Crystal structure of a GCN5-related N-acetyltransferase: Serratia marcescens aminoglycoside 3-N-acetyltransferase

Cell. 1998 Aug 21;94(4):439-49. doi: 10.1016/s0092-8674(00)81585-8.


The X-ray structure of a canonical GCN5-related N-acetyltransferase (GNAT), Serratia marcescens aminoglycoside 3-N-acetyltransferase, bound to coenzyme A (CoA) has been determined at 2.3 A resolution. The single domain alpha/beta protein resembles a cupped right hand wrapped around a cylinder and consists of a highly curved, six-stranded beta sheet of mixed polarity that is sandwiched between four alpha helices. The structure includes all four conserved GNAT motifs (C, D, A, and B) and represents the catalytic core of this large enzyme superfamily. Acetyl CoA recognition is mediated by a betaalpha structure derived from GNAT motif A, which presents an invariant Arg/Gln-X-X-Gly-X-Gly/Ala segment for hydrogen bonding with the cofactor. Motif B contributes acidic residues to the binding site for the positively charged antibiotic substrate.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Acetyltransferases / chemistry*
  • Acetyltransferases / metabolism
  • Amino Acid Sequence
  • Aminoglycosides / metabolism
  • Arylamine N-Acetyltransferase / chemistry
  • Binding Sites
  • Coenzyme A / chemistry*
  • Coenzyme A / metabolism
  • Conserved Sequence
  • Crystallography, X-Ray
  • DNA-Binding Proteins*
  • Drug Resistance, Microbial
  • Fungal Proteins / chemistry
  • Histone Acetyltransferases
  • Hydrogen Bonding
  • Models, Molecular
  • Molecular Sequence Data
  • Multigene Family
  • Protein Kinases / chemistry
  • Protein Structure, Secondary
  • Saccharomyces cerevisiae Proteins*
  • Sequence Homology, Amino Acid
  • Serratia marcescens / enzymology*


  • Aminoglycosides
  • DNA-Binding Proteins
  • Fungal Proteins
  • Saccharomyces cerevisiae Proteins
  • Acetyltransferases
  • GCN5 protein, S cerevisiae
  • Histone Acetyltransferases
  • Arylamine N-Acetyltransferase
  • aminoglycoside N(3')-acetyltransferase
  • Protein Kinases
  • Coenzyme A

Associated data

  • PDB/1BO4