Chaperonin

Chaperonin refers to a subclass of molecular chaperones—large, double-ring oligomeric protein complexes that facilitate the proper folding of unfolded or misfolded proteins in an ATP-dependent manner[1][6]. Prominent examples include GroEL (E. coli), Hsp60 (mitochondria), and CCT (eukaryotic cytosol)[1][3]. Chaperonins use energy from ATP hydrolysis to undergo conformational changes that encapsulate substrate proteins in a hydrophilic cavity, providing an isolated environment for correct folding[4][6]. This process is crucial under cellular stress when misfolded proteins are common. Chaperonins also play roles in immune responses and protection against protein aggregation[1][3]. Although abnormal chaperonin function can contribute to some disease states—including neurodegeneration and infection—there are currently no approved drugs that target chaperonins therapeutically, and direct targeting may present substantial risks because of their essential cellular role[1][6]. The term "chaperonin" denotes a protein complex family rather than a single molecular target, so it does not match the standard definition of a druggable therapeutic target such as a receptor, enzyme, or transporter.

Other names

Chaperone protein (general class)Hsp60 (for specific members, such as the mitochondrial chaperonin in humans)GroEL (for E. coli)Cpn60 (alternative for some bacterial chaperonins)HSPD1 (for human gene encoding mitochondrial Hsp60)CCT (for eukaryotic cytosolic chaperonin known as "chaperonin-containing TCP-1")