Class D β-lactamases: a reappraisal after five decades.

Area of Science:

• Microbiology
• Biochemistry
• Drug Discovery

Background:

• Beta-lactam antibiotics are vital for treating bacterial infections.
• Beta-lactamases, particularly class D variants, pose a significant challenge by inactivating these antibiotics.
• Class D beta-lactamases exhibit remarkable diversity and can hydrolyze a broad spectrum of drugs, including carbapenems.

Purpose of the Study:

• To review the characteristics and mechanisms of class D beta-lactamases.
• To highlight the challenges in inhibiting these enzymes.
• To discuss emerging strategies for developing novel class D beta-lactamase inhibitors.

Main Methods:

• Review of existing literature on class D beta-lactamases.
• Analysis of enzyme structure-function relationships.
• Discussion of current and future inhibitor development approaches.

Main Results:

• Class D beta-lactamases possess a unique active-site lysine modification enabling diverse hydrolytic capabilities.
• Existing inhibitors are ineffective against class D enzymes, especially carbapenemases.
• Novel inhibitor compounds, including beta-lactam and non-beta-lactam derivatives, show promise.

Conclusions:

• Class D beta-lactamases represent a critical threat in antimicrobial resistance.
• Targeting class D beta-lactamases requires innovative inhibitor design strategies.
• Further research into mechanism-based inhibitors is essential for developing effective treatments.