This presumed domain is functionally uncharacterised. This domain family is predominantly found in Bacteroidetes, and is about 100 amino acids in length. This domain contains a highly conserved YDxxGR motif which suggests that it is related the RHS repeats, that appear to be involved in ligand binding. RHS repeats share structural similarity with the eukaryotic tyrosine-aspartate (YD) repeat [1].

1: The BC component of ABC toxins is an RHS-repeat-containing protein encapsulation device. Busby JN, Panjikar S, Landsberg MJ, Hurst MR, Lott JS; Nature. 2013;501:547-550. PMID:23913273