Volume 120, Issue 5, Pages (March 2005)

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Volume 120, Issue 5, Pages 715-727 (March 2005) Navigating the Chaperone Network: An Integrative Map of Physical and Genetic Interactions Mediated by the Hsp90 Chaperone  Rongmin Zhao, Mike Davey, Ya-Chieh Hsu, Pia Kaplanek, Amy Tong, Ainslie B. Parsons, Nevan Krogan, Gerard Cagney, Duy Mai, Jack Greenblatt, Charles Boone, Andrew Emili, Walid A. Houry  Cell  Volume 120, Issue 5, Pages 715-727 (March 2005) DOI: 10.1016/j.cell.2004.12.024 Copyright © 2005 Elsevier Inc. Terms and Conditions

Figure 1 Overview of the Hsp90 Interaction Data (A) Venn diagram showing the overlap among proteins found to physically or genetically interact with Hsp90 using 2H, TAP, SGA, and GS screens. (B) A network overview using Osprey showing the 22 proteins that physically (2H or TAP) and genetically (SGA or GS) interacted with Hsp90. Arrows connecting the proteins to Hsp90 are color coded according to the screening method(s) used. (C) Functional distribution of Hsp90 interactors using MIPS functional categories compared to that of total yeast proteins. (D) Localization of Hsp90 interactors compared to total yeast proteins using the experimental data of Huh et al. (2003). In (C) and (D), stars refer to statistical enrichment of certain types of proteins in a given screening method as compared to total yeast proteins as assessed by FunSpec (Robinson et al., 2002). Cell 2005 120, 715-727DOI: (10.1016/j.cell.2004.12.024) Copyright © 2005 Elsevier Inc. Terms and Conditions

Figure 2 The Binding of Novel Cofactors to Hsp90 (A) TPR Motifs in Tah1 (YCR060W) are shown as identified by SMART database. (B) Pull-down experiments on Ni-NTA resin using purified recombinant Tah1-H6 with Pih1, or with Pih1 and Hsp82. Alternatively, the pull-downs were carried out using H6-Hsp82 with Pih1 or with Tah1. The gel shown was Coomassie stained. Cell 2005 120, 715-727DOI: (10.1016/j.cell.2004.12.024) Copyright © 2005 Elsevier Inc. Terms and Conditions

Figure 3 Tah1 and Pih1 Affect the in Vivo Function of Hsp90 (A) Wild-type yeast strain, W303, and strains deleted of PIH1, W303 pih1Δ, and TAH1, W303 tah1Δ, were transformed with GR expression plasmid and GR reporter plasmid in which LacZ expression is under the control of a GR response element. The proper maturation of GR upon addition of the hormone DOC was assessed by measuring LacZ activity at 28°C. Inset shows samples immunoblotted with antibodies against GR, Hsp82, and Tah1. Error bars represent standard deviations from the mean of at least six independent experiments. (B) W303, W303 pih1Δ, and W303 tah1Δ were transformed with plasmid expressing LacZ under CYC1 constitutive promoter. LacZ activity was then measured as in (A). (C) The upper panel shows Western blot analysis to measure yeast protein phosphotyrosine levels following induction of vSrc in different yeast cells at 28°C. Also shown are control Western blots of cells expressing GR grown under similar conditions. The levels of vSrc, second panel from top, and of Hsp90, third panel from top, are similar in the different strains. The lowest panel shows the intensity of the phosphotyrosine proteins (top panel) normalized against the amount of vSrc present in the cells (second panel from top). Experiments have been repeated multiple times and similar results have been obtained. Cell 2005 120, 715-727DOI: (10.1016/j.cell.2004.12.024) Copyright © 2005 Elsevier Inc. Terms and Conditions

Figure 4 Tah1 and Pih1 Provide a Link to the Chromatin Remodeling Machinery (A) Tandem affinity purifications of R2TP complex were carried out on strains with either endogenous Tah1 or Pih1 C-terminally TAP-tagged. Proteins were then separated on SDS-PAGE gel, silver stained, and subsequently identified by MALDI-ToF. In the Pih1-TAP pull-down, Tah1 was not observed on the gel and was only detected by LC-MS. (B) The interaction network of Hsp90 with the R2TP, Ino80, and SWR-C complexes is shown using the 2H, TAP, and GS data obtained in our screens and from the ongoing yeast interactome project. The diagram was drawn using Osprey. For clarity, proteins of the Ino80 and SWR-C complexes are shown connected to Rvb1/2 only; TAP-based interactions among proteins in each complex are not shown. (C) Approximately equal number of cells of the indicated genotype in an S288C background were subjected to a 5-fold serial dilution, spotted onto YPD plates (from left to right), and incubated at 30°C for 2 days. (D) Tandem affinity purifications of the Ino80 protein complex using Ies2-TAP were carried out on wild-type strain (WT) or strains deleted of TAH1 or PIH1. A negative control purification was carried on an untagged strain (−). Components of the Ino80 complex were then separated by SDS-PAGE, silver stained, and, subsequently, identified by mass spectrometry. Ies2 was not detected on the gel probably due to poor staining but was detected by LC-MS. Cell 2005 120, 715-727DOI: (10.1016/j.cell.2004.12.024) Copyright © 2005 Elsevier Inc. Terms and Conditions

Figure 5 Integrating the Genetic and Physical Interaction Data Forty-nine ORFs were found to genetically interact with Hsp90 by SGA and GS. Twenty-two of these ORFs were also found to be synthetic lethal, according to the GRID database, with proteins that physically interact with Hsp90 by 2H or TAP. The other 27 ORFs are listed on the left. Cell 2005 120, 715-727DOI: (10.1016/j.cell.2004.12.024) Copyright © 2005 Elsevier Inc. Terms and Conditions

Figure 6 Mapping the Interaction of Hsp90 with Its Putative Substrates/Cofactors through Cochaperones and Cofactors Eighty-four putative Hsp90 substrates/cofactors identified in the 2H or TAP screens were also found to interact with at least one of the 15 Hsp90 cochaperones and cofactors in TAP tag pull-downs. The putative Hsp90 substrates/cofactors are grouped according to GO terms and are placed in the rectangle. Lines refer to TAP-based interactions. The numbers in brackets refer to the number of putative substrates/cofactors in the rectangle that interact with a given cochaperone or cofactor. The interactions are listed in Table S6. Cell 2005 120, 715-727DOI: (10.1016/j.cell.2004.12.024) Copyright © 2005 Elsevier Inc. Terms and Conditions