a,Schematic depiction of the detailed interactions between MapSPARTA and RNA/DNA duplex. Residues from PIWI domain, MID domain and APAZ domain are colored in yellow, pink, and blue, respectively.
b,Detailed interactions between PIWI domain and RNA-DNA duplex. Residues involved in coordinating RNA-DNA duplex are highlighted in sticks. DNA and RNA bases are labelled in green and red, respectively.
c, An enlarged view of the interface between APAZ and RNA-DNA duplex. Residues involved in interacting with RNA-DNA duplex are highlighted in sticks. DNA and RNA bases are labelled in green and red, respectively.
d, Overlaid structures of apo MapSPARTA and MapSPARTA with RNA/DNA, revealing the tilting of negative-charged motif and positive-charged pocket critical for MID-MID interactions mediated dimerization.