Aspartyltransferase () is an enzyme that catalyzes the chemical reaction

The two substrates of this enzyme characterised from Mycobacterium tuberculosis are L-asparagine and hydroxylamine, which are converted to the hydroxamate, β-L-aspartylhydroxamic acid and ammonia.

This enzyme belongs to the family of transferases, specifically the aminoacyltransferases. The systematic name of this enzyme class is L-asparagine:hydroxylamine gamma-aspartyltransferase. Other names in common use include beta-aspartyl transferase, and aspartotransferase.

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