3FTT: Crystal Structure of the galactoside O-acetyltransferase from Staphylococcus aureus

Citation:
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) is a major cause of a myriad of insidious and intractable infections in humans, especially in patients with compromised immune systems and children. Here, we report the apo- and CoA-bound crystal structures of a member of the galactoside acetyltransferase superfamily from methicillin-resistant S. aureus SACOL2570 which was recently shown to be down regulated in S. aureus grown in the presence of fusidic acid, an antibiotic used to treat MRSA infections. SACOL2570 forms a homotrimer in solution, as confirmed by small-angle X-ray scattering and dynamic light scattering. The protein subunit consists of an N-terminal alpha-helical domain connected to a C-terminal LbetaH domain. CoA binds in the active site formed by the residues from adjacent LbetaH domains. After determination of CoA-bound structure, molecular dynamics simulations were performed to model the binding of AcCoA. Binding of both AcCoA and CoA to SACOL2570 was verified by isothermal titration calorimetry. SACOL2570 most likely acts as an acetyltransferase, using AcCoA as an acetyl group donor and an as-yet-undetermined chemical moiety as an acceptor. SACOL2570 was recently used as a scaffold for mutations that lead the generation of cage-like assemblies, and has the potential to be used for the generation of more complex nanostructures.
PDB ID: 3FTTDownload
MMDB ID: 69996
PDB Deposition Date: 2009/1/13
Updated in MMDB: 2017/11
Experimental Method:
x-ray diffraction
Resolution: 1.6  Å
Source Organism:
Similar Structures:
Biological Unit for 3FTT: trimeric; determined by author and by software (PISA)
Molecular Components in 3FTT
Label Count Molecule
Proteins (3 molecules)
3
Putative Acetyltransferase Sacol2570
Molecule annotation
* Click molecule labels to explore molecular sequence information.

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