5JCO

Structure and dynamics of single-isoform recombinant neuronal human tubulin


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structure and Dynamics of Single-isoform Recombinant Neuronal Human Tubulin.

Vemu, A.Atherton, J.Spector, J.O.Szyk, A.Moores, C.A.Roll-Mecak, A.

(2016) J.Biol.Chem. 291: 12907-12915

  • DOI: 10.1074/jbc.C116.731133

  • PubMed Abstract: 
  • Microtubules are polymers that cycle stochastically between polymerization and depolymerization, i.e. they exhibit "dynamic instability." This behavior is crucial for cell division, motility, and differentiation. Although studies in the last decade h ...

    Microtubules are polymers that cycle stochastically between polymerization and depolymerization, i.e. they exhibit "dynamic instability." This behavior is crucial for cell division, motility, and differentiation. Although studies in the last decade have made fundamental breakthroughs in our understanding of how cellular effectors modulate microtubule dynamics, analysis of the relationship between tubulin sequence, structure, and dynamics has been held back by a lack of dynamics measurements with and structural characterization of homogeneous isotypically pure engineered tubulin. Here, we report for the first time the cryo-EM structure and in vitro dynamics parameters of recombinant isotypically pure human tubulin. α1A/βIII is a purely neuronal tubulin isoform. The 4.2-Å structure of post-translationally unmodified human α1A/βIII microtubules shows overall similarity to that of heterogeneous brain microtubules, but it is distinguished by subtle differences at polymerization interfaces, which are hot spots for sequence divergence between tubulin isoforms. In vitro dynamics assays show that, like mosaic brain microtubules, recombinant homogeneous microtubules undergo dynamic instability, but they polymerize slower and have fewer catastrophes. Interestingly, we find that epitaxial growth of α1A/βIII microtubules from heterogeneous brain seeds is inefficient but can be fully rescued by incorporating as little as 5% of brain tubulin into the homogeneous α1A/βIII lattice. Our study establishes a system to examine the structure and dynamics of mammalian microtubules with well defined tubulin species and is a first and necessary step toward uncovering how tubulin genetic and chemical diversity is exploited to modulate intrinsic microtubule dynamics.


    Organizational Affiliation

    From the Cell Biology and Biophysics Unit, NINDS, and.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Tubulin beta-3 chain
K, I, J, C, D, L
426Homo sapiensMutation(s): 0 
Gene Names: TUBB3 (TUBB4)
Find proteins for Q13509 (Homo sapiens)
Go to Gene View: TUBB3
Go to UniProtKB:  Q13509
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Tubulin alpha-1A chain
H, E, F, A, B, G
437Homo sapiensMutation(s): 0 
Gene Names: TUBA1A (TUBA3)
Find proteins for Q71U36 (Homo sapiens)
Go to Gene View: TUBA1A
Go to UniProtKB:  Q71U36
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GTP
Query on GTP

Download SDF File 
Download CCD File 
A, B, E, F, G, H
GUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O14 P3
XKMLYUALXHKNFT-UUOKFMHZSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J, K, L
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
G2P
Query on G2P

Download SDF File 
Download CCD File 
C, D, I, J, K, L
PHOSPHOMETHYLPHOSPHONIC ACID GUANYLATE ESTER
C11 H18 N5 O13 P3
GXTIEXDFEKYVGY-KQYNXXCUSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Medical Research Council (United Kingdom)United Kingdom--
National Institutes of Health/National Institute of Neurological Disorders and StrokeUnited States--
National Institutes of Health/National Heart, Lung, and Blood InstituteUnited States--

Revision History 

  • Version 1.0: 2016-05-04
    Type: Initial release
  • Version 1.1: 2016-05-11
    Type: Database references
  • Version 1.2: 2016-06-29
    Type: Database references
  • Version 1.3: 2017-09-13
    Type: Author supporting evidence, Data collection, Database references