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2015 ; 25
(9
): 1043-59
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Crystal structure of the Ego1-Ego2-Ego3 complex and its role in promoting Rag
GTPase-dependent TORC1 signaling
#MMPMID26206314
Powis K
; Zhang T
; Panchaud N
; Wang R
; De Virgilio C
; Ding J
Cell Res
2015[Sep]; 25
(9
): 1043-59
PMID26206314
show ga
The target of rapamycin complex 1 (TORC1) integrates various hormonal and
nutrient signals to regulate cell growth, proliferation, and differentiation.
Amino acid-dependent activation of TORC1 is mediated via the yeast EGO complex
(EGOC) consisting of Gtr1, Gtr2, Ego1, and Ego3. Here, we identify the previously
uncharacterized Ycr075w-a/Ego2 protein as an additional EGOC component that is
required for the integrity and localization of the heterodimeric Gtr1-Gtr2
GTPases, equivalent to mammalian Rag GTPases. We also report the crystal
structure of the Ego1-Ego2-Ego3 ternary complex (EGO-TC) at 2.4 Å resolution, in
which Ego2 and Ego3 form a heterodimer flanked along one side by Ego1. Structural
data also reveal the structural conservation of protein components between the
yeast EGO-TC and the human Ragulator, which acts as a GEF for Rag GTPases.
Interestingly, however, artificial tethering of Gtr1-Gtr2 to the vacuolar
membrane is sufficient to activate TORC1 in response to amino acids even in the
absence of the EGO-TC. Our structural and functional data therefore support a
model in which the EGO-TC acts as a scaffold for Rag GTPases in TORC1 signaling.