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- PDB-6bnv: CryoEM structure of MyosinVI-actin complex in the rigor (nucleoti... -

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Database: PDB / ID: 6bnv
TitleCryoEM structure of MyosinVI-actin complex in the rigor (nucleotide-free) state, backbone-averaged with side chains truncated to alanine
  • Actin, alpha skeletal muscle
  • Calmodulin
  • Unconventional myosin-VI
KeywordsCONTRACTILE PROTEIN / Cytoskeleton / Filament / complex
Function / homologyStimuli-sensing channels / Myosin S1 fragment, N-terminal / Actin / Calmodulin / Kinesin motor domain superfamily / Class VI myosin, motor domain / Myosin VI, cargo binding domain / Phase 0 - rapid depolarisation / VEGFR2 mediated vascular permeability / P-loop containing nucleoside triphosphate hydrolase ...Stimuli-sensing channels / Myosin S1 fragment, N-terminal / Actin / Calmodulin / Kinesin motor domain superfamily / Class VI myosin, motor domain / Myosin VI, cargo binding domain / Phase 0 - rapid depolarisation / VEGFR2 mediated vascular permeability / P-loop containing nucleoside triphosphate hydrolase / Actin/actin-like conserved site / EF-Hand 1, calcium-binding site / EF-hand domain pair / Myosin, N-terminal, SH3-like / EF-hand domain pair / Actin, conserved site / Actin family / Activation of Ca-permeable Kainate Receptor / EF-hand domain / Myosin head, motor domain / Smooth Muscle Contraction / Ca2+ pathway / Reduction of cytosolic Ca++ levels / Sodium/Calcium exchangers / CREB phosphorylation through the activation of CaMKK / FCERI mediated Ca+2 mobilization / Ras activation upon Ca2+ influx through NMDA receptor / Myosin head (motor domain) / Ion homeostasis / Activation of CaMK IV / Protein methylation / Inactivation, recovery and regulation of the phototransduction cascade / eNOS activation / Synthesis of IP3 and IP4 in the cytosol / PKA activation / Tetrahydrobiopterin (BH4) synthesis, recycling, salvage and regulation / Platelet degranulation / Trafficking of AMPA receptors / Cam-PDE 1 activation / Gap junction degradation / Calmodulin induced events / Ion transport by P-type ATPases / Glycogen breakdown (glycogenolysis) / Myosin VI cargo binding domain / RAF/MAP kinase cascade / RHO GTPases activate PAKs / RHO GTPases activate IQGAPs / CaMK IV-mediated phosphorylation of CREB / Myosin N-terminal SH3-like domain profile. / Myosin motor domain profile. / EF-hand calcium-binding domain profile. / Actins and actin-related proteins signature. / Actins signature 2. / Actins signature 1. / CLEC7A (Dectin-1) induces NFAT activation / EF-hand calcium-binding domain. / CREB phosphorylation through the activation of CaMKII / CH domain binding / regulation of secretion / RNA polymerase II, holoenzyme / actin filament-based movement / clathrin-coated endocytic vesicle / positive regulation of actin-dependent ATPase activity / myosin complex / mesenchyme migration / myosin binding / tropomyosin binding / N-terminal myristoylation domain binding / positive regulation by host of symbiont cAMP-mediated signal transduction / myosin heavy chain binding / troponin I binding / skeletal muscle thin filament assembly / striated muscle thin filament / protein phosphatase activator activity / adenylate cyclase activator activity / positive regulation of ryanodine-sensitive calcium-release channel activity / actin filament bundle / positive regulation of cyclic-nucleotide phosphodiesterase activity / filamentous actin / catalytic complex / adenylate cyclase binding / detection of calcium ion / actin monomer binding / skeletal muscle fiber development / DNA damage response, signal transduction by p53 class mediator / negative regulation of ryanodine-sensitive calcium-release channel activity / regulation of cardiac muscle contraction / voltage-gated potassium channel complex / actin filament bundle assembly / calcium channel inhibitor activity / skeletal muscle myofibril / motor activity / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / positive regulation of phosphoprotein phosphatase activity / stress fiber / calcium channel complex / ADP binding / sarcomere / titin binding / actin filament polymerization
Function and homology information
Specimen sourceSus scrofa (pig)
Gallus gallus (chicken)
Oryctolagus cuniculus (rabbit)
MethodELECTRON MICROSCOPY / helical reconstruction / cryo EM / 4.6 Å resolution
AuthorsGurel, P.S. / Alushin, G.A.
CitationJournal: Nat Nanotechnol / Year: 2018
Title: Controllable molecular motors engineered from myosin and RNA.
Authors: Tosan Omabegho / Pinar S Gurel / Clarence Y Cheng / Laura Y Kim / Paul V Ruijgrok / Rhiju Das / Gregory M Alushin / Zev Bryant
Validation Report
SummaryFull reportAbout validation report
DateDeposition: Nov 17, 2017 / Release: Jan 10, 2018
RevisionDateData content typeGroupCategoryItemProviderType
1.0Jan 10, 2018Structure modelrepositoryInitial release
1.1Jan 17, 2018Structure modelAuthor supporting evidencepdbx_audit_support_pdbx_audit_support.funding_organization

