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 SLD structure is highly similar to the middle domain of the histone chaperone FACT. It consists of a twisted ten-stranded beta-sheet flanked by two helices. Since the SLD domain structurally resembles Spt16M, which is known as the well-recognized histone protein H2A-H2B; it is speculated that the SLD may be involved in chromatin binding [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