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Volume 23, Issue 2, Pages 241-250 (July 2006) The Stress-Activated Hog1 Kinase Is a Selective Transcriptional Elongation Factor for Genes Responding to Osmotic Stress  Markus Proft, Glòria Mas, Eulàlia de Nadal, Alexandre Vendrell, Núria Noriega, Kevin Struhl, Francesc Posas  Molecular Cell  Volume 23, Issue 2, Pages 241-250 (July 2006) DOI: 10.1016/j.molcel.2006.05.031 Copyright © 2006 Elsevier Inc. Terms and Conditions

Figure 1 Hog1 Interacts with the Rpb1 Subunit of Pol II (A) Hog1 photocrosslinks with Rpb1. GST-Hog1 was conjugated with sulfo-SBED (SS), purified (MC), and incubated with purified Rpb9 complex, and the mixture was exposed to UV light. Western blot using anti-GST (α-GST), anti-Rpb1 (8WG16), or streptavidin-HPR (α-biotin) to follow sulfo-SEBD containing proteins. (B) Hog1 coprecipitates in vivo with phosphorylated Rpb1. Yeast cells containing GST or GST-Hog1 were subjected (+) or not (−) to a brief osmostress (0.4 M NaCl, 10 min), and GST proteins were pulled down from yeast extracts treated (+) or not (−) with alkaline phosphatase (AP). Immunoblot using anti-Rpb1 (8WG16), antiphosphorylated Ser5 Rpb1 (H14), or antiphosphorylated Ser2 Rpb1 (H5). Total extract represents <20% of total input protein (middle). The amount of precipitated GST proteins was detected by using anti-GST (bottom). (C) In vitro interaction of Hog1 with Rpb1 decreases after dephosphorylation of Rpb1. TAP-Rpb3 purified from yeast and treated (+) or not (−) with AP was incubated with GST, and GST-Hog1 purified from E. coli, and the samples were analyzed as in (B). Quantification of four independent experiments showed that binding of Hog1 to Rpb1 was reduced to 40% by AP treatment. Molecular Cell 2006 23, 241-250DOI: (10.1016/j.molcel.2006.05.031) Copyright © 2006 Elsevier Inc. Terms and Conditions

Figure 2 Hog1 Associates with Both Promoter and ORF of Osmoresponsive Genes but Is Not Recruited To Constitutively Expressed Genes (A) Hog1 is recruited to the promoter and ORF regions of the osmoresponsive gene STL1 in response to stress. Hog1, Rpb3, TBP, and Sko1 association in vivo with the indicated regions of the STL1 and GRE2 loci in wild-type (W303-1A; no tag), MAP51 (HA-Hog1), MAP37 (HA-Sko1), and W303-1A HA-Rpb3 (HA-Rpb3) that were or were not treated for 5 min with 0.4 M NaCl. Standard deviations are shown. (B) Hog1 associates with the GRE2 promoter and coding region. Hog1 and Rpb3 association in vivo with the indicated regions of GRE2. (C) Hog1 is not recruited to constitutively expressed genes. Hog1 and Rpb3 association in vivo with the indicated regions of ADH1 and ACT1. (D) Kinetics of occupancy of Hog1 and Rpb1 to the STL1 ORF (+402 to +630) in cells that were stressed by 0.4 M NaCl for the indicated times. Data represent the mean and standard deviation of three independent experiments. Molecular Cell 2006 23, 241-250DOI: (10.1016/j.molcel.2006.05.031) Copyright © 2006 Elsevier Inc. Terms and Conditions

Figure 3 Hog1 Associates with the Elongating Polymerase Complex TAP-tagged-Dst1, Spt4, Paf1, or Thp1 strains that express GST or GST-Hog1 were subjected to a brief osmotic shock (10 min, 0.4 M NaCl). GST proteins were pulled down by glutathione Sepharose 4B, and the presence of TAP proteins was probed by immunoblotting using anti-TAP (PAP, Sigma) (top). Total extract represents <20% of total input protein (middle). The amount of precipitated GST proteins was detected using anti-GST (bottom). Molecular Cell 2006 23, 241-250DOI: (10.1016/j.molcel.2006.05.031) Copyright © 2006 Elsevier Inc. Terms and Conditions

