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- EMDB-26076: Apo CaKip3[2-482] in complex with a microtubule -

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Entry
Database: EMDB / ID: EMD-26076
TitleApo CaKip3[2-482] in complex with a microtubule
Map dataPrimary map, locally refined on the central asymmetric unit
Sample
  • Complex: Apo CaKip3[2-482] in complex with a microtubule
    • Complex: Apo CaKip3[2-482]
      • Protein or peptide: Kinesin-like protein
    • Organelle or cellular component: 15R Microtubule
      • Protein or peptide: Tubulin alpha-1B chain
      • Protein or peptide: Tubulin beta-2B chain
  • Ligand: GUANOSINE-5'-TRIPHOSPHATE
  • Ligand: MAGNESIUM ION
  • Ligand: GUANOSINE-5'-DIPHOSPHATE
  • Ligand: TAXOL
KeywordsKip3 / kinesin / motility / microtubule / tubulin / MOTOR PROTEIN
Function / homology
Function and homology information


tubulin-dependent ATPase activity / plus-end specific microtubule depolymerization / regulation of mitotic spindle elongation / meiotic sister chromatid segregation / mitotic spindle astral microtubule / nuclear microtubule / mitotic spindle midzone / nuclear migration along microtubule / microtubule plus-end / Microtubule-dependent trafficking of connexons from Golgi to the plasma membrane ...tubulin-dependent ATPase activity / plus-end specific microtubule depolymerization / regulation of mitotic spindle elongation / meiotic sister chromatid segregation / mitotic spindle astral microtubule / nuclear microtubule / mitotic spindle midzone / nuclear migration along microtubule / microtubule plus-end / 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 / mitotic spindle disassembly / plus-end-directed microtubule motor activity / RHO GTPases activate IQGAPs / RHO GTPases Activate Formins / HSP90 chaperone cycle for steroid hormone receptors (SHR) in the presence of ligand / MHC class II antigen presentation / Recruitment of NuMA to mitotic centrosomes / microtubule depolymerization / COPI-mediated anterograde transport / kinesin complex / negative regulation of microtubule polymerization / microtubule-based movement / establishment of mitotic spindle orientation / mitotic sister chromatid segregation / mitotic spindle assembly / mitotic spindle organization / structural constituent of cytoskeleton / microtubule cytoskeleton organization / microtubule cytoskeleton / mitotic cell cycle / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / microtubule binding / microtubule / GTPase activity / GTP binding / ATP hydrolysis activity / ATP binding / nucleus / metal ion binding / cytoplasm
Similarity search - Function
Kinesin-like protein / Kinesin motor domain signature. / Kinesin motor domain, conserved site / Kinesin motor domain / Kinesin motor domain profile. / Kinesin motor, catalytic domain. ATPase. / Kinesin motor domain / Kinesin motor domain superfamily / Alpha tubulin / Tubulin-beta mRNA autoregulation signal. ...Kinesin-like protein / Kinesin motor domain signature. / Kinesin motor domain, conserved site / Kinesin motor domain / Kinesin motor domain profile. / Kinesin motor, catalytic domain. ATPase. / Kinesin motor domain / Kinesin motor domain superfamily / Alpha tubulin / Tubulin-beta mRNA autoregulation signal. / Beta tubulin, autoregulation binding site / Beta tubulin / Tubulin / Tubulin, C-terminal / Tubulin C-terminal domain / Tubulin, conserved site / Tubulin subunits alpha, beta, and gamma signature. / Tubulin/FtsZ family, C-terminal domain / Tubulin/FtsZ-like, C-terminal domain / Tubulin/FtsZ, C-terminal / Tubulin/FtsZ, 2-layer sandwich domain / Tubulin/FtsZ family, GTPase domain / Tubulin/FtsZ family, GTPase domain / Tubulin/FtsZ, GTPase domain / Tubulin/FtsZ, GTPase domain superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Kinesin-like protein / Tubulin beta chain / Tubulin alpha-1B chain
Similarity search - Component
Biological speciesCandida albicans (yeast) / Sus scrofa (pig)
Methodhelical reconstruction / cryo EM / Resolution: 2.7 Å
AuthorsBenoit MPMH / Asenjo AB / Hunter B / Allingham JS / Sosa H
Funding support United States, Canada, 3 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01GM113164 United States
Natural Sciences and Engineering Research Council (NSERC, Canada)RGPIN/356025-2013 Canada
Canadian Institutes of Health Research (CIHR)MOP-97832 Canada
CitationJournal: Nat Commun / Year: 2022
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
DepositionJan 27, 2022-
Header (metadata) releaseJul 13, 2022-
Map releaseJul 13, 2022-
UpdateFeb 21, 2024-
Current statusFeb 21, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_26076.png

