ArticleApplied biochemistry and biotechnology2026
Functional Characterization of a Novel Flavonoid O-methyltransferase From Polar Pedobacter sp. PAMC26386 and Bioactivity Assessment of Flavonoids.
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Abstract
Flavonoid O-methyltransferases (OMTs) catalyze the methylation of flavonoid hydroxyl groups, enhancing structural diversity and biological activity. In this study, we identified and characterized a novel Class I flavonoid OMT from the Antarctic bacterium Pedobacter sp. PAMC26386. Despite originating from a cold-adapted organism, the enzyme exhibited high catalytic activity at 55 °C and a strong preference for Co²⁺ as a cofactor. Sequence and phylogenetic analyses confirmed its classification as a flavonoid-specific OMT and revealed conserved motifs for S-adenosyl-L-methionine (SAM) binding and metal coordination. The enzyme accepted a wide range of flavonoid substrates, with quercetin and fisetin showing the highest activities. Kinetic analysis indicated greater substrate affinity for quercetin (K
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