GroELs from several pathogenic bacteria have been shown to display substrate promioscuity, wherein the substrate spectrum expands to non-proteins as well. We have argued in our article

that different chaperonins in an organism might be involved in distinct biochemical functions that remain to be discovered, some of which might be modulated by different oligomeric states of the chaperonins.

However, I wish to know if there are examples for chaperonins from free living bacteria, exhibiting such substrate promiscuity.

Article Protein chaperones and non-protein substrates: On substrate ...