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2015 ; 12
(10
): 1533-40
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Cotranslational Protein Folding inside the Ribosome Exit Tunnel
#MMPMID26321634
Nilsson OB
; Hedman R
; Marino J
; Wickles S
; Bischoff L
; Johansson M
; Müller-Lucks A
; Trovato F
; Puglisi JD
; O'Brien EP
; Beckmann R
; von Heijne G
Cell Rep
2015[Sep]; 12
(10
): 1533-40
PMID26321634
show ga
At what point during translation do proteins fold? It is well established that
proteins can fold cotranslationally outside the ribosome exit tunnel, whereas
studies of folding inside the exit tunnel have so far detected only the formation
of helical secondary structure and collapsed or partially structured folding
intermediates. Here, using a combination of cotranslational nascent chain force
measurements, inter-subunit fluorescence resonance energy transfer studies on
single translating ribosomes, molecular dynamics simulations, and cryoelectron
microscopy, we show that a small zinc-finger domain protein can fold deep inside
the vestibule of the ribosome exit tunnel. Thus, for small protein domains, the
ribosome itself can provide the kind of sheltered folding environment that
chaperones provide for larger proteins.