Abstract:
:The chaperonin GroEL binds nonnative proteins too large to fit inside the productive GroEL-GroES cis cavity, but whether and how it assists their folding has remained unanswered. We have examined yeast mitochondrial aconitase, an 82 kDa monomeric Fe(4)S(4) cluster-containing enzyme, observed to aggregate in chaperonin-deficient mitochondria. We observed that aconitase folding both in vivo and in vitro requires both GroEL and GroES, and proceeds via multiple rounds of binding and release. Unlike the folding of smaller substrates, however, this mechanism does not involve cis encapsulation but, rather, requires GroES binding to the trans ring to release nonnative substrate, which likely folds in solution. Following the phase of ATP/GroES-dependent refolding, GroEL stably bound apoaconitase, releasing active holoenzyme upon Fe(4)S(4) cofactor formation, independent of ATP and GroES.
journal_name
Celljournal_title
Cellauthors
Chaudhuri TK,Farr GW,Fenton WA,Rospert S,Horwich ALdoi
10.1016/s0092-8674(01)00523-2subject
Has Abstractpub_date
2001-10-19 00:00:00pages
235-46issue
2eissn
0092-8674issn
1097-4172pii
S0092-8674(01)00523-2journal_volume
107pub_type
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