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- EMDB-26079: Apo CaKip3[2-436]-L2-mutant(HsKHC) in complex with a microtubule -
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Open data
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Basic information
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Title | Apo CaKip3[2-436]-L2-mutant(HsKHC) in complex with a microtubule | ||||||||||||
![]() | Primary map, locally refined on the central asymmetric unit | ||||||||||||
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![]() | Kip3 / kinesin / motility / microtubule / tubulin / MOTOR PROTEIN | ||||||||||||
Function / homology | ![]() cytoplasm organization / cytolytic granule membrane / mitotic spindle astral microtubule / plus-end-directed vesicle transport along microtubule / mitocytosis / anterograde dendritic transport of neurotransmitter receptor complex / anterograde neuronal dense core vesicle transport / anterograde axonal protein transport / mitotic spindle midzone / retrograde neuronal dense core vesicle transport ...cytoplasm organization / cytolytic granule membrane / mitotic spindle astral microtubule / plus-end-directed vesicle transport along microtubule / mitocytosis / anterograde dendritic transport of neurotransmitter receptor complex / anterograde neuronal dense core vesicle transport / anterograde axonal protein transport / mitotic spindle midzone / retrograde neuronal dense core vesicle transport / vesicle transport along microtubule / lysosome localization / positive regulation of potassium ion transport / natural killer cell mediated cytotoxicity / Microtubule-dependent trafficking of connexons from Golgi to the plasma membrane / Hedgehog 'off' state / Cilium Assembly / Intraflagellar transport / COPI-dependent Golgi-to-ER retrograde traffic / Carboxyterminal post-translational modifications of tubulin / RHOH GTPase cycle / Sealing of the nuclear envelope (NE) by ESCRT-III / Kinesins / PKR-mediated signaling / The role of GTSE1 in G2/M progression after G2 checkpoint / Aggrephagy / Resolution of Sister Chromatid Cohesion / Mitotic Prometaphase / EML4 and NUDC in mitotic spindle formation / Separation of Sister Chromatids / Kinesins / plus-end-directed microtubule motor activity / RHO GTPases activate KTN1 / RHO GTPases activate IQGAPs / stress granule disassembly / RHO GTPases Activate Formins / Recruitment of NuMA to mitotic centrosomes / HSP90 chaperone cycle for steroid hormone receptors (SHR) in the presence of ligand / MHC class II antigen presentation / mitochondrion transport along microtubule / microtubule depolymerization / ciliary rootlet / COPI-mediated anterograde transport / centrosome localization / COPI-dependent Golgi-to-ER retrograde traffic / microtubule motor activity / kinesin complex / synaptic vesicle transport / Insulin processing / microtubule-based movement / mitotic sister chromatid segregation / centriolar satellite / axon cytoplasm / MHC class II antigen presentation / dendrite cytoplasm / phagocytic vesicle / regulation of membrane potential / positive regulation of synaptic transmission, GABAergic / positive regulation of protein localization to plasma membrane / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / axon guidance / structural constituent of cytoskeleton / cellular response to type II interferon / microtubule cytoskeleton organization / microtubule cytoskeleton / Signaling by ALK fusions and activated point mutants / mitotic cell cycle / microtubule binding / microtubule / vesicle / cadherin binding / GTPase activity / protein-containing complex binding / GTP binding / perinuclear region of cytoplasm / ATP hydrolysis activity / mitochondrion / ATP binding / identical protein binding / membrane / nucleus / metal ion binding / cytoplasm / cytosol Similarity search - Function | ||||||||||||
Biological species | ![]() ![]() ![]() | ||||||||||||
Method | helical reconstruction / cryo EM / Resolution: 3.0 Å | ||||||||||||
![]() | Benoit MPMH / Asenjo AB / Hunter B / Allingham JS / Sosa H | ||||||||||||
Funding support | ![]() ![]()
