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- EMDB-44762: Structure of alpha1B and betaI/IVb microtubule bound to GMPCPP -

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Basic information

Entry
Database: EMDB / ID: EMD-44762
TitleStructure of alpha1B and betaI/IVb microtubule bound to GMPCPP
Map dataFull B-factor sharpened map of a1B/bI bIVb microtubule
Sample
  • Complex: alpha1B and betaI/IVb microtubule
    • Protein or peptide: Tubulin alpha-1B chain
    • Protein or peptide: Tubulin beta chain
  • Ligand: GUANOSINE-5'-TRIPHOSPHATE
  • Ligand: MAGNESIUM ION
  • Ligand: PHOSPHOMETHYLPHOSPHONIC ACID GUANYLATE ESTER
Keywordshuman microtubule / tubulin isoforms / cytoskeleton / STRUCTURAL PROTEIN
Function / homology
Function and homology information


odontoblast differentiation / 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 ...odontoblast differentiation / 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 / Kinesins / GTPase activating protein binding / COPI-independent Golgi-to-ER retrograde traffic / Assembly and cell surface presentation of NMDA receptors / COPI-dependent Golgi-to-ER retrograde traffic / natural killer cell mediated cytotoxicity / regulation of synapse organization / nuclear envelope lumen / Recycling pathway of L1 / MHC class I protein binding / RHOH GTPase cycle / RHO GTPases activate IQGAPs / microtubule-based process / Hedgehog 'off' state / COPI-mediated anterograde transport / Activation of AMPK downstream of NMDARs / intercellular bridge / spindle assembly / cytoplasmic microtubule / Mitotic Prometaphase / EML4 and NUDC in mitotic spindle formation / Loss of Nlp from mitotic centrosomes / Loss of proteins required for interphase microtubule organization from the centrosome / Recruitment of mitotic centrosome proteins and complexes / MHC class II antigen presentation / cellular response to interleukin-4 / Recruitment of NuMA to mitotic centrosomes / Anchoring of the basal body to the plasma membrane / HSP90 chaperone cycle for steroid hormone receptors (SHR) in the presence of ligand / Resolution of Sister Chromatid Cohesion / AURKA Activation by TPX2 / Translocation of SLC2A4 (GLUT4) to the plasma membrane / RHO GTPases Activate Formins / PKR-mediated signaling / structural constituent of cytoskeleton / microtubule cytoskeleton organization / cytoplasmic ribonucleoprotein granule / HCMV Early Events / Aggrephagy / The role of GTSE1 in G2/M progression after G2 checkpoint / mitotic spindle / azurophil granule lumen / Separation of Sister Chromatids / Regulation of PLK1 Activity at G2/M Transition / mitotic cell cycle / double-stranded RNA binding / microtubule cytoskeleton / cell body / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / Potential therapeutics for SARS / microtubule / cytoskeleton / cilium / membrane raft / protein domain specific binding / cell division / GTPase activity / ubiquitin protein ligase binding / Neutrophil degranulation / GTP binding / protein-containing complex binding / structural molecule activity / protein-containing complex / extracellular exosome / extracellular region / metal ion binding / nucleus / cytoplasm / cytosol
Similarity search - Function
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 ...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
Similarity search - Domain/homology
Tubulin beta chain / Tubulin alpha-1B chain
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsZehr EA / Roll-Mecak A
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)NS003164 United States
CitationJournal: Biorxiv / Year: 2023
Title: Cryo-EM structures of human alpha1B/betaI+betaIVb microtubules shed light on isoform specific assembly
Authors: Zehr EA / Roll-Mecak A
History
DepositionMay 7, 2024-
Header (metadata) releaseJun 12, 2024-
Map releaseJun 12, 2024-
UpdateJun 11, 2025-
Current statusJun 11, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_44762.png

Downloads & links

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Map

FileDownload / File: emd_44762.map.gz / Format: CCP4 / Size: 699 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationFull B-factor sharpened map of a1B/bI bIVb microtubule
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.06 Å/pix.
x 568 pix.
= 602.08 Å		1.06 Å/pix.
x 568 pix.
= 602.08 Å		1.06 Å/pix.
x 568 pix.
= 602.08 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.06 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.007
Minimum - Maximum-0.032085694 - 0.053301096
Average (Standard dev.)0.000017658347 (±0.0005318483)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions568568568
Spacing568568568
CellA=B=C: 602.07996 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_44762_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Additional map: Full raw map of a1B/bI bIVb microtubule

Fileemd_44762_additional_1.map
AnnotationFull raw map of a1B/bI bIVb microtubule
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Additional map: Full map of a1B/bI bIVb microtubule modified with DeepEMhancer

Fileemd_44762_additional_2.map
AnnotationFull map of a1B/bI bIVb microtubule modified with DeepEMhancer
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: First half-map of a1B/bI bIVb microtubule

Fileemd_44762_half_map_1.map
AnnotationFirst half-map of a1B/bI bIVb microtubule
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Second half-map of a1B/bI bIVb microtubule

Fileemd_44762_half_map_2.map
AnnotationSecond half-map of a1B/bI bIVb microtubule
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : alpha1B and betaI/IVb microtubule

