Absolute quantitation of class IA PI3K subunits and heterodimers in MEFs. (A) Immunoblot of endogenous p85α in lysates of MEFs (clones 1 or 2, genotypes.

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Absolute quantitation of class IA PI3K subunits and heterodimers in MEFs. (A) Immunoblot of endogenous p85α in lysates of MEFs (clones 1 or 2, genotypes indicated) before (pre) or after (post) pull-down with streptavidin beads. βCOP is a loading c... Absolute quantitation of class IA PI3K subunits and heterodimers in MEFs. (A) Immunoblot of endogenous p85α in lysates of MEFs (clones 1 or 2, genotypes indicated) before (pre) or after (post) pull-down with streptavidin beads. βCOP is a loading control. (B) Immunoblots (antibodies noted right) of MEF lysates (genotypes indicated left, all expressing mBirA) before or after pull-down with streptavidin beads compared with aliquots of the bead-wash, the 10 eluate (E1, SDS sample buffer) and 20 eluate (E2). Nonspecific bands are marked *. (C) An anti-avi-immunoblot (fluorescent 20 Ab) of MEF lysates (genotypes indicated). Histogram shows quantification (means ± SD, from two independent MEF clones/genotype) corrected for input protein. (D) Absolute quantitation of avi-tagged-PI3K subunits by streptavidin pull-down and mass spec and corrected for input protein (means, ±SD, from two independent clones/genotype, each clone was measured three times, see SI Appendix, Fig. S11). (E) Absolute levels of the class IA PI3K heterodimers, measured by streptavidin pull-down, from MEF lines expressing avi-tagged p85 (grey bars) or p110 (black) proteins, and mass spec and corrected for input protein (means, ±SD, from two independent MEF clones/genotype, each clone was measured three times). Independent estimates of the amount of each heterodimer are derived from the p85- or p110-directed pull-downs. The underlying data are in SI Appendix, Fig. S11. N. Tsolakos et al. PNAS 2018;115:48:12176-12181 ©2018 by National Academy of Sciences