This short domain is found in multiple copies in bacterial helicase proteins. The domain is predicted to contain 3 alpha helices. The function of this domain may be to bind nucleic acid.

1: New Knowledge from Old: In silico discovery of novel protein domains in Streptomyces coelicolor. Yeats C, Bentley S, Bateman A; BMC Microbiol 2003;3:3-3. PMID:12625841