This family includes outer membrane proteins such as OmpH among others. Skp (OmpH) has been characterised as a molecular chaperone that interacts with unfolded proteins as they emerge in the periplasm from the Sec translocation machinery [2].

1: Bacterial 'histone-like protein I' (HLP-I) is an outer membrane constituent? Hirvas L, Coleman J, Koski P, Vaara M; FEBS Lett 1990;262:123-126. PMID:2318304

2: Crystal structure of Skp, a prefoldin-like chaperone that protects soluble and membrane proteins from aggregation. Walton TA, Sousa MC; Mol Cell 2004;15:367-374. PMID:15304217