ArgoL2 is the second linker domain in eukaryotic argonaute proteins. It starts with two alpha-helices aligned orthogonally to each other followed by a beta-strand involved in linking the two lobes, the PAZ lobe and the Piwi lobe of argonaute to each other. Linker 2 together with the N, PAZ and L1 domains form a compact global fold [1]. Numerous residues from Piwi, L1 and L2 linkers direct the path of the phosphate backbone of nucleotides 7-9, thus allowing DNA-slicing [2].

1: Crystal structure of A. aeolicus argonaute, a site-specific DNA-guided endoribonuclease, provides insights into RISC-mediated mRNA cleavage. Yuan YR, Pei Y, Ma JB, Kuryavyi V, Zhadina M, Meister G, Chen HY, Dauter Z, Tuschl T, Patel DJ; Mol Cell. 2005;19:405-419. PMID:16061186

2: The making of a slicer: activation of human Argonaute-1. Faehnle CR, Elkayam E, Haase AD, Hannon GJ, Joshua-Tor L; Cell Rep. 2013;3:1901-1909. PMID:23746446