35
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Hsp70 Architecture: The Formation of Novel Polymeric Structures of Hsp70.1 and Hsc70 after Proteotoxic Stress

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Heat induces Hsp70.1 (HSPA1) and Hsc70 (HSPA8) to form complex detergent insoluble cytoplasmic and nuclear structures that are distinct from the cytoskeleton and internal cell membranes. These novel structures have not been observed by earlier immunofluorescence studies as they are obscured by the abundance of soluble Hsp70.1/Hsc70 present in cells. While resistant to detergents, these Hsp70 structures display complex intracellular dynamics and are efficiently disaggregated by ATP, indicating that this pool of Hsp70.1/Hsc70 retains native function and regulation. Hsp70.1 promotes the repair of proteotoxic damage and cell survival after stress. In heated fibroblasts expressing Hsp70.1, Hsp70.1 and Hsc70 complexes are efficiently disaggregated before the cells undergo-heat induced apoptosis. In the absence of Hsp70.1, fibroblasts have increased rates of heat-induced apoptosis and maintain stable insoluble Hsc70 structures. The differences in the intracellular distribution of Hsp70.1 and Hsc70, combined with the ability of Hsp70.1, but not Hsc70, to promote the disaggregation of insoluble Hsp70.1/Hsc70 complexes, indicate that these two closely related proteins perform distinctly different cellular functions in heated cells.

          Related collections

          Most cited references37

          • Record: found
          • Abstract: found
          • Article: not found

          Characteristics of a human cell line transformed by DNA from human adenovirus type 5.

          Human embryonic kidney cells have been transformed by exposing cells to sheared fragments of adenovirus type 5 DNA. The transformed cells (designated 293 cells) exhibited many of the characteristics of transformation including the elaboration of a virus-specific tumour antigen. Analysis of the polypeptides synthesized in the 293 cells by labelling with 35S-methionine and SDS PAGE showed a variable pattern of synthesis, different in a number of respects from that seen in otheruman cells. On labelling the surface of cells by lactoperoxidase catalysed radio-iodination, the absence of a labelled polypeptide analogous to the 250 K (LETS) glycoprotein was noted. Hybridization of labelled cellular RNA with restriction fragments of adenovirus type 5 DNA indicated transcription of a portion of the adenovirus genome at the conventional left hand end.
            Bookmark
            • Record: found
            • Abstract: not found
            • Article: not found
            Is Open Access

            The Hsp70 and Hsp60 chaperone machines.

              Bookmark
              • Record: found
              • Abstract: found
              • Article: not found

              RNA granules

              Cytoplasmic RNA granules in germ cells (polar and germinal granules), somatic cells (stress granules and processing bodies), and neurons (neuronal granules) have emerged as important players in the posttranscriptional regulation of gene expression. RNA granules contain various ribosomal subunits, translation factors, decay enzymes, helicases, scaffold proteins, and RNA-binding proteins, and they control the localization, stability, and translation of their RNA cargo. We review the relationship between different classes of these granules and discuss how spatial organization regulates messenger RNA translation/decay.
                Bookmark

                Author and article information

                Contributors
                Role: Editor
                Journal
                PLoS One
                PLoS ONE
                plos
                plosone
                PLoS ONE
                Public Library of Science (San Francisco, USA )
                1932-6203
                2012
                19 December 2012
                : 7
                : 12
                : e52351
                Affiliations
                [1 ]Peter MacCallum Cancer Centre, St Andrew’s Place, East Melbourne, Victoria, Australia
                [2 ]The Sir Peter MacCallum Department of Oncology, The University of Melbourne, Parkville, Victoria, Australia
                Boston University Medical School, United States of America
                Author notes

                Competing Interests: The authors have declared that no competing interests exist.

                Conceived and designed the experiments: RS RLA. Performed the experiments: RS RSC SLE. Analyzed the data: RS RSC SLE. Wrote the paper: RS RLA.

                Article
                PONE-D-12-05177
                10.1371/journal.pone.0052351
                3526589
                23285004
                86c0bb04-019c-4dda-979f-24df619c091a
                Copyright @ 2012

                This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

                History
                : 22 February 2012
                : 16 November 2012
                Page count
                Pages: 11
                Funding
                This project was supported by the National Institute of Health/National Cancer Institute Grant CA81421. RLA is supported by a fellowship from the National Breast Cancer Foundation (NBCF Australia). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
                Categories
                Research Article
                Biology
                Biochemistry
                Proteins
                Chaperone Proteins
                Cytoskeletal Proteins
                Structural Proteins
                Macromolecular Assemblies
                Biophysics
                Molecular Cell Biology
                Cellular Structures
                Cytoskeleton
                Cell Death
                Cellular Stress Responses

                Uncategorized
                Uncategorized

                Comments

                Comment on this article