TY - JOUR
T1 - Specificity and commonality of the phosphoinositide-binding proteome analyzed by quantitative mass spectrometry
AU - Jungmichel, Stephanie
AU - Sylvestersen, Kathrine B
AU - Choudhary, Chuna Ram
AU - Nguyen, Steve
AU - Mann, Matthias
AU - Nielsen, Michael L
N1 - Copyright © 2014 The Authors. Published by Elsevier Inc. All rights reserved.
PY - 2014/2/13
Y1 - 2014/2/13
N2 - Phosphoinositides (PIPs) play key roles in signaling and disease. Using high-resolution quantitative mass spectrometry, we identified PIP-interacting proteins and profiled their binding specificities toward all seven PIP variants. This analysis revealed 405 PIP-binding proteins, which is greater than the total number of phospho- or ubiquitin-binding domains. Translocation and inhibitor assays of identified PIP-binding proteins confirmed that our methodology targets direct interactors. The PIP interactome encompasses proteins from diverse cellular compartments, prominently including the nucleus. Our data set revealed a consensus motif for PI(3,4,5)P3-interacting pleckstrin homology (PH) domains, which enabled in silico identification of phosphoinositide interactors. Members of the dedicator of cytokinesis family C exhibited specificity toward both PI(3,4,5)P3 and PI(4,5)P2. Structurally, this dual specificity is explained by a decreased number of positively charged residues in the L1 subdomain compared with DOCK1. The presented PIP-binding proteome and its specificity toward individual PIPs should be a valuable resource for the community.
AB - Phosphoinositides (PIPs) play key roles in signaling and disease. Using high-resolution quantitative mass spectrometry, we identified PIP-interacting proteins and profiled their binding specificities toward all seven PIP variants. This analysis revealed 405 PIP-binding proteins, which is greater than the total number of phospho- or ubiquitin-binding domains. Translocation and inhibitor assays of identified PIP-binding proteins confirmed that our methodology targets direct interactors. The PIP interactome encompasses proteins from diverse cellular compartments, prominently including the nucleus. Our data set revealed a consensus motif for PI(3,4,5)P3-interacting pleckstrin homology (PH) domains, which enabled in silico identification of phosphoinositide interactors. Members of the dedicator of cytokinesis family C exhibited specificity toward both PI(3,4,5)P3 and PI(4,5)P2. Structurally, this dual specificity is explained by a decreased number of positively charged residues in the L1 subdomain compared with DOCK1. The presented PIP-binding proteome and its specificity toward individual PIPs should be a valuable resource for the community.
U2 - 10.1016/j.celrep.2013.12.038
DO - 10.1016/j.celrep.2013.12.038
M3 - Journal article
C2 - 24462288
VL - 6
SP - 578
EP - 591
JO - Cell Reports
JF - Cell Reports
SN - 2211-1247
IS - 3
ER -