Discovery and Characterization of a Single-Component Halogenase for Phenazine Halogenation

Area of Science:

• Biocatalysis
• Enzymology
• Medicinal Chemistry

Background:

• Halogenated phenazines show potential as antimicrobial and antibiofilm agents.
• Current methods for producing these compounds rely on chemical synthesis.

Purpose of the Study:

• To identify and characterize a novel enzyme capable of halogenating phenazine scaffolds.
• To explore the potential of enzymatic synthesis for producing pharmaceutically relevant halogenated phenazines.

Main Methods:

• Enzyme discovery and characterization of PezW, a flavin-dependent halogenase.
• Enzymatic synthesis of halogenated phenazine derivatives.
• Structural modeling and site-directed mutagenesis to understand enzyme-substrate interactions.

Main Results:

• Identification of PezW, a single-component flavin-dependent halogenase.
• Demonstration of PezW's ability to enzymatically synthesize bioactive 2-bromo-1-hydroxyphenazine and 2,4-bromo-1-hydroxyphenazine.
• Key residues involved in substrate binding and catalysis were identified through structural analysis and mutagenesis.

Conclusions:

• PezW is a novel biocatalyst for the synthesis of halogenated phenazines.
• Enzymatic production offers a promising alternative for generating pharmaceutical compounds.
• Further research into PezW can advance the development of new antimicrobial and antibiofilm agents.