This entry represents FCS-type zinc finger, named after the signature FCS residues associated with the third cysteine. It is present in several polycomb group proteins, and adopts a Zn-ribbon like fold [1]. Molecular data suggest that this domain can bind RNA in non-specific manner [2].

1: Solution structure of the FCS zinc finger domain of the human polycomb group protein L(3)mbt-like 2. Lechtenberg BC, Allen MD, Rutherford TJ, Freund SM, Bycroft M; Protein Sci. 2009;18:657-661. PMID:19241375

2: The C. elegans Polycomb gene SOP-2 encodes an RNA binding protein. Zhang H, Christoforou A, Aravind L, Emmons SW, van den Heuvel S, Haber DA; Mol Cell. 2004;14:841-847. PMID:15200961