Archaeosine synthase (, ArcS, TgtA2, MJ1022 (gene), glutamine:preQ0-tRNA amidinotransferase) is an enzyme with systematic name L-glutamine:7-cyano-7-carbaguanine aminotransferase. This enzyme catalyses the following chemical reaction
L-glutamine + 7-cyano-7-carbaguanine15 in tRNA + H2O L-glutamate + archaeine15 in tRNA
In Euryarchaeota the reaction is catalysed by ArcS.
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