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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Mol+Biol
2015 ; 427
(18
): 2919-30
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The Mechanism and Function of Group II Chaperonins
#MMPMID25936650
Lopez T
; Dalton K
; Frydman J
J Mol Biol
2015[Sep]; 427
(18
): 2919-30
PMID25936650
show ga
Protein folding in the cell requires the assistance of enzymes collectively
called chaperones. Among these, the chaperonins are 1-MDa ring-shaped oligomeric
complexes that bind unfolded polypeptides and promote their folding within an
isolated chamber in an ATP-dependent manner. Group II chaperonins, found in
archaea and eukaryotes, contain a built-in lid that opens and closes over the
central chamber. In eukaryotes, the chaperonin TRiC/CCT is hetero-oligomeric,
consisting of two stacked rings of eight paralogous subunits each. TRiC
facilitates folding of approximately 10% of the eukaryotic proteome, including
many cytoskeletal components and cell cycle regulators. Folding of many cellular
substrates of TRiC cannot be assisted by any other chaperone. A complete
structural and mechanistic understanding of this highly conserved and essential
chaperonin remains elusive. However, recent work is beginning to shed light on
key aspects of chaperonin function and how their unique properties underlie their
contribution to maintaining cellular proteostasis.