title: A conserved domain important for association of eukaryotic J-protein co-chaperones Jjj1 and Zuo1 with the ribosome.
abstract: J-proteins, obligate co-chaperones, provide specialization for Hsp70 function in a variety of cellular processes. Two of the 13 J-proteins of the yeast cytosol/nucleus, Zuo1 and Jjj1, are associated with 60S ribosomal subunits. Abundant Zuo1 facilitates folding of nascent polypeptides; Jjj1, of much lower abundance, functions in ribosome biogenesis. However, overexpression of Jjj1 substantially rescues growth defects of cells lacking Zuo1. We analyzed a region held in common by Zuo1 and Jjj1, outside the signature J-domain found in all J-proteins. This shared "zuotin homology domain" (ZHD) is important for ribosome association of both proteins. An N-terminal segment of Jjj1, containing the J-domain and ZHD, is ribosome-associated and, like full-length Jjj1, is competent to rescue both the cold- and cation-sensitivity of ∆zuo1. However, this fragment, when expressed at normal levels, cannot rescue the cytosolic ribosome biogenesis defect of ∆jjj1. Our results are consistent with a model in which the primary functions of Zuo1 and Jjj1 occur in the cytosol. In addition, our data suggest that Zuo1 and Jjj1 bind overlapping sites on ribosomes due to an interaction via their common ZHDs, but Jjj1 binds primarily to pre-60S particles and Zuo1 to mature subunits. We hypothesize that ZUO1 and JJJ1, which are conserved throughout eukaryotes, arose from an ancient duplication of a progenitor J-protein gene that encoded the ZHD ribosome-binding region; subsequently, specialized roles and additional ribosome interaction sites evolved.
authors: Graduate Program in Cellular and Molecular Biology, University of Wisconsin-Madison, USA; Department of Biochemistry, University of Wisconsin-Madison, USA.
authors: Lindsey A
authors: LA
authors: Kaschner
authors: Department of Biochemistry, University of Wisconsin-Madison, USA.
authors: Ruchika
authors: R
authors: Sharma
authors: Department of Biochemistry, University of Wisconsin-Madison, USA.
authors: Om Kumar
authors: OK
authors: Shrestha
authors: Department of Biochemistry, University of Wisconsin-Madison, USA.
authors: Alison E
authors: AE
authors: Meyer
authors: Department of Biochemistry, University of Wisconsin-Madison, USA. Electronic address: ecraig@wisc.edu.
authors: Elizabeth A
authors: EA
authors: Craig
mesh_terms: D000595:Amino Acid Sequence; D001120:Arginine / Q000378:metabolism; D017124:Conserved Sequence; D050956:HSP40 Heat-Shock Proteins / Q000737:chemistry / Q000378:metabolism*; D018832:Molecular Chaperones / Q000737:chemistry / Q000378:metabolism*; D008969:Molecular Sequence Data; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D054683:Ribosome Subunits, Large, Eukaryotic; D012270:Ribosomes / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry / Q000378:metabolism*; D013329:Structure-Activity Relationship
chemical_list: C546625:Arx1 protein, S cerevisiae; D050956:HSP40 Heat-Shock Proteins; C517792:Jjj1 protein, S cerevisiae; D018832:Molecular Chaperones; D029701:Saccharomyces cerevisiae Proteins; C077019:ZUO1 protein, S cerevisiae; D001120:Arginine
keywords: Hsp70; J-protein; Molecular chaperone; Ribosome association; Ribosome biogenesis
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