6VE7

The inner junction complex of Chlamydomonas reinhardtii doublet microtubule


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report



Literature

The inner junction complex of the cilia is an interaction hub that involves tubulin post-translational modifications.

Khalifa, A.A.Z.Ichikawa, M.Dai, D.Kubo, S.Black, C.Peri, K.McAlear, T.S.Veyron, S.Yang, S.K.Vargas, J.Bechstedt, S.Trempe, J.F.Bui, K.H.

(2020) Elife 9

  • DOI: 10.7554/eLife.52760
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Microtubules are cytoskeletal structures involved in stability, transport and organization in the cell. The building blocks, the α- and β-tubulin heterodimers, form protofilaments that associate laterally into the hollow microtubule. Microtubule also ...

    Microtubules are cytoskeletal structures involved in stability, transport and organization in the cell. The building blocks, the α- and β-tubulin heterodimers, form protofilaments that associate laterally into the hollow microtubule. Microtubule also exists as highly stable doublet microtubules in the cilia where stability is needed for ciliary beating and function. The doublet microtubule maintains its stability through interactions at its inner and outer junctions where its A- and B-tubules meet. Here, using cryo-electron microscopy, bioinformatics and mass spectrometry of the doublets of Chlamydomonas reinhardtii and Tetrahymena thermophila , we identified two new inner junction proteins, FAP276 and FAP106, and an inner junction-associated protein, FAP126, thus presenting the complete answer to the inner junction identity and localization. Our structural study of the doublets shows that the inner junction serves as an interaction hub that involves tubulin post-translational modifications. These interactions contribute to the stability of the doublet and hence, normal ciliary motility.


    Organizational Affiliation

    Centre de Recherche en Biologie Structurale - FRQS, McGill University, Québec, Canada.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Flagellar associated proteinA240Chlamydomonas reinhardtiiMutation(s): 0 
Gene Names: FAP106CHLRE_09g393954v5CHLREDRAFT_137793
Find proteins for A8J098 (Chlamydomonas reinhardtii)
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Go to UniProtKB:  A8J098
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
FAP52B, C633Chlamydomonas reinhardtiiMutation(s): 0 
Gene Names: CHLRE_12g489750v5
Find proteins for A0A2K3D260 (Chlamydomonas reinhardtii)
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Tubulin alpha0, 1, 5, 6, 7, D, E, F, G, L, M, P, S, X, Y, Z, e, f, h, k, m, o, s, y451Chlamydomonas reinhardtiiMutation(s): 0 
Gene Names: TUBA1
Find proteins for P09204 (Chlamydomonas reinhardtii)
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  • Reference Sequence

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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Protein Flattop homologH137Chlamydomonas reinhardtiiMutation(s): 0 
Gene Names: CFAP126FAP126FLTPCHLREDRAFT_190291
Find proteins for A8IVJ1 (Chlamydomonas reinhardtii)
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  • Reference Sequence

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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
Tubulin beta4, 8, 9, I, J, K, N, O, Q, R, T, U, V, a, b, i, j, p, q, r, t, u, v, w443Chlamydomonas reinhardtiiMutation(s): 0 
Gene Names: TUBB1TUBB2
Find proteins for P04690 (Chlamydomonas reinhardtii)
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  • Reference Sequence

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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetails
FAP276W, x86Chlamydomonas reinhardtiiMutation(s): 0 
Gene Names: CHLRE_04g216203v5CHLRE_04g216250v5
Find proteins for A0A2K3DTN6 (Chlamydomonas reinhardtii)
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  • Reference Sequence

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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetails
Cilia- and flagella-associated protein 203, c, g, z190Chlamydomonas reinhardtiiMutation(s): 0 
Gene Names: CFAP20BUG22FAP20CHLREDRAFT_189631
Find proteins for A8IU92 (Chlamydomonas reinhardtii)
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  • Reference Sequence

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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetails
PACRG2, d, l, n307Chlamydomonas reinhardtiiMutation(s): 0 
Gene Names: PACRGCHLRE_02g113400v5
Find proteins for B1B601 (Chlamydomonas reinhardtii)
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
TA1
Query on TA1

Download CCD File 
4, 8, 9, J, V, a, b, i, j, p, q, r, t, u, v, w
TAXOL
C47 H51 N O14
RCINICONZNJXQF-MZXODVADSA-N
 Ligand Interaction
GTP
Query on GTP

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0, 1, 5, 6, 7, D, E, F, G, L, M, P, S, X, Y, Z, e, f, h, k, m, o, s, y
GUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O14 P3
XKMLYUALXHKNFT-UUOKFMHZSA-N
 Ligand Interaction
GDP
Query on GDP

Download CCD File 
4, 8, 9, I, J, K, N, O, Q, R, T, U, V, a, b, i, j, p, q, r, t, u, v, w
GUANOSINE-5'-DIPHOSPHATE
C10 H15 N5 O11 P2
QGWNDRXFNXRZMB-UUOKFMHZSA-N
 Ligand Interaction
MG
Query on MG

Download CCD File 
0, 1, 5, 6, 7, D, E, F, G, L, M, P, S, X, Y, Z, e, f, h, k, m, o, p, s
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Natural Sciences and Engineering Research Council (NSERC, Canada)CanadaRGPIN-2016-04954
Canadian Institutes of Health Research (CIHR)CanadaPJT-156354
Natural Sciences and Engineering Research Council (NSERC, Canada)CanadaRGPIN-2018-04813

Revision History 

  • Version 1.0: 2020-02-05
    Type: Initial release