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![]() | ![]() Title: Kinesin-8-specific loop-2 controls the dual activities of the motor domain according to tubulin protofilament shape. Authors: Byron Hunter / Matthieu P M H Benoit / Ana B Asenjo / Caitlin Doubleday / Daria Trofimova / Corey Frazer / Irsa Shoukat / Hernando Sosa / John S Allingham / ![]() ![]() Abstract: Kinesin-8s are dual-activity motor proteins that can move processively on microtubules and depolymerize microtubule plus-ends, but their mechanism of combining these distinct activities remains ...Kinesin-8s are dual-activity motor proteins that can move processively on microtubules and depolymerize microtubule plus-ends, but their mechanism of combining these distinct activities remains unclear. We addressed this by obtaining cryo-EM structures (2.6-3.9 Å) of Candida albicans Kip3 in different catalytic states on the microtubule lattice and on a curved microtubule end mimic. We also determined a crystal structure of microtubule-unbound CaKip3-ADP (2.0 Å) and analyzed the biochemical activity of CaKip3 and kinesin-1 mutants. These data reveal that the microtubule depolymerization activity of kinesin-8 originates from conformational changes of its motor core that are amplified by dynamic contacts between its extended loop-2 and tubulin. On curved microtubule ends, loop-1 inserts into preceding motor domains, forming head-to-tail arrays of kinesin-8s that complement loop-2 contacts with curved tubulin and assist depolymerization. On straight tubulin protofilaments in the microtubule lattice, loop-2-tubulin contacts inhibit conformational changes in the motor core, but in the ADP-Pi state these contacts are relaxed, allowing neck-linker docking for motility. We propose that these tubulin shape-induced alternations between pro-microtubule-depolymerization and pro-motility kinesin states, regulated by loop-2, are the key to the dual activity of kinesin-8 motors. | ||||||||||||
History |
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Structure visualization
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Downloads & links
-EMDB archive
Map data | ![]() | 39.2 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 23.5 KB 23.5 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 14.7 KB | Display | ![]() |
Images | ![]() | 128 KB | ||
Masks | ![]() ![]() ![]() ![]() | 274.6 MB 274.6 MB 274.6 MB 274.6 MB | ![]() | |
Filedesc metadata | ![]() | 7.9 KB | ||
Others | ![]() ![]() | 218.6 MB 218.4 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 1.2 MB | Display | ![]() |
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Full document | ![]() | 1.2 MB | Display | |
Data in XML | ![]() | 22.2 KB | Display | |
Data in CIF | ![]() | 29.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7tr2MC ![]() 7lffC ![]() 7tqxC ![]() 7tqyC ![]() 7tqzC ![]() 7tr0C ![]() 7tr1C ![]() 7tr3C M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Annotation | Primary map, locally refined on the central asymmetric unit | ||||||||||||||||||||
Voxel size | X=Y=Z: 0.849 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Mask #1
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-Mask #2
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-Mask #3
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-Mask #4
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-Half map: Half map from the gold Standard refinement
File | emd_26079_half_map_1.map | ||||||||||||
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Annotation | Half map from the gold Standard refinement | ||||||||||||
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-Half map: Half map from the gold Standard refinement
File | emd_26079_half_map_2.map | ||||||||||||
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Annotation | Half map from the gold Standard refinement | ||||||||||||
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Density Histograms |
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Sample components
+Entire : Apo CaKip3[2-436]-L2-mutant(HsKHC) in complex with a microtubule
+Supramolecule #1: Apo CaKip3[2-436]-L2-mutant(HsKHC) in complex with a microtubule
+Supramolecule #2: CaKip3[2-436] with L2 swapped with the one of HsKHC, bound to AMP-PNP
+Supramolecule #3: 15R microtubule
+Macromolecule #1: Kinesin-like protein,Kinesin-1 heavy chain
+Macromolecule #2: Tubulin alpha-1B chain
+Macromolecule #3: Tubulin beta-2B chain
+Macromolecule #4: GUANOSINE-5'-TRIPHOSPHATE
+Macromolecule #5: MAGNESIUM ION
+Macromolecule #6: GUANOSINE-5'-DIPHOSPHATE
+Macromolecule #7: TAXOL
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | helical reconstruction |
Aggregation state | filament |
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Sample preparation
Buffer | pH: 6.8 Component:
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Grid | Model: UltrAuFoil R2/2 / Support film - Material: GOLD / Support film - topology: HOLEY / Pretreatment - Type: PLASMA CLEANING | ||||||||||
Vitrification | Cryogen name: ETHANE / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Digitization - Frames/image: 1-40 / Average electron dose: 64.6 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.5 µm / Nominal defocus min: 0.7000000000000001 µm |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
-Atomic model buiding 1
Refinement | Space: REAL / Protocol: FLEXIBLE FIT |
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Output model | ![]() PDB-7tr2: |