This domain is found in Primosomal protein N' from Escherichia coli (PriA) and similar proteins predominantly found in Proteobacteria. PriA is a DNA helicase involved in the restart of stalled replication forks, which are lethal in bacteria if left unrepaired. This protein shows a modular arrangement in which its central helicase core is surrounded by several DNA-binding elements, including a circularly permuted winged helix (WH) domain (this entry), which is located towards the N-terminal of the protein and can bind DNA in isolation [1,2].

1: Structural mechanisms of PriA-mediated DNA replication restart. Bhattacharyya B, George NP, Thurmes TM, Zhou R, Jani N, Wessel SR, Sandler SJ, Ha T, Keck JL; Proc Natl Acad Sci U S A. 2014;111:1373-1378. PMID:24379377

2: Structure-specific DNA replication-fork recognition directs helicase and replication restart activities of the PriA helicase. Windgassen TA, Leroux M, Satyshur KA, Sandler SJ, Keck JL; Proc Natl Acad Sci U S A. 2018;115:E9075. PMID:30201718