4AXP
NMR structure of Hsp12, a protein induced by and required for dietary restriction-induced lifespan extension in yeast.
Summary for 4AXP
| Entry DOI | 10.2210/pdb4axp/pdb |
| NMR Information | BMRB: 18523 |
| Descriptor | 12 KDA HEAT SHOCK PROTEIN (1 entity in total) |
| Functional Keywords | cell adhesion, aging, longevity, proteomics |
| Biological source | SACCHAROMYCES CEREVISIAE (BAKER'S YEAST) |
| Total number of polymer chains | 1 |
| Total formula weight | 11712.73 |
| Authors | Herbert, A.P.,Riesen, M.,Bloxam, L.,Kosmidou, E.,Wareing, B.M.,Johnson, J.R.,Phelan, M.M.,Pennington, S.R.,Lian, L.Y.,Morgan, A. (deposition date: 2012-06-13, release date: 2012-08-08, Last modification date: 2024-05-15) |
| Primary citation | Herbert, A.P.,Riesen, M.,Bloxam, L.,Kosmidou, E.,Wareing, B.M.,Johnson, J.R.,Phelan, M.M.,Pennington, S.R.,Lian, L.Y.,Morgan, A. NMR Structure of Hsp12, a Protein Induced by and Required for Dietary Restriction-Induced Lifespan Extension in Yeast. Plos One, 7:41975-, 2012 Cited by PubMed Abstract: Dietary restriction (DR) extends lifespan in yeast, worms, flies and mammals, suggesting that it may act via conserved processes. However, the downstream mechanisms by which DR increases lifespan remain unclear. We used a gel based proteomic strategy to identify proteins whose expression was induced by DR in yeast and thus may correlate with longevity. One protein up-regulated by DR was Hsp12, a small heat shock protein induced by various manipulations known to retard ageing. Lifespan extension by growth on 0.5% glucose (DR) was abolished in an hsp12Δ strain, indicating that Hsp12 is essential for the longevity effect of DR. In contrast, deletion of HSP12 had no effect on growth under DR conditions or a variety of environmental stresses, indicating that the effect of Hsp12 on lifespan is not due to increased general stress resistance. Unlike other small heat shock proteins, recombinant Hsp12 displayed negligible in vitro molecular chaperone activity, suggesting that its cellular function does not involve preventing protein aggregation. NMR analysis indicated that Hsp12 is monomeric and intrinsically unfolded in solution, but switches to a 4-helical conformation upon binding to membrane-mimetic SDS micelles. The structure of micelle-bound Hsp12 reported here is consistent with its recently proposed function as a membrane-stabilising 'lipid chaperone'. Taken together, our data suggest that DR-induced Hsp12 expression contributes to lifespan extension, possibly via membrane alterations. PubMed: 22848679DOI: 10.1371/JOURNAL.PONE.0041975 PDB entries with the same primary citation |
| Experimental method | SOLUTION NMR |
Structure validation
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