Chaperone

n. one who travels with an unmarried woman for reasons of propriety

For the person who accompanies another during social situations, see chaperon. In biology, chaperones are proteins that assist the non-covalent folding/unfolding and the assembly/disassembly of other macromolecular structures, but do not occur in these structures when the latter are performing their normal biological functions. The common perception that chaperones are primarily concerned with protein folding is incorrect. The first protein to be called a chaperone assists the assembly of nucleosomes from folded histones and DNA and such assembly chaperones, especially in the nucleus, are concerned with the assembly of folded subunits into oligomeric structures.
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Chaperone /chap·er·one/ someone or something that accompanies and oversees another. molecular chaperone any of a diverse group of proteins that [more]Chaperone - Community and Resources

Noun
1. one who accompanies and supervises a young woman or gatherings of young people
(synonym) chaperon
(hypernym) defender, guardian, protector, shielder
(hyponym) duenna
(derivation) chaperon
Verb
1. accompany as a chaperone
(synonym) chaperon
(hypernym) escort
(entail) protect
(derivation) chaperon

Any protein that binds to an unfolded or partially folded target protein to prevent misfolding, aggegation, and/or degradation of it. Chaperones also facilitate the target protein's proper folding.