Downloads & links

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Map

FileDownload / File: emd_26076.map.gz / Format: CCP4 / Size: 274.6 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationPrimary map, locally refined on the central asymmetric unit
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.83 Å/pix.
x 416 pix.
= 343.2 Å		0.83 Å/pix.
x 416 pix.
= 343.2 Å		0.83 Å/pix.
x 416 pix.
= 343.2 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.825 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.009
Minimum - Maximum0.0 - 0.1070753
Average (Standard dev.)0.00060893927 (±0.0029820097)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions416416416
Spacing416416416
CellA=B=C: 343.19998 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_26076_msk_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
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Mask #2

Fileemd_26076_msk_2.map
Projections & Slices
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Histogram (log scale)

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Mask #3

Fileemd_26076_msk_3.map
Projections & Slices
AxesZYX

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Histogram (log scale)

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Mask #4

Fileemd_26076_msk_4.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
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Histogram

Histogram (log scale)

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Half map: Half map from the gold Standard refinement

Fileemd_26076_half_map_1.map
AnnotationHalf map from the gold Standard refinement
Projections & Slices
AxesZYX

Projections

Slices (1/2)
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Histogram

Histogram (log scale)

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Half map: Half map from the gold Standard refinement

Fileemd_26076_half_map_2.map
AnnotationHalf map from the gold Standard refinement
Projections & Slices
AxesZYX

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Sample components

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Entire : Apo CaKip3[2-482] in complex with a microtubule

EntireName: Apo CaKip3[2-482] in complex with a microtubule
Components
  • Complex: Apo CaKip3[2-482] in complex with a microtubule
    • Complex: Apo CaKip3[2-482]
      • Protein or peptide: Kinesin-like protein
    • Organelle or cellular component: 15R Microtubule
      • Protein or peptide: Tubulin alpha-1B chain
      • Protein or peptide: Tubulin beta-2B chain
  • Ligand: GUANOSINE-5'-TRIPHOSPHATE
  • Ligand: MAGNESIUM ION
  • Ligand: GUANOSINE-5'-DIPHOSPHATE
  • Ligand: TAXOL

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Supramolecule #1: Apo CaKip3[2-482] in complex with a microtubule

SupramoleculeName: Apo CaKip3[2-482] in complex with a microtubule / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#3

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Supramolecule #2: Apo CaKip3[2-482]

SupramoleculeName: Apo CaKip3[2-482] / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #3
Source (natural)Organism: Candida albicans (yeast)

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Supramolecule #3: 15R Microtubule

SupramoleculeName: 15R Microtubule / type: organelle_or_cellular_component / ID: 3 / Parent: 1 / Macromolecule list: #1-#2
Source (natural)Organism: Sus scrofa (pig) / Organ: Brain

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Macromolecule #1: Tubulin alpha-1B chain

