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Thirunavukarasu D, Shi H. An RNA aptamer specific to Hsp70-ATP conformation inhibits its ATPase activity independent of Hsp40. Nucleic Acid Ther 2015; 25:103-12. [PMID: 25654640 DOI: 10.1089/nat.2014.0510] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The highly conserved and ubiquitous molecular chaperone heat shock protein 70 (Hsp70) plays a critical role in protein homeostasis (proteostasis). Controlled by its ATPase activity, Hsp70 cycles between two conformations, Hsp70-ATP and Hsp70-ADP, to bind and release its substrate. Chemical tools with distinct modes of action, especially those capable of modulating the ATPase activity of Hsp70, are being actively sought after in the mechanistic dissection of this system. Here, we report a conformation-specific RNA aptamer that binds only to Hsp70-ATP but not to Hsp70-ADP. We have refined this aptamer and demonstrated its inhibitory effect on Hsp70's ATPase activity. We have also shown that this inhibitory effect on Hsp70 is independent of its interaction with the Hsp40 co-chaperone. As Hsp70 is increasingly being recognized as a drug target in a number of age related diseases such as neurodegenerative, protein misfolding diseases and cancer, this aptamer is potentially useful in therapeutic applications. Moreover, this work also demonstrates the feasibility of using aptamers to target ATPase activity as a general therapeutic strategy.
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Affiliation(s)
- Deepak Thirunavukarasu
- Department of Biological Sciences and the RNA Institute, University at Albany, State University of New York , Albany, New York
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Hassan AQ, Kirby CA, Zhou W, Schuhmann T, Kityk R, Kipp DR, Baird J, Chen J, Chen Y, Chung F, Hoepfner D, Movva NR, Pagliarini R, Petersen F, Quinn C, Quinn D, Riedl R, Schmitt EK, Schitter A, Stams T, Studer C, Fortin PD, Mayer MP, Sadlish H. The novolactone natural product disrupts the allosteric regulation of Hsp70. ACTA ACUST UNITED AC 2014; 22:87-97. [PMID: 25544045 DOI: 10.1016/j.chembiol.2014.11.007] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Revised: 10/11/2014] [Accepted: 11/03/2014] [Indexed: 01/04/2023]
Abstract
The highly conserved 70 kDa heat shock proteins (Hsp70) play an integral role in proteostasis such that dysregulation has been implicated in numerous diseases. Elucidating the precise role of Hsp70 family members in the cellular context, however, has been hampered by the redundancy and intricate regulation of the chaperone network, and relatively few selective and potent tools. We have characterized a natural product, novolactone, that targets cytosolic and ER-localized isoforms of Hsp70 through a highly conserved covalent interaction at the interface between the substrate-binding and ATPase domains. Biochemical and structural analyses indicate that novolactone disrupts interdomain communication by allosterically inducing a conformational change in the Hsp70 protein to block ATP-induced substrate release and inhibit refolding activities. Thus, novolactone is a valuable tool for exploring the requirements of Hsp70 chaperones in diverse cellular contexts.
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Affiliation(s)
- A Quamrul Hassan
- Novartis Institutes for BioMedical Research, 250 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Christina A Kirby
- Novartis Institutes for BioMedical Research, 250 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Wenlai Zhou
- Novartis Institutes for BioMedical Research, 250 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Tim Schuhmann
- Novartis Institutes for BioMedical Research, Novartis Campus, 4056 Basel, Switzerland
| | - Roman Kityk
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), DKFZ-ZMBH Alliance, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - D Randal Kipp
- Novartis Institutes for BioMedical Research, 250 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Jason Baird
- Novartis Institutes for BioMedical Research, 250 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Jinyun Chen
- Novartis Institutes for BioMedical Research, 250 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Yaoyu Chen
- Novartis Institutes for BioMedical Research, 250 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Franklin Chung
- Novartis Institutes for BioMedical Research, 250 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Dominic Hoepfner
- Novartis Institutes for BioMedical Research, Novartis Campus, 4056 Basel, Switzerland
| | - N Rao Movva
- Novartis Institutes for BioMedical Research, Novartis Campus, 4056 Basel, Switzerland
| | - Raymond Pagliarini
- Novartis Institutes for BioMedical Research, 250 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Frank Petersen
- Novartis Institutes for BioMedical Research, Novartis Campus, 4056 Basel, Switzerland
| | - Christopher Quinn
- Novartis Institutes for BioMedical Research, 250 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Douglas Quinn
- Novartis Institutes for BioMedical Research, 250 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Ralph Riedl
- Novartis Institutes for BioMedical Research, Novartis Campus, 4056 Basel, Switzerland
| | - Esther K Schmitt
- Novartis Institutes for BioMedical Research, Novartis Campus, 4056 Basel, Switzerland
| | - Anne Schitter
- Novartis Institutes for BioMedical Research, Novartis Campus, 4056 Basel, Switzerland
| | - Travis Stams
- Novartis Institutes for BioMedical Research, 250 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Christian Studer
- Novartis Institutes for BioMedical Research, Novartis Campus, 4056 Basel, Switzerland
| | - Pascal D Fortin
- Novartis Institutes for BioMedical Research, 250 Massachusetts Avenue, Cambridge, MA 02139, USA
| | - Matthias P Mayer
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), DKFZ-ZMBH Alliance, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - Heather Sadlish
- Novartis Institutes for BioMedical Research, Novartis Campus, 4056 Basel, Switzerland.
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