Figure 4 Mutations in Specific Elongation Factors Display Impaired Osmostress Gene Expression (A) Wild-type (BY4741) and the indicated mutant strains were spotted on YPD plates with or without 1.2 M NaCl or 2.4 M sorbitol. Growth was scored after 4 days. (B) RNA levels in wild-type and mutant strains were grown to midlog phase in rich medium and then subjected to osmotic shock (0.4 M NaCl) for the indicated time. Molecular Cell 2006 23, 241-250DOI: (10.1016/j.molcel.2006.05.031) Copyright © 2006 Elsevier Inc. Terms and Conditions

Figure 5 Hog1 Is Important for Induction of Osmoresponsive Genes in Response to Stress (A) Hog1 increases STL1 and CTT1 mRNA production when expressed by the LexA-Vp16 activator. RNA levels in wild-type or hog1Δ cells lacking endogenous STL1 or CTT1 were transformed with a vector carrying STL1, CTT1, ADH1, or lacZ genes under the LexA promoter, or an empty vector as control (−) and with a plasmid containing the LexA binding domain fused to the VP16 transcriptional activator. (B) Upon osmotic shock, Hog1 is recruited to the STL1 ORF, but not to the promoter in the LexA-STL1 locus. Strains described in (A) lacking endogenous STL1 and with an integrated tagged Hog1-HA were treated with 0.4 M NaCl for the indicated times and assayed for the presence of Hog1 at the LexA promoter (Prom.) or STL1 ORF. Quantification is depicted as fold binding over TEL1. Molecular Cell 2006 23, 241-250DOI: (10.1016/j.molcel.2006.05.031) Copyright © 2006 Elsevier Inc. Terms and Conditions

Figure 6 Increased Level of the Pol II Elongation Complex in Response to Hog1 Activation (A) Association of Rpb1 in wild-type and or hog1Δ strains (both stl1Δ) containing the LexA-STL1 construct or control cells lacking the LexA-VP16 plasmid. (B) Association of Spt4-HA to the LexA promoter or STL1 coding region of the LexA-STL1 construct in wild-type or hog1 strains (both stl1Δ) that were (+) or were not (−) exposed to hyperosmotic stress. Quantification is depicted as fold binding over TEL1. Data represent the mean and standard deviation of three independent experiments. Molecular Cell 2006 23, 241-250DOI: (10.1016/j.molcel.2006.05.031) Copyright © 2006 Elsevier Inc. Terms and Conditions

Figure 7 The STL1 3′ UTR Is Necessary and Sufficient for Hog1 Association to Stress-Responsive Genes (A) Removal of 3′ UTR in STL1 abolishes binding of Hog1 to STL1 ORF. Strains containing the LexA-STL1 vector or a plasmid containing a deletion of the 3′ UTR (LexA-STL1Δ3′UTR) and the LexA-Vp16 were analyzed for binding of Hog1 to the STL1 ORF. Quantification is depicted as fold binding over TEL1. (B) The presence of STL1 3′ UTR region induces recruitment of Hog1 to the ADH1 ORF. As in (A), Hog1-HA binding was analyzed to the ADH1 ORF in plasmids containing STL1 or ADH1 3′ UTRs. Quantification is depicted as fold binding over TEL1. (C) Schematic diagram depicting the role of Hog1 in the transcription cycle. Upon osmostress, Hog1 is activated and concentrates into the nucleus, where it regulates several aspects of the transcription cycle. There are several mechanisms by which Hog1 modulates transcription initiation: the direct regulation of transcription factor activity, direct stimulation of the recruitment of the Pol II at osmoresponsive promoters, recruitment of the Rpd3 histone deacetylase complex, and modification of chromatin. In addition, Hog1 is also involved in the process of elongation (see Discussion). Molecular Cell 2006 23, 241-250DOI: (10.1016/j.molcel.2006.05.031) Copyright © 2006 Elsevier Inc. Terms and Conditions