Over 50% of all mammalian proteins are folded bychaperone proteins. In molecular biology, molecular chaperones are proteins that aid in the conformational folding or unfolding of other biological macromolecules, as well as their assembly or disassembly. Chaperones are available when macromolecules fulfill their regular biological roles and have successfully finished the folding and/or assembling procedures. Chaperones are largely associated with protein folding. The first chaperone protein aids in the formation of nucleosomes from folding histones and DNA, and such assembly chaperones, particularly in the nucleus, are involved with the formation of folding subunits into oligomeric structures.

Chaperones play an important role in preventing freshly synthesized polypeptide chains and formed subunits from accumulating into non - functional forms. Because the potential to gather rises when proteins are denatured by stress, many chaperones, although by no way all, are heat shock proteins.