<emd emdb_id="EMD-1746" version="3.0.1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="https://github.com/emdb-empiar/emdb-schemas/blob/master/v3/v3_0_1_1/emdb_relaxed.xsd">
    <admin>
        <current_status>
            <code>REL</code>
            <processing_site>PDBe</processing_site>
        </current_status>
        <sites>
            <deposition>PDBe</deposition>
            <last_processing>PDBe</last_processing>
        </sites>
        <key_dates>
            <deposition>2010-06-10</deposition>
            <header_release>2010-06-16</header_release>
            <map_release>2011-06-17</map_release>
            <update>2016-04-13</update>
        </key_dates>
        <title>P22 F170L C1 polyheads</title>
        <authors_list>
            <author>Parent KN</author>
            <author>Sinkovits RS</author>
            <author>Suhanovsky MM</author>
            <author>Teschke CM</author>
            <author>Egelman EH</author>
            <author>Baker TS</author>
        </authors_list>
        <keywords>cryo-TEM,image reconstruction,helical reconstruction,bacteriophage P22,virus assembly,coat protein</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="true">
                    <author order="1">Parent KN</author>
                    <author order="2">Sinkovits RS</author>
                    <author order="3">Suhanovsky MM</author>
                    <author order="4">Teschke CM</author>
                    <author order="5">Egelman EH</author>
                    <author order="6">Baker TS</author>
                    <title>Cryo-reconstructions of P22 polyheads suggest that phage assembly is nucleated by trimeric interactions among coat proteins.</title>
                    <journal>PHYS.BIOL.</journal>
                    <volume>7</volume>
                    <first_page>045004</first_page>
                    <last_page>045004</last_page>
                    <year>2010</year>
                    <external_references type="PUBMED">21149969</external_references>
                    <external_references type="DOI">doi:10.1088/1478-3975/7/4/045004</external_references>
                </journal_citation>
            </primary_citation>
        </citation_list>
    </crossreferences>
    <sample>
        <name>F170L coat protein in C1 helical lattice</name>
        <supramolecule_list>
            <sample_supramolecule supramolecule_id="1000">
                <name>F170L coat protein in C1 helical lattice</name>
                <details>This sample was generated by concentrating coat protein monomers. The asymmetric unit is a hexon.</details>
                <number_unique_components>1</number_unique_components>
            </sample_supramolecule>
            <virus_supramolecule supramolecule_id="1">
                <name synonym="Coat protein">Enterobacteria phage P22</name>
                <sci_species_name ncbi="10754">Enterobacteria phage P22</sci_species_name>
                <natural_host database="NCBI">
                    <organism ncbi="90371">Salmonella enterica subsp. enterica serovar Typhimurium</organism>
                    <synonym_organism>BACTERIA(EUBACTERIA)</synonym_organism>
                </natural_host>
                <host_system database="NCBI" />
                <molecular_weight>
                    <experimental units="MDa">47</experimental>
                    <theoretical units="MDa">47</theoretical>
                </molecular_weight>
                <virus_type>OTHER</virus_type>
                <virus_isolate>STRAIN</virus_isolate>
                <virus_enveloped>false</virus_enveloped>
                <virus_empty>true</virus_empty>
                <syn_species_name>Coat protein</syn_species_name>
            </virus_supramolecule>
        </supramolecule_list>
    </sample>
    <structure_determination_list>
        <structure_determination structure_determination_id="1">
            <method>helical</method>
            <aggregation_state>filament</aggregation_state>
            <specimen_preparation_list>
                <helical_preparation preparation_id="1">
                    <concentration units="mg/mL">35</concentration>
                    <buffer>
                        <ph>7.6</ph>
                        <details>20 mM sodium phosphate</details>
                    </buffer>
                    <grid>
                        <details>Lacey-carbon</details>
                    </grid>
                    <vitrification>
                        <cryogen_name>ETHANE</cryogen_name>
                        <chamber_humidity units="percentage">100</chamber_humidity>
                        <chamber_temperature units="K">89</chamber_temperature>
                        <instrument>HOMEMADE PLUNGER</instrument>
                        <details>Vitrification instrument: Manual plunge-freezer</details>
                        <method>Blot for 5 seconds before freezing</method>
                    </vitrification>
                </helical_preparation>
            </specimen_preparation_list>
            <microscopy_list>
