S-adenosyl-L-methionine-dependent O-methyltransferase that catalyzes regiospecific methylation at the 7-hydroxy group of 2,7-dihydroxy-5-methyl-1-naphthoate in the biosynthesis of the naphthoate moiety of the neocarzinostatin chromophore. Also recognizes other dihydroxynaphthoate as substrates and catalyzes their regiospecific O-methylation. The carboxylate and its ortho-hydroxy groups of the substrate appear to be crucial for NcsB1 substrate recognition and binding, and O-methylation takes place only at the free hydroxy group of these dihydroxynaphthoic acids.

Belongs to the class I-like SAM-binding methyltransferase superfamily. Cation-independent O-methyltransferase family.

332 amino acids

MGKRAAHIGLRALADLATPMAVRVAATLRVADHIAAGHRTAAEIASAAGAHADSLDRLLRHLVAVGLFTRDGQGVYGLTEFGEQLRDDHAAGKRKWLDMNSAVGRGDLGFVELAHSIRTGQPAYPVRYGTSFWEDLGSDPVLSASFDTLMSHHLELDYTGIAAKYDWAALGHVVDVGGGSGGLLSALLTAHEDLSGTVLDLQGPASAAHRRFLDTGLSGRAQVVVGSFFDPLPAGAGGYVLSAVLHDWDDLSAVAILRRCAEAAGSGGVVLVIEAVAGDEHAGTGMDLRMLTYFGGKERSLAELGELAAQAGLAVRAAHPISYVSIVEMTAL

34.6 kDa

(Note: Representative image - actual molecular weight may vary depending on tag type and expression method)

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