Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 38.84 kDa 
• Atom Count: 2376 
• Modelled Residue Count: 287 
• Deposited Residue Count: 330 
• Unique protein chains: 1

1S5K

Aminoglycoside N-Acetyltransferase AAC(6')-Iy in Complex with CoA and N-terminal His(6)-tag (crystal form 1)

• PDB DOI: 10.2210/pdb1S5K/pdb

• Classification: TRANSFERASE
• Organism(s): Salmonella enterica subsp. enterica serovar Enteritidis
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2004-01-21 Released: 2004-05-18 
• Deposition Author(s): Vetting, M.W., Magnet, S., Nieves, E., Roderick, S.L., Blanchard, J.S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.245 
• R-Value Work: 0.182 
• R-Value Observed: 0.182 

Literature

A bacterial acetyltransferase capable of regioselective N-acetylation of antibiotics and histones

Vetting, M.W., Magnet, S., Nieves, E., Roderick, S.L., Blanchard, J.S.

(2004) Chem Biol 11: 565-573

• PubMed: 15123251 
• DOI: 10.1016/j.chembiol.2004.03.017
• Primary Citation of Related Structures:  
  1S3Z, 1S5K, 1S60


• PubMed Abstract: 
  

The Salmonella enterica chromosomally encoded AAC(6')-Iy has been shown to confer broad aminoglycoside resistance in strains in which the structural gene is expressed. The three-dimensional structures reported place the enzyme in the large Gcn5-related N-acetyltransferase (GNAT) superfamily. The structure of the CoA-ribostamycin ternary complex allows us to propose a chemical mechanism for the reaction, and comparison with the Mycobacterium tuberculosis AAC(2')-CoA-ribostamycin complex allows us to define how regioselectivity of acetylation is achieved. The AAC(6')-Iy dimer is most structurally similar to the Saccharomyces cerevisiae Hpa2-encoded histone acetyltransferase. We demonstrate that AAC(6')-Iy catalyzes both acetyl-CoA-dependent self-alpha-N-acetylation and acetylation of eukaryotic histone proteins and the human histone H3 N-terminal peptide. These structural and catalytic similarities lead us to propose that chromosomally encoded bacterial acetyltransferases, including those functionally identified as aminoglycoside acetyltransferases, are the evolutionary progenitors of the eukaryotic histone acetyltransferases.

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Related Citations: 

• Kinetic and mutagenic characterization of the chromosomally encoded Salmonella enterica AAC(6')-Iy aminoglycoside N-acetyltransferase
  Magnet, S., Lambert, T., Courvalin, P., Blanchard, J.
  (2001) Biochemistry 40: 3700

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Organizational Affiliation: 

Department of Biochemistry, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461 USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
aminoglycoside 6'-N-acetyltransferase	A, B	165	Salmonella enterica subsp. enterica serovar Enteritidis	Mutation(s): 0  EC: 2.3.1.82
UniProt
Find proteins for Q9R381 (Salmonella enteritidis) Explore Q9R381  Go to UniProtKB:  Q9R381

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
COA	D [auth A], F [auth B]	COENZYME A C21 H36 N7 O16 P3 S RGJOEKWQDUBAIZ-IBOSZNHHSA-N
SO4	C [auth A], E [auth B]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.245 
• R-Value Work: 0.182 
• R-Value Observed: 0.182 
• Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 62.881	α = 90
b = 62.881	β = 90
c = 157.386	γ = 120

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-01-21 
• Released Date: 2004-05-18 
Deposition Author(s): Vetting, M.W., Magnet, S., Nieves, E., Roderick, S.L., Blanchard, J.S.

Revision History  

• Version 1.0: 2004-05-18
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance