Biological Assembly 1  

 3D View: Structure | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 19.37 kDa 
• Atom Count: 1456 
• Residue Count: 160 
• Unique protein chains: 1

1QST

CRYSTAL STRUCTURE OF TETRAHYMENA GCN5

• DOI: 10.2210/pdb1QST/pdb

• Classification: TRANSFERASE
• Organism(s): Tetrahymena thermophila
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1999-06-23 Released: 1999-09-08 
• Deposition Author(s): Rojas, J.R., Trievel, R.C., Zhou, J., Mo, Y., Li, X., Berger, S.L., David Allis, C., Marmorstein, R.

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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 

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

• PubMed: 10485713 
• DOI: 10.1038/43487
• Primary Citation of Related Structures:  
  1QSR, 1QSN, 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.

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
TGCN5 HISTONE ACETYL TRANSFERASE	A	160	Tetrahymena thermophila	Mutation(s): 0  EC: 2.3.1.48
Find proteins for Q27198 (Tetrahymena thermophila) Explore Q27198  Go to UniProtKB:  Q27198

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
EPE	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 = 64.1	α = 90
b = 64.1	β = 90
c = 97.8	γ = 120

Software Package:

Software Name	Purpose
PHASES	phasing
X-PLOR	refinement
MOSFLM	data reduction
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1999-06-23 
• Released Date: 1999-09-08 
Deposition Author(s): Rojas, J.R., Trievel, R.C., Zhou, J., Mo, Y., Li, X., Berger, S.L., David Allis, C., Marmorstein, R.

Revision History 

• 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