title: Purification, crystallization and preliminary X-ray analysis of the aminoglycoside-6'-acetyltransferase AAC(6')-Im.
abstract: Bacterial resistance to the aminoglycoside antibiotics is primarily the result of enzymatic deactivation of the drugs. The aminoglycoside N-acetyltransferases (AACs) are a large family of bacterial enzymes that are responsible for coenzyme-A-facilitated acetylation of aminoglycosides. The gene encoding one of these enzymes, AAC(6')-Im, has been cloned and the protein (comprising 178 amino-acid residues) was expressed in Escherichia coli, purified and crystallized as the kanamycin complex. Synchrotron diffraction data to approximately 2.0 Å resolution were collected from a crystal of this complex on beamline BL12-2 at SSRL (Stanford, California, USA). The crystals belonged to the hexagonal space group P6(5), with approximate unit-cell parameters a = 107.75, c = 37.33 Å, and contained one molecule in the asymmetric unit. Structure determination is under way using molecular replacement.
authors.affiliation: Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, USA.
authors.forename: Marta
authors.initials: M
authors.lastname: Toth
authors.forename: Sergei B
authors.initials: SB
authors.lastname: Vakulenko
authors.forename: Clyde A
authors.initials: CA
authors.lastname: Smith
mesh_terms: D000123:Acetyltransferases / Q000737:chemistry* / Q000302:isolation & purification; D000595:Amino Acid Sequence; D003460:Crystallization; D018360:Crystallography, X-Ray; D016984:Enterococcus faecium / Q000201:enzymology*; D008969:Molecular Sequence Data; D016415:Sequence Alignment
chemical_list: D000123:Acetyltransferases; C019681:aminoglycoside acetyltransferase