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Yorodumi- EMDB-28082: Helical reconstruction of the human cardiac actin-tropomyosin-myo... -
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-Basic information
Entry | Database: EMDB / ID: EMD-28082 | |||||||||
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Title | Helical reconstruction of the human cardiac actin-tropomyosin-myosin complex in complex with ADP-Mg2+ | |||||||||
Map data | Primary map used for model building of the helical reconstruction of the actin-tropomyosin-B-cardiac myosin II complex with ADP-Mg2 bound. | |||||||||
Sample |
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Function / homology | Function and homology information positive regulation of heart rate by epinephrine / muscle thin filament tropomyosin / regulation of slow-twitch skeletal muscle fiber contraction / RHOB GTPase cycle / Striated Muscle Contraction / regulation of the force of skeletal muscle contraction / RHOA GTPase cycle / actin-myosin filament sliding / muscle myosin complex / bleb ...positive regulation of heart rate by epinephrine / muscle thin filament tropomyosin / regulation of slow-twitch skeletal muscle fiber contraction / RHOB GTPase cycle / Striated Muscle Contraction / regulation of the force of skeletal muscle contraction / RHOA GTPase cycle / actin-myosin filament sliding / muscle myosin complex / bleb / negative regulation of vascular associated smooth muscle cell migration / regulation of muscle contraction / muscle filament sliding / regulation of the force of heart contraction / transition between fast and slow fiber / myosin filament / ruffle organization / myosin II complex / adult heart development / cardiac muscle hypertrophy in response to stress / positive regulation of ATP-dependent activity / Striated Muscle Contraction / myosin complex / regulation of heart contraction / sarcomere organization / structural constituent of muscle / microfilament motor activity / ventricular cardiac muscle tissue morphogenesis / myosin binding / myofibril / heart contraction / mesenchyme migration / negative regulation of vascular associated smooth muscle cell proliferation / skeletal muscle contraction / positive regulation of cell adhesion / striated muscle contraction / Smooth Muscle Contraction / ATP metabolic process / stress fiber / cardiac muscle contraction / positive regulation of stress fiber assembly / cytoskeleton organization / cytoskeletal protein binding / regulation of heart rate / sarcomere / negative regulation of cell migration / muscle contraction / filopodium / actin filament organization / actin filament / wound healing / structural constituent of cytoskeleton / ruffle membrane / Z disc / cellular response to reactive oxygen species / actin filament binding / actin cytoskeleton / lamellipodium / cell body / actin binding / regulation of cell shape / cytoskeleton / calmodulin binding / protein heterodimerization activity / positive regulation of gene expression / protein homodimerization activity / ATP binding / identical protein binding / cytosol / cytoplasm Similarity search - Function | |||||||||
Biological species | Sus scrofa (pig) / Homo sapiens (human) / pig (pig) | |||||||||
Method | helical reconstruction / cryo EM / Resolution: 3.3 Å | |||||||||
Authors | Doran MH / Lehman W / Rynkiewicz MJ | |||||||||
Funding support | United States, 1 items
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Citation | Journal: J Gen Physiol / Year: 2023 Title: Conformational changes linked to ADP release from human cardiac myosin bound to actin-tropomyosin. Authors: Matthew H Doran / Michael J Rynkiewicz / David Rasicci / Skylar M L Bodt / Meaghan E Barry / Esther Bullitt / Christopher M Yengo / Jeffrey R Moore / William Lehman / Abstract: Following binding to the thin filament, β-cardiac myosin couples ATP-hydrolysis to conformational rearrangements in the myosin motor that drive myofilament sliding and cardiac ventricular ...Following binding to the thin filament, β-cardiac myosin couples ATP-hydrolysis to conformational rearrangements in the myosin motor that drive myofilament sliding and cardiac ventricular contraction. However, key features of the cardiac-specific actin-myosin interaction remain uncertain, including the structural effect of ADP release from myosin, which is rate-limiting during force generation. In fact, ADP release slows under experimental load or in the intact heart due to the afterload, thereby adjusting cardiac muscle power output to meet physiological demands. To further elucidate the structural basis of this fundamental process, we used a combination of cryo-EM reconstruction methodologies to determine structures of the human cardiac actin-myosin-tropomyosin filament complex at better than 3.4 Å-resolution in the presence and in the absence of Mg2+·ADP. Focused refinements of the myosin motor head and its essential light chains in these reconstructions reveal that small changes in the nucleotide-binding site are coupled to significant rigid body movements of the myosin converter domain and a 16-degree lever arm swing. Our structures provide a mechanistic framework to understand the effect of ADP binding and release on human cardiac β-myosin, and offer insights into the force-sensing mechanism displayed by the cardiac myosin motor. | |||||||||
History |
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-Structure visualization
Supplemental images |
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-Downloads & links
-EMDB archive
Map data | emd_28082.map.gz | 181.8 MB | EMDB map data format | |
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Header (meta data) | emd-28082-v30.xml emd-28082.xml | 24.6 KB 24.6 KB | Display Display | EMDB header |
FSC (resolution estimation) | emd_28082_fsc.xml | 15.6 KB | Display | FSC data file |
Images | emd_28082.png | 69.2 KB | ||
Masks | emd_28082_msk_1.map | 325 MB | Mask map | |
Others | emd_28082_additional_1.map.gz emd_28082_half_map_1.map.gz emd_28082_half_map_2.map.gz | 297.8 MB 259.4 MB 259.4 MB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-28082 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-28082 | HTTPS FTP |
-Related structure data
Related structure data | 8efhMC 8efdC 8efeC M: atomic model generated by this map C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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Related items in Molecule of the Month |
-Map
File | Download / File: emd_28082.map.gz / Format: CCP4 / Size: 325 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||
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Annotation | Primary map used for model building of the helical reconstruction of the actin-tropomyosin-B-cardiac myosin II complex with ADP-Mg2 bound. | ||||||||||||||||||||
Voxel size | X=Y=Z: 1.078 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Mask #1
File | emd_28082_msk_1.map | ||||||||||||
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Density Histograms |
-Additional map: Non-locally-filtered map associated with primary map.
File | emd_28082_additional_1.map | ||||||||||||
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Annotation | Non-locally-filtered map associated with primary map. | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: Half map 1.
File | emd_28082_half_map_1.map | ||||||||||||
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Annotation | Half map 1. | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: Half map 2.
File | emd_28082_half_map_2.map | ||||||||||||
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Annotation | Half map 2. | ||||||||||||
Projections & Slices |
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Density Histograms |
-Sample components
-Entire : Human cardiac actin-tropomyosin-beta-myosin II complex bound to A...
Entire | Name: Human cardiac actin-tropomyosin-beta-myosin II complex bound to ADPMg2+. |
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Components |
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-Supramolecule #1: Human cardiac actin-tropomyosin-beta-myosin II complex bound to A...
Supramolecule | Name: Human cardiac actin-tropomyosin-beta-myosin II complex bound to ADPMg2+. type: complex / ID: 1 / Chimera: Yes / Parent: 0 / Macromolecule list: #1-#3 Details: Cardiac actomyosin-tropomyosin complex with ADPMg2+ bound to the myosin motor head. |
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-Supramolecule #2: Cardiac F-actin complex
Supramolecule | Name: Cardiac F-actin complex / type: complex / ID: 2 / Chimera: Yes / Parent: 1 / Macromolecule list: #2 / Details: F-actin forms the backbone of the complex |
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Source (natural) | Organism: Sus scrofa (pig) |
-Supramolecule #3: Human beta-cardiac myosin II
Supramolecule | Name: Human beta-cardiac myosin II / type: complex / ID: 3 / Chimera: Yes / Parent: 1 / Macromolecule list: #1 Details: The motor domain of the myosin saturates the actin filament. |
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Source (natural) | Organism: Homo sapiens (human) |
-Supramolecule #4: Human cardiac tropomyosin
Supramolecule | Name: Human cardiac tropomyosin / type: complex / ID: 4 / Chimera: Yes / Parent: 1 / Macromolecule list: #3 / Details: Tropomyosin wraps around the F-actin core. |
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Source (natural) | Organism: Homo sapiens (human) |
-Macromolecule #1: beta-cardiac myosin II
Macromolecule | Name: beta-cardiac myosin II / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: Homo sapiens (human) |
Molecular weight | Theoretical: 99.157695 KDa |
Recombinant expression | Organism: Mus musculus (house mouse) |
Sequence | String: MGDSEMAVFG AAAPYLRKSE KERLEAQTRP FDLKKDVFVP DDKQEFVKAK IVSREGGKVT AETEYGKTVT VKEDQVMQQN PPKFDKIED MAMLTFLHEP AVLYNLKDRY GSWMIYTYSG LFCVTVNPYK WLPVYTPEVV AAYRGKKRSE APPHIFSISD N AYQYMLTD ...String: MGDSEMAVFG AAAPYLRKSE KERLEAQTRP FDLKKDVFVP DDKQEFVKAK IVSREGGKVT AETEYGKTVT VKEDQVMQQN PPKFDKIED MAMLTFLHEP AVLYNLKDRY GSWMIYTYSG LFCVTVNPYK WLPVYTPEVV AAYRGKKRSE APPHIFSISD N AYQYMLTD RENQSILITG ESGAGKTVNT KRVIQYFAVI AAIGDRSKKD QSPGKGTLED QIIQANPALE AFGNAKTVRN DN SSRFGKF IRIHFGATGK LASADIETYL LEKSRVIFQL KAERDYHIFY QILSNKKPEL LDMLLITNNP YDYAFISQGE TTV ASIDDA EELMATDNAF DVLGFTSEEK NSMYKLTGAI MHFGNMKFKL KQREEQAEPD GTEEADKSAY LMGLNSADLL KGLC HPRVK VGNEYVTKGQ NVQQVIYATG ALAKAVYERM FNWMVTRINA TLETKQPRQY FIGVLDIAGF EIFDFNSFEQ LCINF TNEK LQQFFNHHMF VLEQEEYKKE GIEWTFIDFG MDLQACIDLI EKPMGIMSIL EEECMFPKAT DMTFKAKLFD NHLGKS ANF QKPRNIKGKP EAHFSLIHYA GIVDYNIIGW LQKNKDPLNE TVVGLYQKSS LKLLSTLFAN YAGADAPIEK GKGKAKK GS SFQTVSALHR ENLNKLMTNL RSTHPHFVRC IIPNETKSPG VMDNPLVMHQ LRCNGVLEGI RICRKGFPNR ILYGDFRQ R YRILNPAAIP EGQFIDSRKG AEKLLSSLDI DHNQYKFGHT KVFFKAGLLG LLEEMRDERL SRIITRIQAQ SRGVLARME YKKLLERRDS LLVIQWNIRA FMGVKNWPWM KLYFKIKPLL KSGLNDIFEA QKIEWHEDYK DDDDK |
-Macromolecule #2: Actin, alpha cardiac muscle 1
Macromolecule | Name: Actin, alpha cardiac muscle 1 / type: protein_or_peptide / ID: 2 / Number of copies: 5 / Enantiomer: LEVO |
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Source (natural) | Organism: pig (pig) |
Molecular weight | Theoretical: 42.064891 KDa |
