6E7C

14-pf 3-start GMPCPP-human alpha1B/beta2B microtubules

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.65 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Human beta-Tubulin Isotypes Can Regulate Microtubule Protofilament Number and Stability.

Ti, S.C., Alushin, G.M., Kapoor, T.M.

(2018) Dev Cell 47: 175

  • DOI: 10.1016/j.devcel.2018.08.014
  • Primary Citation of Related Structures:  
    6E7C, 6E7B

  • PubMed Abstract: 

    • Cell biological studies have shown that protofilament number, a fundamental feature of microtubules, can correlate with the expression of different tubulin isotypes. However, it is not known if tubulin isotypes directly control this basic microtubule pro ...

    Cell biological studies have shown that protofilament number, a fundamental feature of microtubules, can correlate with the expression of different tubulin isotypes. However, it is not known if tubulin isotypes directly control this basic microtubule property. Here, we report high-resolution cryo-EM reconstructions (3.5-3.65 Å) of purified human α1B/β3 and α1B/β2B microtubules and find that the β-tubulin isotype can determine protofilament number. Comparisons of atomic models of 13- and 14-protofilament microtubules reveal how tubulin subunit plasticity, manifested in "accordion-like" distributed structural changes, can accommodate distinct lattice organizations. Furthermore, compared to α1B/β3 microtubules, α1B/β2B filaments are more stable to passive disassembly and against depolymerization by MCAK or chTOG, microtubule-associated proteins with distinct mechanisms of action. Mixing tubulin isotypes in different proportions results in microtubules with protofilament numbers and stabilities intermediate to those of isotypically pure filaments. Together, our findings indicate that microtubule protofilament number and stability can be controlled through β-tubulin isotype composition.

    Organizational Affiliation: 

    Laboratory of Chemistry and Cell Biology, The Rockefeller University, 1230 York Avenue, New York, NY 10065, USA. Electronic address: kapoor@rockefeller.edu.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Tubulin beta-2B chain B426Homo sapiensMutation(s): 0 
Gene Names: TUBB2B
Find proteins for Q9BVA1 (Homo sapiens)
Explore Q9BVA1 
Go to UniProtKB:  Q9BVA1
NIH Common Fund Data Resources
PHAROS:  Q9BVA1
GTEx:  ENSG00000137285
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Tubulin alpha-1B chain A437Homo sapiensMutation(s): 0 
Gene Names: TUBA1B
Find proteins for P68363 (Homo sapiens)
Explore P68363 
Go to UniProtKB:  P68363
NIH Common Fund Data Resources
PHAROS:  P68363
GTEx:  ENSG00000123416
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GTP
Query on GTP
Download Ideal Coordinates CCD File 
A
GUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O14 P3
XKMLYUALXHKNFT-UUOKFMHZSA-N		 Ligand Interaction
G2P
Query on G2P
Download Ideal Coordinates CCD File 
B
PHOSPHOMETHYLPHOSPHONIC ACID GUANYLATE ESTER
C11 H18 N5 O13 P3
GXTIEXDFEKYVGY-KQYNXXCUSA-N		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.65 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

Structure Validation

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View more in-depth experimental data

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)United StatesGM65933
National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)United States7DP5OD017885

Revision History 

  • Version 1.0: 2018-10-10
    Type: Initial release
  • Version 1.1: 2018-11-07
    Changes: Data collection, Database references, Structure summary
  • Version 1.2: 2019-12-18
    Changes: Author supporting evidence