<?xml version="1.0" encoding="UTF-8"?>
<emd emdb_id="EMD-6302" version="3.0.1.9">
    <admin>
        <status_history_list>
            <status status_id="1">
                <code>REL</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>2015-03-13</deposition>
            <header_release>2015-05-06</header_release>
            <map_release>2016-03-23</map_release>
            <obsolete>2016-03-23</obsolete>
            <update>2016-03-23</update>
        </key_dates>
        <title>The cryo-EM structure of Meiothermus taiwanensis Lon protease without ATP and Mg2+</title>
        <authors_list>
            <author>Su SC</author>
            <author>Chang YC</author>
            <author>Chang CI</author>
        </authors_list>
        <keywords>ATP-dependent protease, sequestered degradation chamber, AAA+ domain, protease domain</keywords>
    </admin>
    <crossreferences>
        <citation_list>
            <primary_citation>
                <journal_citation published="false">
                    <author order="1">Su SC</author>
                    <author order="2">Chang YC</author>
                    <author order="3">Chang CI</author>
                    <title>Structural modulators control the assembly and activity of the Lon AAA+ protease</title>
                    <journal>To Be Published</journal>
                </journal_citation>
            </primary_citation>
        </citation_list>
    </crossreferences>
    <sample>
        <name>Meiothermus taiwanensis LonA protease</name>
        <supramolecule_list>
            <sample_supramolecule supramolecule_id="1000">
                <name>Meiothermus taiwanensis LonA protease</name>
                <oligomeric_state>One homotetramer of MtaLonA in apo form</oligomeric_state>
                <number_unique_components>1</number_unique_components>
                <molecular_weight>
                    <experimental units="MDa">0.54</experimental>
                    <theoretical units="MDa">0.54</theoretical>
                    <method>Sedimentation</method>
                </molecular_weight>
            </sample_supramolecule>
        </supramolecule_list>
        <macromolecule_list>
            <protein_or_peptide macromolecule_id="1">
                <name synonym="MtaLonA">Meiothermus taiwanensis LonA protease</name>
                <natural_source database="NCBI">
                    <organism ncbi="172827">Meiothermus taiwanensis</organism>
                    <synonym_organism>Meiothermus taiwanensis</synonym_organism>
                </natural_source>
                <molecular_weight>
                    <experimental units="MDa">0.54</experimental>
                    <theoretical units="MDa">0.54</theoretical>
                </molecular_weight>
                <oligomeric_state>Tetramer</oligomeric_state>
                <recombinant_exp_flag>true</recombinant_exp_flag>
                <recombinant_expression database="NCBI">
                    <recombinant_organism ncbi="562">Escherichia coli</recombinant_organism>
                    <recombinant_plasmid>PET21a</recombinant_plasmid>
                </recombinant_expression>
                <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">
                    <concentration units="mg/mL">0.12</concentration>
                    <buffer>
                        <ph>8.0</ph>
                        <details>20mM Tris-HCl, 100mM NaCl, 1mM DTT</details>
                    </buffer>
                    <staining>
                        <type>NEGATIVE</type>
                        <details>Grids with adsorbed protein floated on 2% w/v uranyl acetate for 60 seconds.</details>
                    </staining>
                    <grid>
                        <details>200 mesh gold grid with thin carbon support, glow discharged in amylamine atmosphere</details>
                    </grid>
                    <vitrification>
                        <cryogen_name>ETHANE</cryogen_name>
                        <chamber_humidity units="percentage">100</chamber_humidity>
                        <instrument>FEI VITROBOT MARK IV</instrument>
                        <method>1. wait for 10 seconds before blot
2. Blot for 3 seconds before plunging</method>
                    </vitrification>
                </single_particle_preparation>
            </specimen_preparation_list>
            <microscopy_list>
                <single_particle_microscopy microscopy_id="1">
                    <microscope>FEI TECNAI F20</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</nominal_cs>
                    <nominal_defocus_min units="µm">1.0</nominal_defocus_min>
                    <nominal_defocus_max units="µm">5.0</nominal_defocus_max>
                    <nominal_magnification>62000.0</nominal_magnification>
                    <calibrated_magnification>80000.0</calibrated_magnification>
                    <specimen_holder_model>GATAN LIQUID NITROGEN</specimen_holder_model>
                    <alignment_procedure>
                        <legacy>
                            <astigmatism>Objective lens astigmatism was corrected at 100,000 times magnification</astigmatism>
                        </legacy>
                    </alignment_procedure>
                    <date>1995-10-09</date>
                    <image_recording_list>
                        <image_recording>
                            <film_or_detector_model category="CCD">GATAN ULTRASCAN 4000 (4k x 4k)</film_or_detector_model>
                            <number_real_images>122</number_real_images>
                            <average_electron_dose_per_image units="e/Å^2">20</average_electron_dose_per_image>
                        </image_recording>
                    </image_recording_list>
                </single_particle_microscopy>
            </microscopy_list>
            <singleparticle_processing image_processing_id="1">
                <details>The particle images were interactively selected using EMAN Boxer program</details>
                <ctf_correction>
                    <details>Each particle</details>
                </ctf_correction>
                <final_reconstruction>
                    <resolution units="Å" res_type="BY AUTHOR">15.1</resolution>
                    <resolution_method>OTHER</resolution_method>
                    <software_list>
                        <software>
                            <name>EMAN2</name>
                        </software>
                    </software_list>
                    <number_images_used>14790</number_images_used>
                </final_reconstruction>
                <final_two_d_classification>
                    <number_classes>80</number_classes>
                </final_two_d_classification>
            </singleparticle_processing>
        </structure_determination>
    </structure_determination_list>
    <map format="CCP4" size_kbytes="6751">
        <file>emd_6302.map.gz</file>
        <symmetry>
            <space_group>1</space_group>
        </symmetry>
        <data_type>IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)</data_type>
        <dimensions>
            <col>120</col>
            <row>120</row>
            <sec>120</sec>
        </dimensions>
        <origin>
            <col>-60</col>
            <row>-60</row>
            <sec>-60</sec>
        </origin>
        <spacing>
            <x>120</x>
            <y>120</y>
            <z>120</z>
        </spacing>
        <cell>
            <a units="Å">198.0</a>
            <b units="Å">198.0</b>
            <c units="Å">198.0</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>-65.58416748</minimum>
            <maximum>240.97012329</maximum>
            <average>10.53799057</average>
            <std>35.73754883</std>
        </statistics>
        <pixel_spacing>
            <x units="Å">1.65</x>
            <y units="Å">1.65</y>
            <z units="Å">1.65</z>
        </pixel_spacing>
        <contour_list>
            <contour primary="true">
                <level>170.0</level>
                <source>AUTHOR</source>
            </contour>
        </contour_list>
        <annotation_details>Reconstruction of Meiothermus taiwanensis LonA protease</annotation_details>
        <details>::::EMDATABANK.org::::EMD-6302::::</details>
    </map>
    <interpretation>
        <figure_list>
            <figure>
                <file>emd_6302.tiff</file>
            </figure>
        </figure_list>
    </interpretation>
</emd>
