title: Conditional regulation of Puf1p, Puf4p, and Puf5p activity alters YHB1 mRNA stability for a rapid response to toxic nitric oxide stress in yeast.
abstract: Puf proteins regulate mRNA degradation and translation through interactions with 3' untranslated regions (UTRs). Such regulation provides an efficient method to rapidly alter protein production during cellular stress. YHB1 encodes the only protein to detoxify nitric oxide in yeast. Here we show that YHB1 mRNA is destabilized by Puf1p, Puf4p, and Puf5p through two overlapping Puf recognition elements (PREs) in the YHB1 3' UTR. Overexpression of any of the three Pufs is sufficient to fully rescue wild-type decay in the absence of other Pufs, and overexpression of Puf4p or Puf5p can enhance the rate of wild-type decay. YHB1 mRNA decay stimulation by Puf proteins is also responsive to cellular stress. YHB1 mRNA is stabilized in galactose and high culture density, indicating inactivation of the Puf proteins. This condition-specific inactivation of Pufs is overcome by Puf overexpression, and Puf4p/Puf5p overexpression during nitric oxide exposure reduces the steady-state level of endogenous YHB1 mRNA, resulting in slow growth. Puf inactivation is not a result of altered expression or localization. Puf1p and Puf4p can bind target mRNA in inactivating conditions; however, Puf5p binding is reduced. This work demonstrates how multiple Puf proteins coordinately regulate YHB1 mRNA to protect cells from nitric oxide stress.
authors: Department of Biology, University of Missouri-St. Louis, St. Louis, MO 63121-4499.
authors: Joseph
authors: J
authors: Russo
authors: Department of Biology, University of Missouri-St. Louis, St. Louis, MO 63121-4499 olivasw@umsl.edu.
authors: Wendy M
authors: WM
authors: Olivas
mesh_terms: D020413:3' Untranslated Regions; D001483:Base Sequence; D001665:Binding Sites; D049308:Dioxygenases / Q000235:genetics / Q000378:metabolism*; D015870:Gene Expression; D015966:Gene Expression Regulation, Fungal; D006207:Half-Life; D006420:Hemeproteins / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D009569:Nitric Oxide / Q000502:physiology*; D020871:RNA Stability; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D016601:RNA-Binding Proteins / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*; D013312:Stress, Physiological
chemical_list: D020413:3' Untranslated Regions; D006420:Hemeproteins; C097438:JSN1 protein, S cerevisiae; C449502:MPT5 protein, S cerevisiae; C070592:PUF4 protein, S cerevisiae; D012333:RNA, Messenger; D016601:RNA-Binding Proteins; D029701:Saccharomyces cerevisiae Proteins; D009569:Nitric Oxide; D049308:Dioxygenases; C101796:YHB1 protein, S cerevisiae
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