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2017 ; 8
(1
): 1394
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Structural basis for Ragulator functioning as a scaffold in membrane-anchoring of
Rag GTPases and mTORC1
#MMPMID29123114
Zhang T
; Wang R
; Wang Z
; Wang X
; Wang F
; Ding J
Nat Commun
2017[Nov]; 8
(1
): 1394
PMID29123114
show ga
Amino acid-dependent activation of the mechanistic target of rapamycin complex 1
(mTORC1) is mediated by Rag GTPases, which are recruited to the lysosome by the
Ragulator complex consisting of p18, MP1, p14, HBXIP and C7orf59; however, the
molecular mechanism is elusive. Here, we report the crystal structure of
Ragulator, in which p18 wraps around the MP1-p14 and C7orf59-HBXIP heterodimers
and the interactions of p18 with MP1, C7orf59, and HBXIP are essential for the
assembly of Ragulator. There are two binding sites for the Roadblock domains of
Rag GTPases: helix ?1 of p18 and the two helices side of MP1-p14. The interaction
of Ragulator with Rag GTPases is required for their cellular co-localization and
can be competitively inhibited by C17orf59. Collectively, our data indicate that
Ragulator functions as a scaffold to recruit Rag GTPases to lysosomal membrane in
mTORC1 signaling.
|Adaptor Proteins, Signal Transducing/metabolism
[MESH]