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2016 ; 16
(11
): 3062-3074
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An Integrative Analysis of the InR/PI3K/Akt Network Identifies the Dynamic
Response to Insulin Signaling
#MMPMID27626673
Vinayagam A
; Kulkarni MM
; Sopko R
; Sun X
; Hu Y
; Nand A
; Villalta C
; Moghimi A
; Yang X
; Mohr SE
; Hong P
; Asara JM
; Perrimon N
Cell Rep
2016[Sep]; 16
(11
): 3062-3074
PMID27626673
show ga
Insulin regulates an essential conserved signaling pathway affecting growth,
proliferation, and metabolism. To expand our understanding of the insulin
pathway, we combine biochemical, genetic, and computational approaches to build a
comprehensive Drosophila InR/PI3K/Akt network. First, we map the dynamic
protein-protein interaction network surrounding the insulin core pathway using
bait-prey interactions connecting 566 proteins. Combining RNAi screening and
phospho-specific antibodies, we find that 47% of interacting proteins affect
pathway activity, and, using quantitative phosphoproteomics, we demonstrate that
?10% of interacting proteins are regulated by insulin stimulation at the level of
phosphorylation. Next, we integrate these orthogonal datasets to characterize the
structure and dynamics of the insulin network at the level of protein complexes
and validate our method by identifying regulatory roles for the Protein
Phosphatase 2A (PP2A) and Reptin-Pontin chromatin-remodeling complexes as
negative and positive regulators of ribosome biogenesis, respectively.
Altogether, our study represents a comprehensive resource for the study of the
evolutionary conserved insulin network.