Members of this family are involved in the folding pathway of tubulins and form a beta helix structure [2].

1: Functional analysis of the tubulin-folding cofactor C in Arabidopsis thaliana. Kirik V, Mathur J, Grini PE, Klinkhammer I, Adler K, Bechtold N, Herzog M, Bonneville JM, Hulskamp M; Curr Biol 2002;12:1519-1523. PMID:12225668

2: Crystal structure of the human retinitis pigmentosa 2 protein and its interaction with Arl3. Kuhnel K, Veltel S, Schlichting I, Wittinghofer A; Structure. 2006;14:367-378. PMID:16472755