MacromoleculeName: Tubulin alpha-1B chain / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Sus scrofa (pig) / Organ: Brain
Molecular weightTheoretical: 50.204445 KDa
SequenceString: MRECISIHVG QAGVQIGNAC WELYCLEHGI QPDGQMPSDK TIGGGDDSFN TFFSETGAGK HVPRAVFVDL EPTVIDEVRT GTYRQLFHP EQLITGKEDA ANNYARGHYT IGKEIIDLVL DRIRKLADQC TGLQGFLVFH SFGGGTGSGF TSLLMERLSV D YGKKSKLE ...String:
MRECISIHVG QAGVQIGNAC WELYCLEHGI QPDGQMPSDK TIGGGDDSFN TFFSETGAGK HVPRAVFVDL EPTVIDEVRT GTYRQLFHP EQLITGKEDA ANNYARGHYT IGKEIIDLVL DRIRKLADQC TGLQGFLVFH SFGGGTGSGF TSLLMERLSV D YGKKSKLE FSIYPAPQVS TAVVEPYNSI LTTHTTLEHS DCAFMVDNEA IYDICRRNLD IERPTYTNLN RLISQIVSSI TA SLRFDGA LNVDLTEFQT NLVPYPRIHF PLATYAPVIS AEKAYHEQLS VAEITNACFE PANQMVKCDP RHGKYMACCL LYR GDVVPK DVNAAIATIK TKRSIQFVDW CPTGFKVGIN YQPPTVVPGG DLAKVQRAVC MLSNTTAIAE AWARLDHKFD LMYA KRAFV HWYVGEGMEE GEFSEAREDM AALEKDYEEV GVDSVEGEGE EEGEEY

UniProtKB: Tubulin alpha-1B chain

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Macromolecule #2: Tubulin beta-2B chain

MacromoleculeName: Tubulin beta-2B chain / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Sus scrofa (pig) / Organ: Brain
Molecular weightTheoretical: 49.999887 KDa
SequenceString: MREIVHIQAG QCGNQIGAKF WEVISDEHGI DPTGSYHGDS DLQLERINVY YNEATGNKYV PRAILVDLEP GTMDSVRSGP FGQIFRPDN FVFGQSGAGN NWAKGHYTEG AELVDSVLDV VRKESESCDC LQGFQLTHSL GGGTGSGMGT LLISKIREEY P DRIMNTFS ...String:
MREIVHIQAG QCGNQIGAKF WEVISDEHGI DPTGSYHGDS DLQLERINVY YNEATGNKYV PRAILVDLEP GTMDSVRSGP FGQIFRPDN FVFGQSGAGN NWAKGHYTEG AELVDSVLDV VRKESESCDC LQGFQLTHSL GGGTGSGMGT LLISKIREEY P DRIMNTFS VMPSPKVSDT VVEPYNATLS VHQLVENTDE TYCIDNEALY DICFRTLKLT TPTYGDLNHL VSATMSGVTT CL RFPGQLN ADLRKLAVNM VPFPRLHFFM PGFAPLTSRG SQQYRALTVP ELTQQMFDSK NMMAACDPRH GRYLTVAAIF RGR MSMKEV DEQMLNVQNK NSSYFVEWIP NNVKTAVCDI PPRGLKMSAT FIGNSTAIQE LFKRISEQFT AMFRRKAFLH WYTG EGMDE MEFTEAESNM NDLVSEYQQY QDATADEQGE FEEEEGEDEA

UniProtKB: Tubulin beta chain

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Macromolecule #3: Kinesin-like protein

