Beta-lactams are the most widely used antibiotics. One of the principle mechanisms for Gram-negative bacteria to resist β-lactams is by producing β-lactamases that degrade β-lactams. This review highlights two regulatory mechanisms for inducing β-lactamase in Gram-negative bacteria. In the ampR-ampC paradigm, the induction of β-lactamase is intimately linked to peptidoglycan recycling. AmpR, a LysR-type transcriptional regulator, plays a central role in regulating expression of β-lactamase. Recent studies found that two-component signal transduction pathway is activated by β-lactams, which in turn induces the expression of β-lactamase. Finally, we discussed the future research directions in β-lactam resistance in Gram-negative bacteria.%β-内酰胺类抗生素是应用最广的一类抗菌药物.β-内酰胺酶能将β-内酰胺类抗生素水解,其诱导表达是革兰氏阴性菌对该类抗生素产生耐药性的最主要原因.文中重点综述了革兰氏阴性菌中β-内酰胺酶诱导表达的两种调控机制.在经典的ampR-ampC调控系统中,β-内酰胺酶的诱导表达与肽聚糖循环密切相关,并且LysR型转录因子AmpR发挥核心的调控作用.近年来发现β-内酰胺类抗生素能激活双组分系统,从而诱导β-内酰胺酶的表达.最后,讨论了革兰氏阴性菌中β-内酰胺类耐药今后的研究方向.
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