This is KH3 domain of Defective in germ line development protein 3 (GLD-3) from C. elegans, a protein required maternally for germline survival and embryogenesis [1]. This domain together with KH2, KH4 and KH5 are organized into a globular structural unit.

1: Four KH domains of the C. elegans Bicaudal-C ortholog GLD-3 form a globular structural platform. Nakel K, Hartung SA, Bonneau F, Eckmann CR, Conti E; RNA. 2010;16:2058-2067. PMID:20823118