1Q2D

Crystal Structure of Tetrahymena GCN5 With Bound Coenzyme A and a 19-residue p53 peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.247 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Molecular basis for GCN5/PCAF histone acetyltransferase selectivity for histone and nonhistone substrates

Poux, A.N.Marmorstein, R.

(2003) Biochemistry 42: 14366-14374

  • DOI: 10.1021/bi035632n

  • PubMed Abstract: 
  • Histone acetyltransferase (HAT) proteins often exhibit a high degree of specificity for lysine-bearing protein substrates. We have previously reported on the structure of the Tetrahymena Gcn5 HAT protein (tGcn5) bound to its preferred histone H3 subs ...

    Histone acetyltransferase (HAT) proteins often exhibit a high degree of specificity for lysine-bearing protein substrates. We have previously reported on the structure of the Tetrahymena Gcn5 HAT protein (tGcn5) bound to its preferred histone H3 substrate, revealing the mode of substrate binding by the Gcn5/PCAF family of HAT proteins. Interestingly, the Gcn5/PCAF HAT family has a remarkable ability to acetylate lysine residues within diverse cognate sites such as those found around lysines 14, 8, and 320 of histones H3, H4, and p53, respectively. To investigate the molecular basis for this, we now report on the crystal structures of tGcn5 bound to 19-residue histone H4 and p53 peptides. A comparison of these structures with tGcn5 bound to histone H3 reveals that the Gcn5/PCAF HATs can accommodate divergent substrates by utilizing analogous interactions with the lysine target and two C-terminal residues with a related chemical nature, suggesting that these interactions play a general role in Gcn5/PCAF substrate binding selectivity. In contrast, while the histone H3 complex shows extensive interactions with tGcn5 and peptide residues N-terminal to the target lysine, the corresponding residues in histone H4 and p53 are disordered, suggesting that the N-terminal substrate region plays an important role in the enhanced affinity of the Gcn5/PCAF HAT proteins for histone H3. Together, these studies provide a framework for understanding the substrate selectivity of HAT proteins.


    Organizational Affiliation

    The Wistar Institute, Philadelphia, Pennsylvania 19104, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
histone acetyltransferase GCN5
A
162Tetrahymena thermophilaN/A
Find proteins for Q27198 (Tetrahymena thermophila)
Go to UniProtKB:  Q27198
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
19-mer peptide fragment from p53 Tumor Suppressor
B
19N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
COA
Query on COA

Download SDF File 
Download CCD File 
A
COENZYME A
C21 H36 N7 O16 P3 S
RGJOEKWQDUBAIZ-IBOSZNHHSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.247 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 64.740α = 90.00
b = 64.740β = 90.00
c = 96.413γ = 120.00
Software Package:
Software NamePurpose
AMoREphasing
CCP4data scaling
SCALAdata scaling
CNSrefinement
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-08-03
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance