A subcategory of chaperonins found in ARCHAEA and the CYTOSOL of eukaryotic cells. Group II chaperonins form a barrel-shaped macromolecular structure that is distinct from GROUP I CHAPERONINS in that it does not utilize a separate lid like structure to enclose proteins.

Synonyms: Chaparonins, Group II, Group II Chaparonins, Type II Chaperonins, Chaperonins, Group II, Group II Chaperonins, Chaperonins, Type II, EC 3.6.1.-