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- EMDB-43085: Symmetry expanded map of 2 gamma-tubulins bound to 2 alpha tubuli... -

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Basic information

Entry
Database: EMDB / ID: EMD-43085
TitleSymmetry expanded map of 2 gamma-tubulins bound to 2 alpha tubulins in gamma tubulin ring complex capped microtubule end.
Map dataSymmetry expanded map of gamma-tubulin:gamma tubulin laterally in contact with each other together with the proximal alpha-tubulins in gamma tubulin ring complex upon microtubule nucleation.
Sample
  • Complex: gamma-tubulin and alpha-tubulin
    • Protein or peptide: Tubulin gamma-1 chain
  • Protein or peptide: Tubulin alpha-1B chain
  • Ligand: GUANOSINE-5'-TRIPHOSPHATE
  • Ligand: MAGNESIUM ION
  • Ligand: GUANOSINE-5'-DIPHOSPHATE
Keywordsgamma tubulin ring complex / CELL CYCLE
Function / homology
Function and homology information


Post-chaperonin tubulin folding pathway / Cilium Assembly / cytoskeleton-dependent intracellular transport / Microtubule-dependent trafficking of connexons from Golgi to the plasma membrane / Carboxyterminal post-translational modifications of tubulin / Intraflagellar transport / Sealing of the nuclear envelope (NE) by ESCRT-III / Formation of tubulin folding intermediates by CCT/TriC / Gap junction assembly / COPI-independent Golgi-to-ER retrograde traffic ...Post-chaperonin tubulin folding pathway / Cilium Assembly / cytoskeleton-dependent intracellular transport / Microtubule-dependent trafficking of connexons from Golgi to the plasma membrane / Carboxyterminal post-translational modifications of tubulin / Intraflagellar transport / Sealing of the nuclear envelope (NE) by ESCRT-III / Formation of tubulin folding intermediates by CCT/TriC / Gap junction assembly / COPI-independent Golgi-to-ER retrograde traffic / Kinesins / Assembly and cell surface presentation of NMDA receptors / COPI-dependent Golgi-to-ER retrograde traffic / Recycling pathway of L1 / RHOH GTPase cycle / RHO GTPases activate IQGAPs / microtubule-based process / Hedgehog 'off' state / Activation of AMPK downstream of NMDARs / cytoplasmic microtubule / COPI-mediated anterograde transport / Mitotic Prometaphase / EML4 and NUDC in mitotic spindle formation / MHC class II antigen presentation / Recruitment of NuMA to mitotic centrosomes / Resolution of Sister Chromatid Cohesion / cellular response to interleukin-4 / HSP90 chaperone cycle for steroid hormone receptors (SHR) in the presence of ligand / Translocation of SLC2A4 (GLUT4) to the plasma membrane / RHO GTPases Activate Formins / PKR-mediated signaling / structural constituent of cytoskeleton / microtubule cytoskeleton organization / HCMV Early Events / Aggrephagy / Separation of Sister Chromatids / The role of GTSE1 in G2/M progression after G2 checkpoint / mitotic cell cycle / double-stranded RNA binding / microtubule cytoskeleton / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / microtubule / cilium / cell division / GTPase activity / ubiquitin protein ligase binding / GTP binding / structural molecule activity / cytoplasm
Similarity search - Function
Alpha 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 ...Alpha 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
Similarity search - Domain/homology
Tubulin alpha-1B chain
Similarity search - Component
Biological speciesTrichoplusia ni (cabbage looper) / Homo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.5 Å
AuthorsAher A / Urnavicius L / Kapoor TM
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Cancer Institute (NIH/NCI)GM130234 United States
CitationJournal: Nat Struct Mol Biol / Year: 2024
Title: Structure of the γ-tubulin ring complex-capped microtubule.
Authors: Amol Aher / Linas Urnavicius / Allen Xue / Kasahun Neselu / Tarun M Kapoor /
Abstract: Microtubules are composed of α-tubulin and β-tubulin dimers positioned head-to-tail to form protofilaments that associate laterally in varying numbers. It is not known how cellular microtubules ...Microtubules are composed of α-tubulin and β-tubulin dimers positioned head-to-tail to form protofilaments that associate laterally in varying numbers. It is not known how cellular microtubules assemble with the canonical 13-protofilament architecture, resulting in micrometer-scale α/β-tubulin tracks for intracellular transport that align with, rather than spiral along, the long axis of the filament. We report that the human ~2.3 MDa γ-tubulin ring complex (γ-TuRC), an essential regulator of microtubule formation that contains 14 γ-tubulins, selectively nucleates 13-protofilament microtubules. Cryogenic electron microscopy reconstructions of γ-TuRC-capped microtubule minus ends reveal the extensive intra-domain and inter-domain motions of γ-TuRC subunits that accommodate luminal bridge components and establish lateral and longitudinal interactions between γ-tubulins and α-tubulins. Our structures suggest that γ-TuRC, an inefficient nucleation template owing to its splayed conformation, can transform into a compacted cap at the microtubule minus end and set the lattice architecture of cellular microtubules.
History
DepositionDec 10, 2023-
Header (metadata) releaseMar 27, 2024-
Map releaseMar 27, 2024-
UpdateJun 4, 2025-
Current statusJun 4, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_43085.png

Downloads & links

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Map

FileDownload / File: emd_43085.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationSymmetry expanded map of gamma-tubulin:gamma tubulin laterally in contact with each other together with the proximal alpha-tubulins in gamma tubulin ring complex upon microtubule nucleation.
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.32 Å/pix.
x 360 pix.
= 475.2 Å		1.32 Å/pix.
x 360 pix.
= 475.2 Å		1.32 Å/pix.
x 360 pix.
= 475.2 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.32 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0123
Minimum - Maximum-0.034234986 - 0.056692388
Average (Standard dev.)0.000032187894 (±0.00087542867)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 475.2 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Symmetry expanded map of gamma-tubulin:gamma tubulin laterally in...

