cyclophilin_CeCYP16-like: cyclophilin-type peptidylprolyl cis- trans isomerase) (PPIase) domain similar to Caenorhabditis elegans cyclophilin 16. C. elegans CeCYP-16, compared to the archetypal cyclophilin Human cyclophilin A has, a reduced peptidylprolyl cis- trans isomerase activity, is cyclosporin insensitive and shows an altered substrate preference favoring, hydrophobic, acidic or amide amino acids. Most members of this subfamily have a glutamate residue in the active site at the position equivalent to a tryptophan (W121 in Human cyclophilin A), which has been shown to be important for cyclophilin binding.