This domain is found in ThermoDBP, a non-canonical single-stranded DNA-binding protein in Thermoproteales. Single-stranded DNA-binding proteins are needed for DNA metabolism, sequestering and protecting transiently formed ssDNA during DNA replication and recombination, detecting DNA damage and recruiting repair proteins. The outer edge of the ssDNA-binding cleft, formed by this domain, has a strongly positive electrostatic surface potential because of the conserved basic residues R49, K54, R65, R80, R86, R90, K97, and R112 [1].

1: Displacement of the canonical single-stranded DNA-binding protein in the Thermoproteales. Paytubi S, McMahon SA, Graham S, Liu H, Botting CH, Makarova KS, Koonin EV, Naismith JH, White MF; Proc Natl Acad Sci U S A. 2012;109:E398-E405. PMID:22106294