Aryl-alcohol oxidases: catalysis, diversity, structure-function and emerging biotechnological applications

Area of Science:

• Biochemistry and enzymology
• Molecular biology
• Biotechnology

Background:

• Aryl-alcohol oxidases (AAOs) are flavin-dependent enzymes from the GMC oxidoreductase superfamily.
• They catalyze the oxidation of alcohols to aldehydes, producing hydrogen peroxide.
• AAOs are found in fungi, bacteria, and arthropods, showing significant diversity.

Purpose of the Study:

• To explore the structural and functional diversity of Aryl-alcohol oxidases across different kingdoms.
• To identify and classify novel AAO sequences through genomic mining.
• To understand the evolutionary relationships and potential functional specializations of AAOs.

Main Methods:

• BLAST-based sequence similarity searches across fungal, bacterial, and arthropod genomes.
• Classification of identified AAO sequences based on conserved motifs and active-site architecture.
• Analysis of structural and mechanistic insights, including conserved histidine residues in catalysis.

Main Results:

• Hundreds of putative AAO sequences were identified and classified into distinct structural and evolutionary types.
• Convergent evolutionary strategies and potential functional specializations were revealed across kingdoms.
• AAOs exhibit broad substrate promiscuity influenced by active-site architecture.

Conclusions:

• AAOs possess significant structural and functional diversity across fungi, bacteria, and arthropods.
• Genomic mining and sequence analysis are effective for discovering and classifying AAO diversity.
• AAOs hold substantial potential for green chemistry and sustainable biocatalysis in various industries.