My Dictionary #2

Chaperone - A protein required for the proper folding and/or assembly of another protein or protein complex.

(1) 

Chaperonins - A complex composed of multiple heat shock protein shunts that make double ring structures.

(2)

PDI - Enzyme in the ER in eukaryotes that breaks and forms disulfide bonds between the cysteine residues within proteins as they fold.

Picture references:

(1) http://study.com/cimages/multimages/16/chaperonin1.png

(2) https://www3.nd.edu/~aseriann/CHAP9B.html/img024.gif