A simple yeast-based system for analyzing inhibitor resistance in the human cancer drug targets Hsp90α/β

Millson, Stefan H., Prodromou, Chrisostomos and Piper, Peter W. (2010) A simple yeast-based system for analyzing inhibitor resistance in the human cancer drug targets Hsp90α/β. Biochemical Pharmacology, 79 . pp. 1581-1588. ISSN 0006-2952

Full content URL: http://dx.doi.org/10.1016/j.bcp.2010.01.031


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Heat shock protein 90 (Hsp90), a highly conserved molecular chaperone, is one of the most promising targets for cancer drug development. Whether any resistance to these Hsp90 inhibitor drugs could arise by Hsp90 mutation is still unknown. Yeast is readily engineered so that its essential Hsp90 function is provided by either isoform of the human cytosolic Hsp90, Hsp90α or Hsp90β. However, its high intrinsic resistance to most drugs poses a major obstacle to the use of such Hsp90α- or Hsp90β-expressing yeast cells as a model system to analyse whether drug resistance might arise by Hsp90 mutation. In order to overcome this problem, we have generated a strain that is both hypersensitive to Hsp90 inhibitors as it lacks multiple drug resistance genes, and in which different heterologous and mutant Hsp90s can be expressed by plasmid exchange. It is not rendered appreciably stress sensitive when made to express Hsp90α or Hsp90β as its sole form of Hsp90. Should there be any development of resistance to the Hsp90 drugs now in cancer clinic trials, this system can provide a rapid initial test of whether any single nucleotide polymorphism appearing within the coding regions of Hsp90α or Hsp90β could be a contributory factor in this resistance. We have used this strain to demonstrate that significant levels of resistance to the Hsp90 inhibitors radicicol and 17-allylamino-demethoxygeldanamycin (17-AAG) are generated as a result of the same single point mutation within the native Hsp90 of yeast (A107N), the human Hsp90α (A121N) and the human Hsp90β (A116N).

Keywords:Hsp90, Molecular chaperone, Cancer, Drug target, Drug resistance, Yeast, oaopen
Subjects:C Biological Sciences > C710 Applied Molecular Biology, Biophysics and Biochemistry
B Subjects allied to Medicine > B990 Subjects Allied to Medicine not elsewhere classified
C Biological Sciences > C700 Molecular Biology, Biophysics and Biochemistry
Divisions:College of Science > School of Life Sciences
ID Code:15319
Deposited On:04 Nov 2014 13:26

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