This domain is found in D5 proteins of DNA viruses and bacteriophage P4 DNA primases phages.

1: Phage P4 origin-binding domain structure reveals a mechanism for regulation of DNA-binding activity by homo- and heterodimerization of winged helix proteins. Yeo HJ, Ziegelin G, Korolev S, Calendar R, Lanka E, Waksman G; Mol Microbiol. 2002;43:855-867. PMID:11929537

2: The vaccinia virus D5 protein, which is required for DNA replication, is a nucleic acid-independent nucleoside triphosphatase. Evans E, Klemperer N, Ghosh R, Traktman P; J Virol 1995;69:5353-5361. PMID:7636979