4QLO

Crystal Structure of homoserine o-acetyltransferase from Staphylococcus aureus

• PDB DOI: https://doi.org/10.2210/pdb4QLO/pdb

• Classification: TRANSFERASE
• Organism(s): Staphylococcus aureus subsp. aureus USA300_TCH1516
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2014-06-12 Released: 2014-08-20 
• Deposition Author(s): Thangavelu, B., Pavlovsky, A.G., Viola, R.E.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.45 Å
• R-Value Free: 
  0.291 (Depositor), 0.290 (DCC) 
• R-Value Work: 
  0.240 (Depositor), 0.240 (DCC) 
• R-Value Observed: 
  0.242 (Depositor) 

Literature

Structure of homoserine O-acetyltransferase from Staphylococcus aureus: the first Gram-positive ortholog structure.

Thangavelu, B., Pavlovsky, A.G., Viola, R.

(2014) Acta Crystallogr Sect F Struct Biol Cryst Commun 70: 1340-1345

• PubMed: 25286936 
• DOI: https://doi.org/10.1107/S2053230X14018664
• Primary Citation of Related Structures:  
  4QLO


• PubMed Abstract: 
  

  Homoserine O-acetyltransferase (HTA) catalyzes the formation of L-O-acetyl-homoserine from L-homoserine through the transfer of an acetyl group from acetyl-CoA. This is the first committed step required for the biosynthesis of methionine in many fungi, Gram-positive bacteria and some Gram-negative bacteria. The structure of HTA from Staphylococcus aureus (SaHTA) has been determined to a resolution of 2.45 Å. The structure belongs to the α/β-hydrolase superfamily, consisting of two distinct domains: a core α/β-domain containing the catalytic site and a lid domain assembled into a helical bundle. The active site consists of a classical catalytic triad located at the end of a deep tunnel. Structure analysis revealed some important differences for SaHTA compared with the few known structures of HTA.

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Organizational Affiliation: 

Department of Chemistry and Biochemistry, The University of Toledo, Toledo, OH 43606, USA.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly 2  

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

Biological assembly 2 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 41.24 kDa 
• Atom Count: 2,688 
• Modelled Residue Count: 327 
• Deposited Residue Count: 360 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
homoserine O-acetyltransferase	A	360	Staphylococcus aureus subsp. aureus USA300_TCH1516	Mutation(s): 0  Gene Names: AZ30_00060, metX, SACOL0012, USA300HOU_0012 EC: 2.3.1.31

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.45 Å
• R-Value Free:  0.291 (Depositor), 0.290 (DCC) 
• R-Value Work:  0.240 (Depositor), 0.240 (DCC) 
• R-Value Observed: 0.242 (Depositor) 

Space Group: P 6₁ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 49.155	α = 90
b = 49.155	β = 90
c = 481.417	γ = 120

Software Package:

Software Name	Purpose
CrystalClear	data collection
BALBES	phasing
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2014-08-20 
Deposition Author(s): Thangavelu, B., Pavlovsky, A.G., Viola, R.E.

Revision History  

• Version 1.0: 2014-08-20
  Type: Initial release
  
• Version 1.1: 2014-12-17
  Changes: Database references
• Version 1.2: 2024-02-28
  Changes: Data collection, Database references