Sequence | String: MCDDEETTAL VCDNGSGLVK AGFAGDDAPR AVFPSIVGRP RHQGVMVGMG QKDSYVGDEA QSKRGILTLK YPIEHGIITN WDDMEKIWH HTFYNELRVA PEEHPTLLTE APLNPKANRE KMTQIMFETF NVPAMYVAIQ AVLSLYASGR TTGIVLDSGD G VTHNVPIY ...String: MCDDEETTAL VCDNGSGLVK AGFAGDDAPR AVFPSIVGRP RHQGVMVGMG QKDSYVGDEA QSKRGILTLK YPIEHGIITN WDDMEKIWH HTFYNELRVA PEEHPTLLTE APLNPKANRE KMTQIMFETF NVPAMYVAIQ AVLSLYASGR TTGIVLDSGD G VTHNVPIY EGYALPHAIM RLDLAGRDLT DYLMKILTER GYSFVTTAER EIVRDIKEKL CYVALDFENE MATAASSSSL EK SYELPDG QVITIGNERF RCPETLFQPS FIGMESAGIH ETTYNSIMKC DIDIRKDLYA NNVLSGGTTM YPGIADRMQK EIT ALAPST MKIKIIAPPE RKYSVWIGGS ILASLSTFQQ MWISKQEYDE AGPSIVHRKC F |
-Macromolecule #3: Tropomyosin alpha-1 chain
Macromolecule | Name: Tropomyosin alpha-1 chain / type: protein_or_peptide / ID: 3 / Number of copies: 2 / Enantiomer: LEVO |
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Source (natural) | Organism: Homo sapiens (human) |
Molecular weight | Theoretical: 32.763621 KDa |
Recombinant expression | Organism: Escherichia coli (E. coli) |
Sequence | String: MDAIKKKMQM LKLDKENALD RAEQAEADKK AAEDRSKQLE DELVSLQKKL KGTEDELDKY SEALKDAQEK LELAEKKATD AEADVASLN RRIQLVEEEL DRAQERLATA LQKLEEAEKA ADESERGMKV IESRAQKDEE KMEIQEIQLK EAKHIAEDAD R KYEEVARK ...String: MDAIKKKMQM LKLDKENALD RAEQAEADKK AAEDRSKQLE DELVSLQKKL KGTEDELDKY SEALKDAQEK LELAEKKATD AEADVASLN RRIQLVEEEL DRAQERLATA LQKLEEAEKA ADESERGMKV IESRAQKDEE KMEIQEIQLK EAKHIAEDAD R KYEEVARK LVIIESDLER AEERAELSEG KCAELEEELK TVTNNLKSLE AQAEKYSQKE DRYEEEIKVL SDKLKEAETR AE FAERSVT KLEKSIDDLE DELYAQKLKY KAISEELDHA LNDMTSI |
-Macromolecule #4: MAGNESIUM ION
Macromolecule | Name: MAGNESIUM ION / type: ligand / ID: 4 / Number of copies: 6 / Formula: MG |
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Molecular weight | Theoretical: 24.305 Da |
-Macromolecule #5: ADENOSINE-5'-DIPHOSPHATE
Macromolecule | Name: ADENOSINE-5'-DIPHOSPHATE / type: ligand / ID: 5 / Number of copies: 6 / Formula: ADP |
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Molecular weight | Theoretical: 427.201 Da |
Chemical component information | ChemComp-ADP: |
-Experimental details
-Structure determination
Method | cryo EM |
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Processing | helical reconstruction |
Aggregation state | filament |
-Sample preparation
Concentration | 0.13 mg/mL |
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Buffer | pH: 7 |
Grid | Model: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 400 / Support film - Material: GOLD / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 30 sec. Details: 15 mA was used in the Pelco Easiglow glow discharge machine |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 283 K / Instrument: FEI VITROBOT MARK III |
-Electron microscopy
Microscope | TFS KRIOS |
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Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
Electron optics | Illumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.7 mm / Nominal defocus max: 3.0 µm / Nominal defocus min: 0.7000000000000001 µm / Nominal magnification: 80000 |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Image recording | Film or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 4 / Number real images: 3961 / Average exposure time: 3.12 sec. / Average electron dose: 53.7 e/Å2 |
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |