As inferred from homologs in Saccharomyces cerevisiae, TYW1 in a complex with FMN and an iron-sulfur cluster transfers 2 carbon atoms from pyruvate to 1-methylguanosine-37 of tRNA(Phe), yielding yW-187 (4-demethylwyosine) at nucleotide 37.
lyase activity of TYW1:FMN:4Fe-4S [cytoplasm]
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