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2017 ; 6
(ä): ä Nephropedia Template TP
gab.com Text
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English Wikipedia
Substrate specificity of TOR complex 2 is determined by a ubiquitin-fold domain
of the Sin1 subunit
#MMPMID28264193
Tatebe H
; Murayama S
; Yonekura T
; Hatano T
; Richter D
; Furuya T
; Kataoka S
; Furuita K
; Kojima C
; Shiozaki K
Elife
2017[Mar]; 6
(ä): ä PMID28264193
show ga
The target of rapamycin (TOR) protein kinase forms multi-subunit TOR complex 1
(TORC1) and TOR complex 2 (TORC2), which exhibit distinct substrate
specificities. Sin1 is one of the TORC2-specific subunit essential for
phosphorylation and activation of certain AGC-family kinases. Here, we show that
Sin1 is dispensable for the catalytic activity of TORC2, but its conserved region
in the middle (Sin1CRIM) forms a discrete domain that specifically binds the
TORC2 substrate kinases. Sin1CRIM fused to a different TORC2 subunit can recruit
the TORC2 substrate Gad8 for phosphorylation even in the sin1 null mutant of
fission yeast. The solution structure of Sin1CRIM shows a ubiquitin-like fold
with a characteristic acidic loop, which is essential for interaction with the
TORC2 substrates. The specific substrate-recognition function is conserved in
human Sin1CRIM, which may represent a potential target for novel anticancer drugs
that prevent activation of the mTORC2 substrates such as AKT.
|Adaptor Proteins, Signal Transducing/chemistry/genetics/metabolism
[MESH]