Single-stranded DNA-binding protein that participates in viral DNA replication, recombination, and repair (Probable). Coats the lagging-strand ssDNA as the replication fork advances (PubMed:9079662). Stimulates the activities of viral DNA polymerase and DnaB-like SF4 replicative helicase, probably via its interaction with the helicase assembly factor (PubMed:14871889). Together with DnaB-like SF4 replicative helicase and the helicase assembly factor, promotes pairing of two homologous DNA molecules containing complementary single-stranded regions and mediates homologous DNA strand exchange (PubMed:11459967). Promotes also the formation of joint molecules (PubMed:9079662). mRNA specific autogenous translational repressor (PubMed:15507125). Homodimer in the absence of DNA, monomer when binding DNA (PubMed:26275775). Interacts with the DNA helicase assembly protein; a ternary complex between the helicase assembly protein, the single-stranded DNA-binding protein and ssDNA is an obligatory intermediate in the helicase loading mechanism (PubMed:24338568, PubMed:15507125). Part of the replicase complex that includes the DNA polymerase, the polymerase clamp, the clamp loader complex, the single-stranded DNA binding protein, the primase, the DnaB-like SF4 replicative helicase and the helicase assembly factor (PubMed:16800624, PubMed:26102578). Interacts (via C-terminus) with the viral SF1 dDA helicase (PubMed:25481875). Interacts with the viral SF2 UvsW repair helicase (PubMed:23732982). The acidic C-terminus is involved in modulating the ssDNA binding properties (PubMed:29634784). The N-terminus LAST motif is involved in the cooperative binding of the protein to ssDNA (PubMed:1736285). Belongs to the Tequatrovirus single-stranded DNA-binding protein family.