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Prim_Pol: Primase-polymerase (primpol) domain of the type found in bifunctional replicases from archaeal plasmids, including ORF904 protein of the crenarchaeal plasmid pRN1 from Sulfolobus islandicus (pRN1 primpol). These primpol domains belong to the archaeal/eukaryal primase (AEP) superfamily. This group includes archaeal plasmids and bacteriophage AEPs. The ORF904 protein is a multifunctional protein having ATPase, primase and DNA polymerase activity, and may play a role in the replication of the archaeal plasmid. The pRN1 primpol domain exhibits DNA polymerase and primase activities; a cluster of active site residues (three acidic residues, and a histidine) is required for both these activities. For pRN1 primpol, the primase activity prefers dNTPs to rNTPs; incorporation of dNTPs requires rNTP as cofactor. The pRN1 primpol contains an unusual zinc-binding stem, which is not conserved in other members of this group.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",