RHS proteins contain extended repeat regions. These repeats often appear to be involved in ligand binding (e.g. [1]). Note that this model may not find all the repeats in a protein and that it covers two RHS repeats. The 3D structure of an RHS-repeat-containing protein (the B and C components of an ABC toxin complex) has been determined. The RHS repeats form an extended strip of beta-sheet that spirals around to form a hollow shell, encapsulating the variable C-terminal domain [2].

1: Teneurin-1, a vertebrate homologue of the Drosophila pair-rule gene ten-m, is a neuronal protein with a novel type of heparin-binding domain. Minet AD, Rubin BP, Tucker RP, Baumgartner S, Chiquet-Ehrismann R; J Cell Sci 1999;112:2019-2032. PMID:10341219

2: 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