Document Detail

Structure of an acetyl-CoA binding protein from Staphylococcus aureus representing a novel subfamily of GCN5-related N-acetyltransferase-like proteins.
MedLine Citation:
PMID:  18709443     Owner:  NLM     Status:  MEDLINE    
We have determined the solution NMR structure of SACOL2532, a putative GCN5-like N-acetyltransferase (GNAT) from Staphylococcus aureus. SACOL2532 was shown to bind both CoA and acetyl-CoA, and structures with and without bound CoA were determined. Based on analysis of the structure and sequence, a subfamily of small GCN5-related N-acetyltransferase (GNAT)-like proteins can be defined. Proteins from this subfamily, which is largely congruent with COG2388, are characterized by a cysteine residue in the acetyl-CoA binding site near the acetyl group, by their small size in relation to other GNATs, by a lack of obvious substrate binding site, and by a distinct conformation of bound CoA in relation to other GNATs. Subfamily members are found in many bacterial and eukaryotic genomes, and in some archaeal genomes. Whereas other GNATs transfer the acetyl group of acetyl-CoA directly to an aliphatic amine, the presence of the conserved cysteine residue suggests that proteins in the COG2388 GNAT-subfamily transfer an acetyl group from acetyl-CoA to one or more presently unidentified aliphatic amines via an acetyl (cysteine) enzyme intermediate. The apparent absence of a substrate-binding region suggests that the substrate is a macromolecule, such as another protein, or that a second protein subunit providing a substrate-binding region must combine with SACOL2532 to make a fully functional N-acetyl transferase.
John R Cort; Theresa A Ramelot; Diana Murray; Thomas B Acton; Li-Chung Ma; Rong Xiao; Gaetano T Montelione; Michael A Kennedy
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2008-08-16
Journal Detail:
Title:  Journal of structural and functional genomics     Volume:  9     ISSN:  1345-711X     ISO Abbreviation:  J. Struct. Funct. Genomics     Publication Date:  2008 Dec 
Date Detail:
Created Date:  2008-12-03     Completed Date:  2009-04-02     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101128185     Medline TA:  J Struct Funct Genomics     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  7-20     Citation Subset:  IM    
Washington State University Tri-Cities, Richland, WA 99354, USA,
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MeSH Terms
Acetyl Coenzyme A / metabolism
Acetyl-CoA C-Acetyltransferase / chemistry,  genetics*,  metabolism*
Amino Acid Sequence
Bacterial Proteins / chemistry,  genetics,  metabolism*
Coenzyme A / metabolism
Conserved Sequence
Magnetic Resonance Spectroscopy
Models, Molecular
Molecular Sequence Data
Protein Conformation
Sequence Alignment
Sequence Homology, Amino Acid
Staphylococcus aureus / enzymology*,  genetics*
Grant Support
Reg. No./Substance:
0/Bacterial Proteins; 0/Ligands; 72-89-9/Acetyl Coenzyme A; 85-61-0/Coenzyme A; EC C-Acetyltransferase

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