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• W2247201288 abstract "Molecular chaperones are a group of proteins which maintain cellular homeostasis by assisting de novo protein folding and their refolding to native state after destabilization due to external stress. They are also known as heat shock proteins as they were first discovered as a response to heat stress. It is now well established that the function of this group of proteins is not only restricted to protein homeostasis but also extends to diverse cellular processes such signal transduction, development and differentiation. Heat shock protein 90 (Hsp90) is one of the most abundant molecular chaperones that is highly conserved from prokaryotes to eukaryotes. Hsp90 is an essential chaperone and is required for the viability of all eukaryotes examined so far including yeast, Drosophila and Caenorhabditis elegans. Hsp90 has emerged as an important regulator of cellular activities by virtue of its ability to interact with a diverse set of client proteins many of which include transcription factors, protein kinases and signaling molecules. Through interaction with these proteins it is involved in regulating cellular processes including growth, cell cycle, endocrine functions, apoptosis, differentiation and development. Further in Drosophila and plants, Hsp90 is thought to function as a capacitor for morphological evolution and phenotypic variation. Recently, it has also been implicated in the emergence of drug resistance in Candida albicans. Furthermore, the importance of Hsp90 in disease states, particularly in cancer, is strongly evident, where chaperoning of mutated and oncogenic proteins is critical for continuous proliferation of cells. This has led to the development of Hsp90 inhibitors as an anti-cancer drug. Geldanamycin (GA), a benzoquinone ansamycin was the first molecule shown to inhibit Hsp90 activity by binding to its ATP binding domain. A derivative of GA, 17-allylamino-17-demethoxygeldanamycin (17AAG), has shown promise in clinical studies and has entered Phase III clinical trials. Hsp90 has been shown to be important for growth and development of many protozoan parasites. Inhibition of Hsp90 function in Leishmania, Emiera, Toxoplasma, Trypanosoma as well as Plasmodium causes a block in their developmental cycle. Previous studies from our laboratory have shown that inhibition of Hsp90 function prevents growth of malaria parasite in human erythrocytes in vitro. P. falciparum Hsp90 (PfHsp90) has also been shown to regulate parasite growth during the febrile episodes that are characteristic of malaria. While most of the studies highlighting the importance of PfHsp90 have relied on its pharmacological inhibition, its biochemical characterization and quantitative measurement of its interaction with GA in isolated system has not been explored. It was also not understood whether the in vitro model of Hsp90 inhibition could translate into inhibition of the parasite growth in an animal model of malaria. Since Hsp90 is a split ATPase requiring proper co-ordination between the residues on its N-terminal and middle…" @default.
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• W2247201288 date "2011-02-01" @default.
• W2247201288 modified "2023-09-23" @default.
• W2247201288 title "Biochemical Characterization Of Heat Shock Protein 90 From Plasmodium Falciparum" @default.
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