Fileemd_43085_half_map_1.map
AnnotationSymmetry expanded map of gamma-tubulin:gamma tubulin laterally in contact with each other together with the proximal alpha-tubulins in gamma tubulin ring complex upon microtubule nucleation.
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Symmetry expanded map of gamma-tubulin:gamma tubulin laterally in...

Fileemd_43085_half_map_2.map
AnnotationSymmetry expanded map of gamma-tubulin:gamma tubulin laterally in contact with each other together with the proximal alpha-tubulins in gamma tubulin ring complex upon microtubule nucleation.
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : gamma-tubulin and alpha-tubulin

EntireName: gamma-tubulin and alpha-tubulin
Components
  • Complex: gamma-tubulin and alpha-tubulin
    • Protein or peptide: Tubulin gamma-1 chain
  • Protein or peptide: Tubulin alpha-1B chain
  • Ligand: GUANOSINE-5'-TRIPHOSPHATE
  • Ligand: MAGNESIUM ION
  • Ligand: GUANOSINE-5'-DIPHOSPHATE

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Supramolecule #1: gamma-tubulin and alpha-tubulin

SupramoleculeName: gamma-tubulin and alpha-tubulin / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #2
Source (natural)Organism: Trichoplusia ni (cabbage looper)

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Macromolecule #1: Tubulin alpha-1B chain

MacromoleculeName: Tubulin alpha-1B chain / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
EC number: Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 51.019297 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: MRECISIHVG QAGVQIGNAC WELYCLEHGI QPDGQMPSDK TIHHHHHHGG GDDSFNTFFS ETGAGKHVPR AVFVDLEPTV IDEVRTGTY RQLFHPEQLI TGKEDAANNY ARGHYTIGKE IIDLVLDRIR KLADQCTGLQ GFLVFHSFGG GTGSGFTSLL M ERLSVDYG ...String:
MRECISIHVG QAGVQIGNAC WELYCLEHGI QPDGQMPSDK TIHHHHHHGG GDDSFNTFFS ETGAGKHVPR AVFVDLEPTV IDEVRTGTY RQLFHPEQLI TGKEDAANNY ARGHYTIGKE IIDLVLDRIR KLADQCTGLQ GFLVFHSFGG GTGSGFTSLL M ERLSVDYG KKSKLEFSIY PAPQVSTAVV EPYNSILTTH TTLEHSDCAF MVDNEAIYDI CRRNLDIERP TYTNLNRLIS QI VSSITAS LRFDGALNVD LTDFQTNLVP YPRIHFPLAT YAPVISAEKA YHEQLSVAEI TNACFEPANQ MVKCDPRHGK YMA CCLLYR GDVVPKDVNA AIATIKTKRS IQFVDWCPTG FKVGINYQPP TVVPGGDLAK VQRAVCMLSN TTAIAEAWAR LDHK FDLMY AKRAFVHWYV GEGMEEGEFS EAREDMAALE KDYEEVGVDS VEGEGEEEGE EY

UniProtKB: Tubulin alpha-1B chain

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Macromolecule #2: Tubulin gamma-1 chain

MacromoleculeName: Tubulin gamma-1 chain / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 50.019539 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: MPREIITLQL GQCGNQIGFE FWKQLCAEHG ISPEGIVEEF ATEGTDRKDV FFYQADDEHY IPRAVLLDLE PRVIHSILNS PYAKLYNPE NIYLSEHGGG AGNNWASGFS QGEKIHEDIF DIIDREADGS DSLEGFVLCH SIAGGTGSGL GSYLLERLND R YPKKLVQT ...String:
MPREIITLQL GQCGNQIGFE FWKQLCAEHG ISPEGIVEEF ATEGTDRKDV FFYQADDEHY IPRAVLLDLE PRVIHSILNS PYAKLYNPE NIYLSEHGGG AGNNWASGFS QGEKIHEDIF DIIDREADGS DSLEGFVLCH SIAGGTGSGL GSYLLERLND R YPKKLVQT YSVFPNQDEM SDVVVQPYNS LLTLKRLTQN ADCVVVLDNT ALNRIATDRL HIQNPSFSQI NQLVSTIMSA ST TTLRYPG YMNNDLIGLI ASLIPTPRLH FLMTGYTPLT TDQSVASVRK TTVLDVMRRL LQPKNVMVST GRDRQTNHCY IAI LNIIQG EVDPTQVHKS LQRIRERKLA NFIPWGPASI QVALSRKSPY LPSAHRVSGL MMANHTSISS LFERTCRQYD KLRK REAFL EQFRKEDMFK DNFDEMDTSR EIVQQLIDEY HAATRP

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Macromolecule #3: GUANOSINE-5'-TRIPHOSPHATE

MacromoleculeName: GUANOSINE-5'-TRIPHOSPHATE / type: ligand / ID: 3 / Number of copies: 2 / 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 #4: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 4 / Number of copies: 2 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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Macromolecule #5: GUANOSINE-5'-DIPHOSPHATE

MacromoleculeName: GUANOSINE-5'-DIPHOSPHATE / type: ligand / ID: 5 / Number of copies: 2 / Formula: GDP
Molecular weightTheoretical: 443.201 Da
Chemical component information

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

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 6.8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 60.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: OTHER / Imaging mode: OTHER / Nominal defocus max: 3.5 µm / Nominal defocus min: 1.5 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

6dpv

Final reconstructionResolution.type: BY AUTHOR / Resolution: 4.5 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 70362
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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