Nucleotidyltransferases (EC 2.7.7) comprise a large enzyme family with diverse roles in polynucleotide synthesis and modification. This domain is structurally related to kanamycin nucleotidyltransferase (KNTase) and forms a complex with HI0073, a sequence homolog of the nucleotide-binding domain of this nucleotidyltransferase superfamily [1].

1: The HI0073/HI0074 protein pair from Haemophilus influenzae is a member of a new nucleotidyltransferase family: structure, sequence analyses, and solution studies. Lehmann C, Lim K, Chalamasetty VR, Krajewski W, Melamud E, Galkin A, Howard A, Kelman Z, Reddy PT, Murzin AG, Herzberg O; Proteins. 2003;50:249-260. PMID:12486719