GO:0102521:   tRNA-4-demethylwyosine synthase activity
Catalysis of the reaction: pyruvate + S-adenosyl-L-methionine + N1-methylguanine37 in tRNAPhe = L-methionine + 5"-deoxyadenosine + carbon dioxide + H2O + 4-demethylwyosine37 in tRNAPhe