tubulin acetyltransferase complex with bisubstrate analog

Experimental Data Snapshot

  • Resolution: 1.35 Å
  • R-Value Free: 0.168 
  • R-Value Work: 0.131 
  • R-Value Observed: 0.133 

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This is version 1.4 of the entry. See complete history


Molecular basis for age-dependent microtubule acetylation by tubulin acetyltransferase.

Szyk, A.Deaconescu, A.M.Spector, J.Goodman, B.Valenstein, M.L.Ziolkowska, N.E.Kormendi, V.Grigorieff, N.Roll-Mecak, A.

(2014) Cell 157: 1405-1415

  • DOI: https://doi.org/10.1016/j.cell.2014.03.061
  • Primary Citation of Related Structures:  
    4PK2, 4PK3

  • PubMed Abstract: 

    Acetylation of α-tubulin Lys40 by tubulin acetyltransferase (TAT) is the only known posttranslational modification in the microtubule lumen. It marks stable microtubules and is required for polarity establishment and directional migration. Here, we elucidate the mechanistic underpinnings for TAT activity and its preference for microtubules with slow turnover. 1.35 Å TAT cocrystal structures with bisubstrate analogs constrain TAT action to the microtubule lumen and reveal Lys40 engaged in a suboptimal active site. Assays with diverse tubulin polymers show that TAT is stimulated by microtubule interprotofilament contacts. Unexpectedly, despite the confined intraluminal location of Lys40, TAT efficiently scans the microtubule bidirectionally and acetylates stochastically without preference for ends. First-principles modeling and single-molecule measurements demonstrate that TAT catalytic activity, not constrained luminal diffusion, is rate limiting for acetylation. Thus, because of its preference for microtubules over free tubulin and its modest catalytic rate, TAT can function as a slow clock for microtubule lifetimes.

  • Organizational Affiliation

    Cell Biology and Biophysics Unit, Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, Bethesda, MD 20892, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Alpha-tubulin N-acetyltransferase 1198Homo sapiensMutation(s): 0 
Gene Names: ATAT1C6orf134MEC17Nbla00487
UniProt & NIH Common Fund Data Resources
Find proteins for Q5SQI0 (Homo sapiens)
Explore Q5SQI0 
Go to UniProtKB:  Q5SQI0
GTEx:  ENSG00000137343 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5SQI0
Sequence Annotations
  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
ACETYL-SER-(N-PROPANOYL-LYS)-ASP--THR-NH2 PEPTIDE6synthetic constructMutation(s): 0 
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on COA

Download Ideal Coordinates CCD File 
C21 H36 N7 O16 P3 S
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on PRK
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.124α = 90
b = 52.483β = 106.83
c = 50.285γ = 90
Software Package:
Software NamePurpose

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)United States1ZIANS003122-04

Revision History  (Full details and data files)

  • Version 1.0: 2014-08-13
    Type: Initial release
  • Version 1.1: 2015-02-25
    Changes: Other
  • Version 1.2: 2017-09-20
    Changes: Advisory, Author supporting evidence, Derived calculations, Other, Source and taxonomy
  • Version 1.3: 2019-12-18
    Changes: Author supporting evidence
  • Version 1.4: 2023-12-27
    Changes: Data collection, Database references, Refinement description