Primosome PriB/single-strand DNA-binding (IPR000424)

Short name: Primosome_PriB/ssb

Overlapping homologous superfamilies

Family relationships


The Escherichia coli single-strand binding protein [PMID: 2087220] (gene ssb), also known as the helix-destabilising protein, is a protein of 177 amino acids. It binds tightly, as a homotetramer, to single-stranded DNA (ss-DNA) and plays an important role in DNA replication, recombination and repair. Closely related variants of SSB are encoded in the genome of a variety of large self-transmissible plasmids. SSB has also been characterized in bacteria such as Proteus mirabilis or Serratia marcescens. Eukaryotic mitochondrial proteins that bind ss-DNA and are probably involved in mitochondrial DNA replication are structurally and evolutionary related to prokaryotic SSB.

Primosomal replication protein N (PriB) is a specialist protein from bacteria that binds single-stranded DNA at the primosome assembly site (PAS). The primosome is a mobile multiprotein replication priming complex which is believe to operate on the lagging-strand template at the E. coli DNA replication fork [PMID: 1856227]. The primosome consists of one monomer of PriC and DnaT, two monomers of PriA, two dimers of PriB and one hexamer of DnaB [PMID: 8663106].

GO terms

Biological Process

No terms assigned in this category.

Molecular Function

GO:0003697 single-stranded DNA binding

Cellular Component

No terms assigned in this category.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.
PROSITE profiles