an ADP-ribosyl transferase that catalyzes the transfer of ADP ribose moiety (ADPR) from NAD to a guanosine triphosphate (GTP)-binding protein that regulates adenylate cyclase activity
A distinct polypeptide chain within a protein that may be separated from other chains (whether identical or different) without breaking covalent bonds.
A subunit is the implementation of a body stub, referenced by a separate clause, that corresponds to the body of a package, subprogram or generic unit.