Papagiannitsis Costas C, Tzouvelekis Leonidas S, Tzelepi Eva, Miriagou Vivi
Laboratory of Bacteriology, Hellenic Pasteur Institute, Vas Sofias 127, Athens, Greece.
Antimicrob Agents Chemother. 2007 Oct;51(10):3763-7. doi: 10.1128/AAC.00389-07. Epub 2007 Jul 30.
ACC-4, an omega loop mutant (Val(211)-->Gly) of the Hafnia alvei-derived cephalosporinase ACC-1, was encoded by an Escherichia coli plasmid. The genetic environment of bla(ACC-4) shared similarities with plasmidic regions carrying bla(ACC-1). Kinetics of beta-lactam hydrolysis and levels of resistance to beta-lactams showed that ACC-4 was more effective than ACC-1 against expanded-spectrum cephalosporins.
ACC-4是源自蜂房哈夫尼亚菌的头孢菌素酶ACC-1的一个ω环突变体(Val(211)→Gly),由大肠杆菌质粒编码。bla(ACC-4)的遗传环境与携带bla(ACC-1)的质粒区域具有相似性。β-内酰胺水解动力学和对β-内酰胺的耐药水平表明,ACC-4对超广谱头孢菌素的作用比ACC-1更有效。