Synaptonemal complex protein 2 (SYCP2) N-terminal region contains two separate subdomains an ARLD (armadillo-repeat-like domain) and an SLD (Spt16M-like domain). The ARLD domain belongs to the armadillo-repeat protein family. Armadillo-repeat units often form a superhelix, which typically provides a platform for many protein partners that transduce Wnt signaling, such as beta-catenin. The ARLD of mouse SYCP2 was found to associate with different protein partners, including CENP J and CENP F. ARLD structure is highly similar to that of the 'required for cell differentiation (RCD-1)' protein [1].

1: Synaptonemal complex protein 2 (SYCP2) mediates the association of the centromere with the synaptonemal complex. Feng J, Fu S, Cao X, Wu H, Lu J, Zeng M, Liu L, Yang X, Shen Y; Protein Cell. 2017;8:538-543. PMID:28150150