CODMA-A3: A Competitive Oligo-based DNA Modification Assay Applied to APOBEC Enzymes

CODMA-A3 is a microtiter-plate CODMA method that rapidly screens 20–40 APOBEC3 (A3) enzyme variants by detecting substrate competition and utilization fingerprint shifts.

• Why it matters: Variant discovery can outpace experimental characterization, creating a resource-allocation gap for prioritizing which APOBEC3 variants merit mechanistic study.
• What they did: The assay avoids protein purification, supports multiple-substrate competition, and estimates normalized substrate turnover without classic Michaelis–Menten analysis.
• The result: CODMA-A3 distinguishes fluorophore identity from substrate sequence effects, resolves single-nucleotide substitution effects in competing substrates, and enables comparative characterization before detailed mechanistic investigation.