name: wybutosine biosynthetic process
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def: "The chemical reactions and pathways resulting in the formation of wybutosine, 3H-imidazo[1,2-alpha]purine-7-butanoic acid, 4,9-dihydro- alpha-[(methoxycarbonyl)amino]- 4,6-dimethyl-9-oxo- 3-beta-D-ribofuranosyl methyl ester, a modified nucleoside found in some tRNA molecules." [GOC:hjd, GOC:mah, RNAmods:037]
comment: Note that wybutosine is a hypermodified G-residue, formerly called the Y-base, and its derivatives are exclusively found at position 37 (anticodon loop) of tRNAPhe.
synonym: "yW biosynthesis" EXACT 
synonym: "yW biosynthetic process" EXACT 
is_a: GO:0006400 ! tRNA modification
is_a: GO:0031590 ! wybutosine metabolic process
is_a: GO:1901566 ! organonitrogen compound biosynthetic process
is_a: GO:1901659 ! glycosyl compound biosynthetic process
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