1QST

CRYSTAL STRUCTURE OF TETRAHYMENA GCN5


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.244 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Structure of Tetrahymena GCN5 bound to coenzyme A and a histone H3 peptide.

Rojas, J.R.Trievel, R.C.Zhou, J.Mo, Y.Li, X.Berger, S.L.Allis, C.D.Marmorstein, R.

(1999) Nature 401: 93-98

  • DOI: https://doi.org/10.1038/43487
  • Primary Citation of Related Structures:  
    1QSN, 1QSR, 1QST

  • PubMed Abstract: 

    Gene activation is a highly regulated process that requires the coordinated action of proteins to relieve chromatin repression and to promote transcriptional activation. Nuclear histone acetyltransferase (HAT) enzymes provide a mechanistic link between chromatin destabilization and gene activation by acetylating the epsilon-amino group of specific lysine residues within the aminoterminal tails of core histones to facilitate access to DNA by transcriptional activators. Here we report the high-resolution crystal structure of the HAT domain of Tetrahymena GCN5 (tGCN5) bound with both its physiologically relevant ligands, coenzyme A (CoA) and a histone H3 peptide, and the structures of nascent tGCN5 and a tGCN5/acetyl-CoA complex. Our structural data reveal histone-binding specificity for a random-coil structure containing a G-K-X-P recognition sequence, and show that CoA is essential for reorienting the enzyme for histone binding. Catalysis appears to involve water-mediated proton extraction from the substrate lysine by a glutamic acid general base and a backbone amide that stabilizes the transition-state reaction intermediate. Comparison with related N-acetyltransferases indicates a conserved structural framework for CoA binding and catalysis, and structural variability in regions associated with substrate-specific binding.


  • Organizational Affiliation

    The Wistar Institute, Department of Chemistry, University of Pennsylvania, Philadelphia 19104, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TGCN5 HISTONE ACETYL TRANSFERASE160Tetrahymena thermophilaMutation(s): 0 
EC: 2.3.1.48
UniProt
Find proteins for Q27198 (Tetrahymena thermophila)
Explore Q27198 
Go to UniProtKB:  Q27198
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ27198
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
EPE
Query on EPE

Download Ideal Coordinates CCD File 
B [auth A]4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID
C8 H18 N2 O4 S
JKMHFZQWWAIEOD-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.244 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 64.1α = 90
b = 64.1β = 90
c = 97.8γ = 120
Software Package:
Software NamePurpose
PHASESphasing
X-PLORrefinement
MOSFLMdata reduction
CCP4data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-09-08
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2024-02-14
    Changes: Atomic model, Data collection, Database references, Derived calculations