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Deposited unit
I: Unconventional myosin-VI
J: Unconventional myosin-VI
K: Unconventional myosin-VI
L: Unconventional myosin-VI
M: Unconventional myosin-VI
N: Unconventional myosin-VI
A: Actin, alpha skeletal muscle
B: Actin, alpha skeletal muscle
C: Actin, alpha skeletal muscle
D: Actin, alpha skeletal muscle
E: Actin, alpha skeletal muscle
F: Actin, alpha skeletal muscle
G: Actin, alpha skeletal muscle
H: Actin, alpha skeletal muscle
O: Calmodulin
P: Calmodulin
Q: Calmodulin
R: Calmodulin
S: Calmodulin
T: Calmodulin

Theoretical massNumber of molelcules
Total (without water)990,16220

TypeNameSymmetry operationNumber
identity operation1_5551


#1: Protein/peptide
Unconventional myosin-VI

Mass: 93207.297 Da / Num. of mol.: 6 / Source: (gene. exp.) Sus scrofa (pig) / Tissue: skeletal muscle / Gene: MYO6 / Plasmid name: pBiex1 / Cell line (production host): sf9 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: F1RQI7, UniProt: Q29122*PLUS
#2: Protein/peptide
Actin, alpha skeletal muscle / / Alpha-actin-1

Mass: 41560.266 Da / Num. of mol.: 8 / Source: (natural) Oryctolagus cuniculus (rabbit) / Tissue: skeletal muscle / References: UniProt: P68135
#3: Protein/peptide
Calmodulin / / CaM

Mass: 16406.004 Da / Num. of mol.: 6 / Source: (gene. exp.) Gallus gallus (chicken) / Gene: CALM, CAM, RCJMB04_24e7 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P62149

Experimental details


EM experimentAggregation state: FILAMENT / Reconstruction method: helical reconstruction

Sample preparation

IDNameTypeEntity IDParent IDSource
1myosin VI-actin in the rigor (nucleotide-free) stateCOMPLEX1, 2, 30MULTIPLE SOURCES
Molecular weightValue: 0.139 MDa / Experimental value: NO
Source (natural)
IDEntity assembly IDNcbi tax IDOrganism
129823Sus scrofa (pig)
239986Oryctolagus cuniculus (rabbit)
349031Gallus gallus (chicken)
Source (recombinant)
IDEntity assembly IDNcbi tax IDOrganism
127108Spodoptera frugiperda (fall armyworm)
247108Spodoptera frugiperda (fall armyworm)
Buffer solutionDetails: Buffer was filtered through 0.44 um filter and degassed.
pH: 7.5
Buffer component
IDConc.NameFormulaBuffer ID
150 mMpotassium chlorideKCl1
21 mMmagnesium chlorideMgCl21
31 mMEGTAC14H24N2O101
410 mMimidazoleC3H4N21
52 mMTris hydrochlorideC4H11NO31
60.5 mMdithiothreitolC4H10O2S21
7200 mMadenosine triphosphateC10H16N5O13P31
80.01 %sodium azideNaN31
910 U/mLapyraseapyrase1
SpecimenConc.: 0.045 mg/ml
Details: 0.45 mg/mL myosin VI was added to 0.025 mg/mL actin
Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 200 / Grid type: C-flat-1.2/1.3
VitrificationInstrument: LEICA EM GP / Cryogen name: ETHANE / Humidity: 95 % / Chamber temperature: 298 kelvins
Details: Sample was applied to a glow-discharged holey carbon grid. 3 uL actin was incubated for 60 seconds. 3 uL of myosin VI was added and incubated for 60 seconds. 3 uL solution was removed. An additional 3 uL of myosin VI was applied. After 60 seconds, 3 uL solution was removed, and the grid was blotted for 3 seconds from the backside with filter paper.

Electron microscopy imaging

MicroscopyMicroscope model: FEI TECNAI 20
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal magnification: 29000 / Nominal defocus max: 3000 nm / Nominal defocus min: 1500 nm / Cs: 2 mm / C2 aperture diameter: 100 mm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN
Image recordingAverage exposure time: 0.25 sec. / Electron dose: 1.5 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Number of grids imaged: 3 / Number of real images: 778
Image scansSampling size: 5 microns / Width: 3838 / Height: 3711 / Movie frames/image: 24 / Used frames/image: 1-24


EM software
1Appionparticle selection
2Leginonimage acquisition
4CTFFIND3CTF correction
5FREALIGN9.11CTF correction
8DireXmodel fitting
9MDFFmodel fitting
10NAMDmodel fitting
12EMAN2initial Euler assignment
13SPARXinitial Euler assignment
14FREALIGN9.11final Euler assignment
16FREALIGN9.113D reconstruction
17MDFFmodel refinement
18PHENIXmodel refinement
Helical symmertyAngular rotation/subunit: -166.73 deg. / Axial rise/subunit: 28.06 Å / Axial symmetry: C1
3D reconstructionResolution: 4.6 Å / Resolution method: FSC 0.143 CUT-OFF / Number of particles: 56116 / Algorithm: FOURIER SPACE / Number of class averages: 1 / Symmetry type: HELICAL
Atomic model buildingDetails: 2BKI chain B was grafted onto Chains A-F of 6BNP, then assembled by rigid body docking into the 7.5 A low pass-filtered density map, followed by flexible fitting with DireX. The resulting model was subjected to MDFF using the 7.5 A low pass-filtered density map. Atomistic models were backbone-averaged in Phenix and side chains were truncated to alanine. This treatment has resulted in the errors noted in the associated caveats.
Overall b value: 150 / Ref protocol: FLEXIBLE FIT / Ref space: REAL

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