Is predicted to encode a protein with the following domains: Helicase, C-terminal; P-loop containing nucleoside triphosphate hydrolase; and Helicase conserved C-terminal domain. Is an ortholog of C. elegans F53H4.6; csb-1; and pqn-15. In C. elegans, csb-1 is involved in UV protection and transcription-coupled nucleotide-excision repair.