.058</x>
            <y units="Å">1.058</y>
            <z units="Å">1.058</z>
        </pixel_spacing>
        <contour_list>
            <contour primary="true">
                <level>1.0</level>
                <source>AUTHOR</source>
            </contour>
        </contour_list>
        <label>::::EMDATABANK.org::::EMD-9297::::</label>
        <annotation_details>Cryo-EM structure of phosphodiesterase 6, primary map</annotation_details>
    </map>
    <interpretation>
        <segmentation_list>
            <segmentation>
                <file>emd_9297_msk_1.map</file>
            </segmentation>
        </segmentation_list>
    </interpretation>
</emd>