EntireName: alpha1B and betaI/IVb microtubule
Components
  • Complex: alpha1B and betaI/IVb microtubule
    • Protein or peptide: Tubulin alpha-1B chain
    • Protein or peptide: Tubulin beta chain
  • Ligand: GUANOSINE-5'-TRIPHOSPHATE
  • Ligand: MAGNESIUM ION
  • Ligand: PHOSPHOMETHYLPHOSPHONIC ACID GUANYLATE ESTER

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Supramolecule #1: alpha1B and betaI/IVb microtubule

SupramoleculeName: alpha1B and betaI/IVb microtubule / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2 / Details: Microtubules were double-cycled with GMPCPP
Source (natural)Organism: Homo sapiens (human) / Organ: kidney / Location in cell: cytoplasm
Molecular weightTheoretical: 300 KDa

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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
Source (natural)Organism: Homo sapiens (human) / Organ: kidney / Location in cell: cytoplasm
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 chain

MacromoleculeName: Tubulin beta chain / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human) / Organ: kidney / Location in cell: cytoplasm
Molecular weightTheoretical: 49.717629 KDa
SequenceString: MREIVHIQAG QCGNQIGAKF WEVISDEHGI DPTGTYHGDS DLQLDRISVY YNEATGGKYV PRAILVDLEP GTMDSVRSGP FGQIFRPDN FVFGQSGAGN NWAKGHYTEG AELVDSVLDV VRKEAESCDC LQGFQLTHSL GGGTGSGMGT LLISKIREEY P DRIMNTFS ...String:
MREIVHIQAG QCGNQIGAKF WEVISDEHGI DPTGTYHGDS DLQLDRISVY YNEATGGKYV PRAILVDLEP GTMDSVRSGP FGQIFRPDN FVFGQSGAGN NWAKGHYTEG AELVDSVLDV VRKEAESCDC LQGFQLTHSL GGGTGSGMGT LLISKIREEY P DRIMNTFS VVPSPKVSDT VVEPYNATLS VHQLVENTDE TYCIDNEALY DICFRTLKLT TPTYGDLNHL VSATMSGVTT CL RFPGQLN ADLRKLAVNM VPFPRLHFFM PGFAPLTSRG SQQYRALTVP ELTQQVFDAK NMMAACDPRH GRYLTVAAVF RGR MSMKEV DEQMLNVQNK NSSYFVEWIP NNVKTAVCDI PPRGLKMAVT FIGNSTAIQE LFKRISEQFT AMFRRKAFLH WYTG EGMDE MEFTEAESNM NDLVSEYQQY QDATAEEEED FGEEAEEEA

UniProtKB: Tubulin beta chain

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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: 4 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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Macromolecule #5: PHOSPHOMETHYLPHOSPHONIC ACID GUANYLATE ESTER

MacromoleculeName: PHOSPHOMETHYLPHOSPHONIC ACID GUANYLATE ESTER / type: ligand / ID: 5 / Number of copies: 2 / Formula: G2P
Molecular weightTheoretical: 521.208 Da
Chemical component information

ChemComp-G2P:
PHOSPHOMETHYLPHOSPHONIC ACID GUANYLATE ESTER / GMP-CPP, energy-carrying molecule analogue*YM

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation statefilament

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Sample preparation

Concentration0.1 mg/mL
BufferpH: 7
Component:
ConcentrationFormulaName
80.0 mMC8H18N2O6S2PIPES
1.0 mMMgCl2Magnesium chloride
1.0 mMC14H24N2O10EGTA
1.0 mMC11H18N5O13P3GMPCPP
GridModel: C-flat-1.2/1.3 / Material: GOLD / Mesh: 400 / Support film - Material: CARBON / Support film - topology: HOLEY / Support film - Film thickness: 100 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 30 sec.
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 303 K / Instrument: LEICA EM GP
Details: Double-cycled GMPCPP microtubules were diluted to 2.5uM in Brb80 buffer. 5 ul of microtubules were applied to glow-discharged cryo-EM grid and allowed to absorb for 30 sec..
DetailsMicrotubules were double-cycled with GMPCPP

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Specialist opticsEnergy filter - Name: GIF Bioquantum / Energy filter - Slit width: 20 eV
SoftwareName: SerialEM
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Digitization - Frames/image: 1-40 / Number real images: 6930 / Average exposure time: 7.8 sec. / Average electron dose: 56.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.5 µm / Nominal defocus min: 0.5 µm / Nominal magnification: 130000
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 124408 / Details: Manual picking
CTF correctionSoftware - Name: Gctf / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: OTHER
Details: synthetic microtubule references were generated in UCSF Chimera
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0) / Number images used: 124408
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0)
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

5n5n


Chain - Residue range: 1-437 / Chain - Source name: PDB / Chain - Initial model type: experimental model
SoftwareName: Coot
RefinementSpace: REAL / Protocol: FLEXIBLE FIT / Target criteria: Cross-correlation
Output model

PDB-9bp6:
Structure of alpha1B and betaI/IVb microtubule bound to GMPCPP

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