MacromoleculeName: Kinesin-like protein / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Candida albicans (yeast)
Molecular weightTheoretical: 54.869469 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MASYPNSLGS PATVTSTSVP TAKQSSISVA VRVRPFTEAE SNRLVKIDND DVFLGDGCLT SDNNNNNNNS NSNGNGNGNG SSAANSSGA STSRRAIFNT LGGLRKIINV VDDRMLIFDP PETNPLTKMQ RNAFPNSFKG SRIREHRFVF DRLFDEDCTQ D QVYRNTTQ ...String:
MASYPNSLGS PATVTSTSVP TAKQSSISVA VRVRPFTEAE SNRLVKIDND DVFLGDGCLT SDNNNNNNNS NSNGNGNGNG SSAANSSGA STSRRAIFNT LGGLRKIINV VDDRMLIFDP PETNPLTKMQ RNAFPNSFKG SRIREHRFVF DRLFDEDCTQ D QVYRNTTQ PLLDSVLDGY NATVFAYGAT GCGKTHTISG TPEDPGVIFL TMKELYNRIE ELKDTKIIDI SLSYLEIYNE TI RDLLNPM TQCKNLVIRE DANNKISVSN LSRHRPNSVE EVMQLILEGN KNRTCSPTEA NATSSRSHAV LQINVIQKDR TGD ITEEHT FATLSIIDLA GSERAAATKN RGARLNEGAN INKSLLALGN CINALCDPRR RNHVPYRDSK LTRLLKFSLG GNCK TVMIV CVSPSSQHYD ETLNTLKYAD RAKEIKTKLI RNQHNLDRHV GSYLKMITEQ KQEIEELRAR ESKMVESTIN KRKDL ESKL EHHHHHH

UniProtKB: Kinesin-like protein

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Macromolecule #4: GUANOSINE-5'-TRIPHOSPHATE

MacromoleculeName: GUANOSINE-5'-TRIPHOSPHATE / type: ligand / ID: 4 / Number of copies: 1 / Formula: GTP
Molecular weightTheoretical: 523.18 Da
Chemical component information

ChemComp-GTP:
GUANOSINE-5'-TRIPHOSPHATE / GTP, energy-carrying molecule*YM

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Macromolecule #5: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 5 / Number of copies: 1 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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Macromolecule #6: GUANOSINE-5'-DIPHOSPHATE

MacromoleculeName: GUANOSINE-5'-DIPHOSPHATE / type: ligand / ID: 6 / Number of copies: 1 / Formula: GDP
Molecular weightTheoretical: 443.201 Da
Chemical component information

ChemComp-GDP:
GUANOSINE-5'-DIPHOSPHATE / GDP, energy-carrying molecule*YM

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Macromolecule #7: TAXOL

MacromoleculeName: TAXOL / type: ligand / ID: 7 / Number of copies: 1 / Formula: TA1
Molecular weightTheoretical: 853.906 Da
Chemical component information

ChemComp-TA1:
TAXOL / medication, chemotherapy*YM

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Experimental details

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Structure determination

Methodcryo EM
Processinghelical reconstruction
Aggregation statefilament

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Sample preparation

BufferpH: 6.8
Component:
ConcentrationName
80.0 mMK-PIPES
20.0 uMPaclitaxel
1.0 mMMagnesium chloride
1.0 mMEGTA
GridModel: UltrAuFoil R2/2 / Material: GOLD / Support film - Material: GOLD / Support film - topology: HOLEY / Pretreatment - Type: PLASMA CLEANING
VitrificationCryogen name: ETHANE / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Digitization - Frames/image: 1-40 / Average electron dose: 71.05 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.48 µm / Nominal defocus min: 0.6900000000000001 µm
Sample stageSpecimen 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

Final reconstructionApplied symmetry - Helical parameters - Δz: 5.55 Å
Applied symmetry - Helical parameters - Δ&Phi: 168.087 °
Applied symmetry - Helical parameters - Axial symmetry: C1 (asymmetric)
Resolution.type: BY AUTHOR / Resolution: 2.7 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.1)
Details: 2 half datasets containing one distinct half of each filament were refined independently. Number of asymmetric units used is reported in "number of segments used", due to the local processing strategy employed.
Number images used: 162955
Segment selectionDetails: manual picking of filaments
Startup modelType of model: OTHER
Final angle assignmentType: NOT APPLICABLE / Software - Name: RELION (ver. 3.1)
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementSpace: REAL / Protocol: FLEXIBLE FIT
Output model

PDB-7tqz:
Apo CaKip3[2-482] in complex with a microtubule

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