                <helical_microscopy microscopy_id="1">
                    <microscope>FEI POLARA 300</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">2.3</nominal_cs>
                    <nominal_defocus_min units="&#181;m">1.14</nominal_defocus_min>
                    <nominal_defocus_max units="&#181;m">3.39</nominal_defocus_max>
                    <nominal_magnification>79666.0</nominal_magnification>
                    <calibrated_magnification>79666.0</calibrated_magnification>
                    <specimen_holder_model>GATAN LIQUID NITROGEN</specimen_holder_model>
                    <temperature>
                        <temperature_min units="K">90</temperature_min>
                        <temperature_max units="K">90</temperature_max>
                        <temperature_average units="K">90</temperature_average>
                    </temperature>
                    <alignment_procedure>
                        <legacy>
                            <astigmatism>At working magnification</astigmatism>
                        </legacy>
                    </alignment_procedure>
                    <date>2008-10-10</date>
                    <image_recording_list>
                        <image_recording>
                            <film_or_detector_model category="CCD">GENERIC GATAN (4k x 4k)</film_or_detector_model>
                            <digitization_details>
                                <sampling_interval units="&#181;m">1.883</sampling_interval>
                            </digitization_details>
                            <number_real_images>1141</number_real_images>
                            <average_electron_dose_per_image units="e/&#8491;^2">19</average_electron_dose_per_image>
                            <od_range>1.5</od_range>
                            <bits_per_pixel>16.</bits_per_pixel>
                        </image_recording>
                    </image_recording_list>
                    <specimen_holder>Polara Multi Specimen Holder</specimen_holder>
                </helical_microscopy>
            </microscopy_list>
            <helical_processing image_processing_id="1">
                <details>This reconstruction was done with the iterative helical real space reconstruction method</details>
                <final_reconstruction>
                    <applied_symmetry>
                        <helical_parameters>
                            <delta_z units="&#8491;">10.5</delta_z>
                            <delta_phi units="deg">37.4</delta_phi>
                            <axial_symmetry>C1</axial_symmetry>
                        </helical_parameters>
                    </applied_symmetry>
                    <algorithm>OTHER</algorithm>
                    <resolution res_type="BY AUTHOR" units="&#8491;">13.0</resolution>
                    <resolution_method>OTHER</resolution_method>
                    <software_list>
                        <software>
                            <name>IHRSR</name>
                        </software>
                    </software_list>
                </final_reconstruction>
                <ctf_correction>
                    <details>ROBEM</details>
                </ctf_correction>
            </helical_processing>
        </structure_determination>
    </structure_determination_list>
    <map format="CCP4" size_kbytes="182251">
        <file>emd_1746.map.gz</file>
        <symmetry>
            <space_group>1</space_group>
        </symmetry>
        <data_type>IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)</data_type>
        <dimensions>
            <col>360</col>
            <row>360</row>
            <sec>360</sec>
        </dimensions>
        <origin>
            <col>0</col>
            <row>0</row>
            <sec>0</sec>
        </origin>
        <spacing>
            <x>360</x>
            <y>360</y>
            <z>360</z>
        </spacing>
        <cell>
            <a units="&#8491;">677.88</a>
            <b units="&#8491;">677.88</b>
            <c units="&#8491;">677.88</c>
            <alpha units="deg">90</alpha>
            <beta units="deg">90</beta>
            <gamma units="deg">90</gamma>
        </cell>
        <axis_order>
            <fast>X</fast>
            <medium>Y</medium>
            <slow>Z</slow>
        </axis_order>
        <statistics>
            <minimum>-0.537483</minimum>
            <maximum>0.624498</maximum>
            <average>0.00909644</average>
            <std>0.105518</std>
        </statistics>
        <pixel_spacing>
            <x units="&#8491;">1.883</x>
            <y units="&#8491;">1.883</y>
            <z units="&#8491;">1.883</z>
        </pixel_spacing>
        <contour_list>
            <contour primary="true">
                <level>0.125</level>
                <source>AUTHOR</source>
            </contour>
        </contour_list>
        <annotation_details>This is a helical reconstruction of a P22 polyhead with F170L coat protein with C1 symmetry</annotation_details>
        <details>::::EMDATABANK.org::::EMD-1746::::</details>
    </map>
</emd>