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Open data
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Basic information
Entry | Database: PDB / ID: 7lff | ||||||
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Title | Crystal structure of the Candida albicans kinesin-8 motor domain | ||||||
![]() | Kinesin-like protein | ||||||
![]() | MOTOR PROTEIN / kinesin / microtubule / depolymerase / motility / cytoskeleton | ||||||
Function / homology | ![]() tubulin-dependent ATPase activity / plus-end specific microtubule depolymerization / regulation of mitotic spindle elongation / meiotic sister chromatid segregation / mitotic spindle astral microtubule / mitotic spindle midzone / nuclear microtubule / nuclear migration along microtubule / microtubule plus-end / mitotic spindle disassembly ...tubulin-dependent ATPase activity / plus-end specific microtubule depolymerization / regulation of mitotic spindle elongation / meiotic sister chromatid segregation / mitotic spindle astral microtubule / mitotic spindle midzone / nuclear microtubule / nuclear migration along microtubule / microtubule plus-end / mitotic spindle disassembly / plus-end-directed microtubule motor activity / microtubule depolymerization / negative regulation of microtubule polymerization / kinesin complex / microtubule-based movement / mitotic sister chromatid segregation / establishment of mitotic spindle orientation / mitotic spindle assembly / mitotic spindle organization / microtubule binding / ATP hydrolysis activity / ATP binding / nucleus / metal ion binding Similarity search - Function | ||||||
Biological species | ![]() | ||||||
Method | ![]() ![]() ![]() | ||||||
![]() | Allingham, J.S. / Hunter, B. | ||||||
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
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 186.1 KB | Display | ![]() |
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PDB format | ![]() | 116.5 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 2 MB | Display | ![]() |
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Full document | ![]() | 2 MB | Display | |
Data in XML | ![]() | 27.4 KB | Display | |
Data in CIF | ![]() | 37.8 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7tqxC ![]() 7tqyC ![]() 7tqzC ![]() 7tr0C ![]() 7tr1C ![]() 7tr2C ![]() 7tr3C ![]() 3lreS S: Starting model for refinement C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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2 | ![]()
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Unit cell |
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Components
#1: Protein | Mass: 49348.188 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Strain: SC5314 / ATCC MYA-2876 / Gene: KIP3, orf19.7353, CAALFM_C305720CA / Production host: ![]() ![]() #2: Chemical | #3: Chemical | #4: Water | ChemComp-HOH / | Has ligand of interest | Y | |
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-Experimental details
-Experiment
Experiment | Method: ![]() |
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Sample preparation
Crystal | Density Matthews: 2 Å3/Da / Density % sol: 38.59 % |
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Crystal grow | Temperature: 277 K / Method: vapor diffusion, hanging drop / pH: 8 Details: 0.1 M MMT, 25% PEG 1500, pH 8, VAPOR DIFFUSION, HANGING DROP, temperature 277K |
-Data collection
Diffraction | Mean temperature: 100 K / Serial crystal experiment: N |
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Diffraction source | Source: ![]() ![]() ![]() |
Detector | Type: DECTRIS PILATUS 6M / Detector: PIXEL / Date: Mar 14, 2018 |
Radiation | Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray |
Radiation wavelength | Wavelength: 0.9795 Å / Relative weight: 1 |
Reflection | Resolution: 2.01→45.91 Å / Num. obs: 49650 / % possible obs: 97.42 % / Redundancy: 2.7 % / Biso Wilson estimate: 46.62 Å2 / Rmerge(I) obs: 0.114 / Rpim(I) all: 0.082 / Rrim(I) all: 0.141 / Net I/σ(I): 4.6 |
Reflection shell | Resolution: 2.01→2.08 Å / Num. unique obs: 19655 / CC1/2: 0.149 / % possible all: 96.7 |
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Processing
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Refinement | Method to determine structure: ![]() Starting model: 3LRE Resolution: 2.01→45.91 Å / SU ML: 0.4993 / Cross valid method: FREE R-VALUE / σ(F): 1.91 / Phase error: 38.997 Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
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Solvent computation | Shrinkage radii: 0.9 Å / VDW probe radii: 1.11 Å / Solvent model: FLAT BULK SOLVENT MODEL | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso mean: 59.75 Å2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement step | Cycle: LAST / Resolution: 2.01→45.91 Å
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Refine LS restraints |
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LS refinement shell |
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