Discovery of Two Novel Oxidases Using a High-Throughput Activity Screen

Area of Science:

• Biochemistry and enzymology
• Biotechnology
• Enzyme discovery

Background:

• Novel enzymes are crucial as catalysts in biotechnology.
• Discovering enzymes with specific activities is challenging.
• Existing enzyme databases lack sequence information for some characterized activities.

Purpose of the Study:

• To develop and apply a high-throughput screening approach for novel enzyme discovery.
• To identify new oxidases with unique catalytic functions.
• To characterize newly discovered enzymes and their substrates.

Main Methods:

• High-throughput screening of 96 putative oxidases against 23 diverse substrates.
• Biochemical characterization of identified enzymes.
• Sequence analysis and comparison with known proteins.

Main Results:

• Discovery of N-acetyl-D-hexosamine oxidase (EC 1.1.3.29) from Ralstonia solanacearum, active on N-acetylglucosamine and N-acetylgalactosamine.
• Identification of a novel long-chain alcohol oxidase (LCAO, EC 1.1.3.20) from marine euryarchaeota, with 1-dodecanol as a preferred substrate.
• The novel LCAO shows no sequence similarity to previously characterized enzymes of this class.

Conclusions:

• The high-throughput screening approach is effective for discovering novel enzyme activities.
• Two new enzymes, N-acetyl-D-hexosamine oxidase and a novel LCAO, expand the repertoire of known biocatalysts.
• These discoveries provide new tools for biotechnological applications and advance our understanding of enzyme diversity.