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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+Cell+Biol
2015 ; 211
(1
): 91-104
Nephropedia Template TP
gab.com Text
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English Wikipedia
Ribosome binding induces repositioning of the signal recognition particle
receptor on the translocon
#MMPMID26459600
Kuhn P
; Draycheva A
; Vogt A
; Petriman NA
; Sturm L
; Drepper F
; Warscheid B
; Wintermeyer W
; Koch HG
J Cell Biol
2015[Oct]; 211
(1
): 91-104
PMID26459600
show ga
Cotranslational protein targeting delivers proteins to the bacterial cytoplasmic
membrane or to the eukaryotic endoplasmic reticulum membrane. The signal
recognition particle (SRP) binds to signal sequences emerging from the ribosomal
tunnel and targets the ribosome-nascent-chain complex (RNC) to the SRP receptor,
termed FtsY in bacteria. FtsY interacts with the fifth cytosolic loop of SecY in
the SecYEG translocon, but the functional role of the interaction is unclear. By
using photo-cross-linking and fluorescence resonance energy transfer
measurements, we show that FtsY-SecY complex formation is guanosine triphosphate
independent but requires a phospholipid environment. Binding of an SRP-RNC
complex exposing a hydrophobic transmembrane segment induces a rearrangement of
the SecY-FtsY complex, which allows the subsequent contact between SecY and
ribosomal protein uL23. These results suggest that direct RNC transfer to the
translocon is guided by the interaction between SRP and translocon-bound FtsY in
a quaternary targeting complex.
|*Protein Biosynthesis
[MESH]
|Adenosine Triphosphatases/chemistry
[MESH]
|Bacterial Proteins/chemistry
[MESH]
|Binding, Competitive
[MESH]
|Escherichia coli
[MESH]
|Escherichia coli Proteins/*chemistry
[MESH]
|Lipids/chemistry
[MESH]
|Membrane Transport Proteins/chemistry
[MESH]
|Protein Binding
[MESH]
|Receptors, Cytoplasmic and Nuclear/chemistry
[MESH]