Adenylylsulfate-ammonia adenylyltransferase () is an enzyme that catalyzes the chemical reaction
The enzyme characterised from Chlorella converts 5'-adenylyl sulfate to adenosine 5'-phosphoramidat by reaction with ammonia. Sulfate is a byproduct. This enzyme activity has been reported to be a general property of fragile histidine triad proteins.
This enzyme is a transferase, specifically one transferring phosphorus-containing nucleotide groups (nucleotidyltransferases). The systematic name of this enzyme class is adenylyl-sulfate:ammonia adenylyltransferase. Other names in common use include APSAT, and adenylylsulfate:ammonia adenylyltransferase.
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