This family consists of a group of bacteriophage replication gene A protein (GPA) like sequences from both viruses and bacteria. The members of this family are likely to be endonucleases [1,2,3].

1: Studies of bacteriophage P2 DNA replication. The DNA sequence of the cis-acting gene A and ori region and construction of a P2 mini-chromosome. Liu Y, Saha S, Haggard-Ljungquist E; J Mol Biol 1993;231:361-374. PMID:8510152

2: Identification of an HP1 phage protein required for site-specific excision. Esposito D, Scocca JJ; Mol Microbiol 1994;13:685-695. PMID:7997180

3: Retron for the 67-base multicopy single-stranded DNA from Escherichia coli: a potential transposable element encoding both reverse transcriptase and Dam methylase functions. Hsu MY, Inouye M, Inouye S; Proc Natl Acad Sci U S A 1990;87:9454-9458. PMID:1701261

4: Role of polymeric forms of the bacteriophage phi X174 coded gene A protein in phi XRFI DNA cleavage. Ikeda JE, Yudelevich A, Shimamoto N, Hurwitz J; J Biol Chem 1979;254:9416-9428. PMID:158588

5: Two juxtaposed tyrosyl-OH groups participate in phi X174 gene A protein catalysed cleavage and ligation of DNA. van Mansfeld AD, van Teeffelen HA, Baas PD, Jansz HS; Nucleic Acids Res 1986;14:4229-4238. PMID:2940511