三种阴沟肠杆菌ampCβ-内酰胺酶基因及其产物的序列与比较分析
Sequence and comparative analysis of three Enterobacter cloacae ampC beta-lactamase genes and their products.
作者信息
Galleni M, Lindberg F, Normark S, Cole S, Honore N, Joris B, Frere J M
机构信息
Université de Liège, Institut de Chimie, Belgium.
出版信息
Biochem J. 1988 Mar 15;250(3):753-60. doi: 10.1042/bj2500753.
Abstract
The sequences of three Enterobacter cloacae ampC beta-lactamase genes have been determined. The deduced amino acid sequences are very similar: out of a total of 361 residues, only eight positions were found to be variable, and several mutations yielded residues with very similar properties. The kinetic properties of two of the enzymes were not significantly different. The three enzymes also exhibited a high degree of homology (greater than 70%) with the ampC beta-lactamases of Escherichia coli K12 and Citrobacter freundii, confirming the homogeneity of class-C beta-lactamases.
摘要
已测定了三种阴沟肠杆菌AmpCβ-内酰胺酶基因的序列。推导的氨基酸序列非常相似：在总共361个残基中，仅发现8个位置可变，并且几个突变产生了具有非常相似性质的残基。其中两种酶的动力学性质没有显著差异。这三种酶还与大肠杆菌K12和弗氏柠檬酸杆菌的AmpCβ-内酰胺酶表现出高度同源性（大于70%），证实了C类β-内酰胺酶的同质性。
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