Figure 2.
RECQL4 has a narrower substrate range than other RecQ helicases. The RECQL4 helicase can unwind forked duplexes (A), D-loops (B), and bubble (C) structures but not duplex DNA (D), Holliday junctions (E), or G-quadruplex structures (F). However, the unwinding activity from the N-terminal domain can utilize duplex DNA substrates.