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- PDB-6u0h: Tubulin lattice of the ciliary doublet microtubule from Tetrahyme... -

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Basic information

Entry
Database: PDB / ID: 6u0h
TitleTubulin lattice of the ciliary doublet microtubule from Tetrahymena thermophila
Components
  • Tubulin alpha chain
  • Tubulin beta chain
KeywordsSTRUCTURAL PROTEIN / cilia / doublet / axoneme / microtubule inner protein
Function / homology
Function and homology information


Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / structural constituent of cytoskeleton / microtubule cytoskeleton organization / mitotic cell cycle / microtubule / hydrolase activity / GTPase activity / GTP binding / metal ion binding / cytoplasm
Similarity search - Function
Tubulin-beta mRNA autoregulation signal. / Alpha tubulin / 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-beta mRNA autoregulation signal. / Alpha tubulin / 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
GUANOSINE-5'-DIPHOSPHATE / GUANOSINE-5'-TRIPHOSPHATE / Tubulin alpha chain / Tubulin beta chain
Similarity search - Component
Biological speciesTetrahymena thermophila (eukaryote)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.3 Å
AuthorsIchikawa, M. / Khalifa, A.A.Z. / Vargas, J. / Basu, K. / Bui, K.H.
Funding support Canada, 3items
OrganizationGrant numberCountry
Natural Sciences and Engineering Research Council (NSERC, Canada)DG69462 Canada
Canadian Institutes of Health Research (CIHR)PG388933 Canada
Natural Sciences and Engineering Research Council (NSERC, Canada)RGPIN-2018-04813 Canada
CitationJournal: Proc Natl Acad Sci U S A / Year: 2019
Title: Tubulin lattice in cilia is in a stressed form regulated by microtubule inner proteins.
Authors: Muneyoshi Ichikawa / Ahmad Abdelzaher Zaki Khalifa / Shintaroh Kubo / Daniel Dai / Kaustuv Basu / Mohammad Amin Faghfor Maghrebi / Javier Vargas / Khanh Huy Bui /
Abstract: Cilia, the hair-like protrusions that beat at high frequencies to propel a cell or move fluid around are composed of radially bundled doublet microtubules. In this study, we present a near-atomic ...Cilia, the hair-like protrusions that beat at high frequencies to propel a cell or move fluid around are composed of radially bundled doublet microtubules. In this study, we present a near-atomic resolution map of the doublet microtubule by cryoelectron microscopy. The map demonstrates that the network of microtubule inner proteins weaves into the tubulin lattice and forms an inner sheath. From mass spectrometry data and de novo modeling, we identified Rib43a proteins as the filamentous microtubule inner proteins in the protofilament ribbon region. The Rib43a-tubulin interaction leads to an elongated tubulin dimer distance every 2 dimers. In addition, the tubulin lattice structure with missing microtubule inner proteins (MIPs) by sarkosyl treatment shows significant longitudinal compaction and lateral angle change between protofilaments. These results are evidence that the MIPs directly affect and stabilize the tubulin lattice. It suggests that the doublet microtubule is an intrinsically stressed filament and that this stress could be manipulated in the regulation of ciliary waveforms.
History
DepositionAug 14, 2019Deposition site: RCSB / Processing site: RCSB
Revision 1.0Sep 25, 2019Provider: repository / Type: Initial release
Revision 1.1Oct 2, 2019Group: Data collection / Database references / Category: citation / citation_author
Item: _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID
Revision 1.2Oct 16, 2019Group: Data collection / Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last
Revision 1.3Jan 15, 2020Group: Author supporting evidence / Category: pdbx_audit_support / Item: _pdbx_audit_support.funding_organization
Revision 1.4Mar 20, 2024Group: Data collection / Database references / Derived calculations
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / pdbx_struct_oper_list
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _pdbx_struct_oper_list.name / _pdbx_struct_oper_list.symmetry_operation / _pdbx_struct_oper_list.type

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Structure visualization

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Assembly

Deposited unit
A: Tubulin alpha chain
B: Tubulin beta chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)100,2475
Polymers99,2572
Non-polymers9913
Water00
1
A: Tubulin alpha chain
B: Tubulin beta chain
hetero molecules
x 138


Theoretical massNumber of molelcules
Total (without water)13,834,141690
Polymers13,697,426276
Non-polymers136,715414
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation137
2


  • Idetical with deposited unit
  • point asymmetric unit
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
SymmetryPoint symmetry: (Schoenflies symbol: C1 (asymmetric))

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Components

#1: Protein Tubulin alpha chain / Alpha-tubulin


Mass: 49639.035 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Tetrahymena thermophila (eukaryote) / Production host: Tetrahymena thermophila (eukaryote) / References: UniProt: P41351
#2: Protein Tubulin beta chain / Beta-tubulin


Mass: 49617.676 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Tetrahymena thermophila (eukaryote) / Gene: BTU1, BTU2 / Production host: Tetrahymena thermophila (eukaryote) / References: UniProt: P41352
#3: Chemical ChemComp-GTP / GUANOSINE-5'-TRIPHOSPHATE


Mass: 523.180 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C10H16N5O14P3 / Comment: GTP, energy-carrying molecule*YM
#4: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg
#5: Chemical ChemComp-GDP / GUANOSINE-5'-DIPHOSPHATE


Type: RNA linking / Mass: 443.201 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C10H15N5O11P2 / Comment: GDP, energy-carrying molecule*YM
Has ligand of interestN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: FILAMENT / 3D reconstruction method: single particle reconstruction

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Sample preparation

Component
IDNameTypeEntity IDParent-IDSource
148nm-repeat of microtubule doubletORGANELLE OR CELLULAR COMPONENT#1-#20NATURAL
2Tubulin latticeCOMPLEX#1-#21NATURAL
Molecular weight
IDEntity assembly-IDExperimental value
11NO
21NO
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-IDStrainCellular locationOrganelle
21Tetrahymena thermophila (eukaryote)5911SB255ciliacilia
32Tetrahymena thermophila (eukaryote)5911SB255ciliacilia
Buffer solutionpH: 7.4
SpecimenConc.: 2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R2/2
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 298 K / Details: Blot force 3 for 5 seconds

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 59000 X / Nominal defocus max: 3800 nm / Nominal defocus min: 1200 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 1.4 sec. / Electron dose: 45 e/Å2 / Detector mode: INTEGRATING / Film or detector model: FEI FALCON II (4k x 4k) / Num. of real images: 5983
Image scansMovie frames/image: 7 / Used frames/image: 1-7

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Processing

EM software
IDNameVersionCategoryDetails
1EMAN22particle selectionEMAN2 e2helixboxer
2EPU1.6image acquisition
4RELION3CTF correction
7UCSF Chimera1.4model fitting
9SPIDER19.02initial Euler assignment
10RELION3final Euler assignment
11FREALIGN9.03final Euler assignment
12FREALIGN9.03classification
13RELION33D reconstruction
14PHENIX1.14model refinement
15Coot0.8.7model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 60386
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 4.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 60386 / Algorithm: BACK PROJECTION / Details: Relion Gold Standard Refinement / Num. of class averages: 1 / Symmetry type: POINT
Atomic model buildingB value: 190 / Protocol: AB INITIO MODEL / Space: REAL

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