Nicotinamide-nucleotide adenylyltransferase, archaeal type <p>This family of archaeal proteins exhibits NAD salvage biosynthesis enzyme nicotinamide-nucleotide adenylyltransferase (<db_xref db="EC" dbkey="2.7.7.1"/>) activity. In some cases, the enzyme was tested and found also to have the activity of nicotinate-nucleotide adenylyltransferase (<db_xref db="EC" dbkey="2.7.7.18"/>), an enzyme of NAD de novo biosynthesis, although with a higher Km. In some archaeal species, a number of proteins which are uncharacterised with respect to activity, are also present.</p>