Bellais Samuel, Naas Thierry, Nordmann Patrice
Service de Bactériologie-Virologie, Hôpital de Bicêtre, Assistance Publique/Hôpitaux de Paris, Faculté de Médecine Paris-Sud, 94275 Le Kremlin-Bicêtre Cedex, France.
Antimicrob Agents Chemother. 2002 Apr;46(4):966-70. doi: 10.1128/AAC.46.4.966-970.2002.
Antibiotic susceptibility testing by disk diffusion of a Chryseobacterium gleum isolate, strain CIP 103039, showed a typical synergy image between clavulanic acid and expanded-spectrum cephalosporins. Shotgun cloning gave a recombinant plasmid in Escherichia coli that produced a beta-lactamase, CGA-1, with a pI value of 8.9 that conferred resistance to most penicillins (except ureidopenicillins) and narrow-spectrum cephalosporins and an intermediate susceptibility to expanded-spectrum cephalosporins and aztreonam. The CGA-1 amino acid sequence shared only 60% amino acid identity with CME-1 and CME-2 from Chryseobacterium meningosepticum, the most closely related beta-lactamases. CGA-1 was very likely chromosome encoded. It is a novel member of the PER subgroup of Ambler class A beta-lactamases (Bush functional group 2be).
通过纸片扩散法对一株戈氏金黄杆菌(Chryseobacterium gleum)分离株(菌株CIP 103039)进行抗生素敏感性测试,结果显示克拉维酸与广谱头孢菌素之间呈现典型的协同作用图像。鸟枪法克隆在大肠杆菌中获得了一个重组质粒,该质粒产生一种β-内酰胺酶CGA-1,其pI值为8.9,对大多数青霉素(除脲基青霉素外)和窄谱头孢菌素具有抗性,对广谱头孢菌素和氨曲南具有中等敏感性。CGA-1的氨基酸序列与来自脑膜败血金黄杆菌(Chryseobacterium meningosepticum)的最密切相关的β-内酰胺酶CME-1和CME-2仅具有60%的氨基酸同一性。CGA-1很可能是染色体编码的。它是安布勒A类β-内酰胺酶PER亚组(布什功能组2be)的一个新成员。