This is the C-terminal conserved region of a family of proteins found from fungi to humans. The domain is named WKF after a conserved sequence motif. This domain has been shown to bind RNA [1]. This domain was previously known as DUF2373.

1: The Human RNA-Binding Proteome and Its Dynamics during Translational Arrest. Trendel J, Schwarzl T, Horos R, Prakash A, Bateman A, Hentze MW, Krijgsveld J; Cell. 2018; [Epub ahead of print] PMID:30528433